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diff --git a/cuesonnet_decode_test.go b/cuesonnet_decode_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..366847898f4e14f0d6c1db60c0f6cf72254f462e
--- /dev/null
+++ b/cuesonnet_decode_test.go
@@ -0,0 +1,618 @@
+package cuesonnet_test
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+
+	"go.jolheiser.com/cuesonnet"
+)
+
+// checkDecode decodes data into T via sc and compares with expected using reflect.DeepEqual.
+func checkDecode[T any](t *testing.T, sc cuesonnet.Schema, data string, expected T) {
+	t.Helper()
+	var got T
+	if err := sc.Decode(strings.NewReader(data), &got); err != nil {
+		t.Fatalf("decode error: %v", err)
+	}
+	if !reflect.DeepEqual(got, expected) {
+		t.Errorf("value mismatch:\n  got:  %+v\n  want: %+v", got, expected)
+	}
+}
+
+// decode wraps checkDecode into a check func for use in table-driven tests.
+func decode[T any](expected T) func(*testing.T, cuesonnet.Schema, string) {
+	return func(t *testing.T, sc cuesonnet.Schema, data string) {
+		t.Helper()
+		checkDecode(t, sc, data, expected)
+	}
+}
+
+type (
+	PersonDecode struct {
+		FirstName string `json:"firstName"`
+		LastName  string `json:"lastName"`
+		Age       int    `json:"age"`
+		Birthday  string `json:"birthday"`
+		Gopher    bool   `json:"gopher"`
+	}
+
+	PrimitivesDecode struct {
+		Str  string  `json:"str"`
+		Num  int     `json:"num"`
+		Dec  float64 `json:"dec"`
+		Flag bool    `json:"flag"`
+		Qty  float64 `json:"qty"`
+	}
+
+	ConstraintsDecode struct {
+		Age      int     `json:"age"`
+		Score    float64 `json:"score"`
+		Username string  `json:"username"`
+		Bio      string  `json:"bio"`
+		Level    int     `json:"level"`
+		Slug     string  `json:"slug"`
+	}
+
+	// Metadata and Annotations are _ in CUE; decoded type depends on the data.
+	AnyDecode struct {
+		Name        string `json:"name"`
+		Metadata    any    `json:"metadata"`
+		Annotations any    `json:"annotations,omitempty"`
+	}
+
+	ClosedDecode struct {
+		Name string `json:"name"`
+		Age  int    `json:"age"`
+	}
+
+	OptionalDecode struct {
+		Name  string `json:"name"`
+		Email string `json:"email"`
+		Phone string `json:"phone,omitempty"`
+		Bio   string `json:"bio,omitempty"`
+	}
+
+	AddressDecode struct {
+		Street string `json:"street"`
+		City   string `json:"city"`
+		Zip    string `json:"zip"`
+	}
+	ContactDecode struct {
+		Label string `json:"label"`
+		Value string `json:"value"`
+	}
+	NestedDecode struct {
+		Name     string          `json:"name"`
+		Address  AddressDecode   `json:"address"`
+		Contacts []ContactDecode `json:"contacts"`
+	}
+
+	ListItemDecode struct {
+		ID    int    `json:"id"`
+		Label string `json:"label"`
+	}
+	ListsDecode struct {
+		Items   []ListItemDecode `json:"items"`
+		Tags    []string         `json:"tags"`
+		Counts  []int            `json:"counts"`
+		Limited []string         `json:"limited"`
+	}
+
+	// Value and Nullable are disjunction types; any holds the concrete runtime value.
+	DisjunctionsDecode struct {
+		Value    any    `json:"value"`
+		Mode     string `json:"mode"`
+		Priority int    `json:"priority"`
+		Nullable any    `json:"nullable"`
+	}
+
+	DefaultsDecode struct {
+		Name    string   `json:"name"`
+		Role    string   `json:"role"`
+		Enabled bool     `json:"enabled"`
+		Timeout int      `json:"timeout"`
+		Tags    []string `json:"tags"`
+	}
+
+	EnumsDecode struct {
+		Color    string   `json:"color"`
+		Status   string   `json:"status"`
+		Priority int      `json:"priority"`
+		Flags    []string `json:"flags"`
+	}
+
+	DefNameDecode struct {
+		First string `json:"first"`
+		Last  string `json:"last"`
+	}
+	DefContactDecode struct {
+		Email string `json:"email,omitempty"`
+		Phone string `json:"phone,omitempty"`
+	}
+	DefPersonDecode struct {
+		Name    DefNameDecode    `json:"name"`
+		Age     int              `json:"age"`
+		Contact DefContactDecode `json:"contact"`
+	}
+
+	StdlibDecode struct {
+		CreatedAt string   `json:"createdAt"`
+		Birthday  string   `json:"birthday"`
+		Username  string   `json:"username"`
+		Tags      []string `json:"tags"`
+		Initials  string   `json:"initials"`
+		Angle     float64  `json:"angle"`
+	}
+
+	CompositionDecode struct {
+		FirstName string `json:"firstName"`
+		LastName  string `json:"lastName"`
+		CreatedAt string `json:"createdAt"`
+		UpdatedAt string `json:"updatedAt"`
+		Age       int    `json:"age"`
+	}
+
+	PatternsDecode struct {
+		Name   string            `json:"name"`
+		Labels map[string]string `json:"labels"`
+		Counts map[string]int    `json:"counts"`
+	}
+
+	// CUE fixed-length tuples decode positionally; Tag is [string, int] so []any.
+	TuplesDecode struct {
+		Color    []int     `json:"color"`
+		Position []float64 `json:"position"`
+		Tag      []any     `json:"tag"`
+	}
+
+	FunctionUserDecode struct {
+		Name     string `json:"name"`
+		Greeting string `json:"greeting"`
+		Age      int    `json:"age"`
+	}
+
+	ComprehensionItemDecode struct {
+		Index   int    `json:"index"`
+		Squared int    `json:"squared"`
+		Label   string `json:"label"`
+	}
+
+	ConditionalEntryDecode struct {
+		Value    int    `json:"value"`
+		Category string `json:"category"`
+		Doubled  int    `json:"doubled"`
+	}
+
+	InheritanceDecode struct {
+		Kind     string `json:"kind"`
+		Version  string `json:"version"`
+		Name     string `json:"name"`
+		Replicas int    `json:"replicas"`
+		Image    string `json:"image"`
+	}
+
+	MultilineDecode struct {
+		Description string `json:"description"`
+		Template    string `json:"template"`
+	}
+
+	SelfRefDecode struct {
+		Width     int `json:"width"`
+		Height    int `json:"height"`
+		Area      int `json:"area"`
+		Perimeter int `json:"perimeter"`
+	}
+
+	JStdlibDecode struct {
+		Upper     string   `json:"upper"`
+		Joined    string   `json:"joined"`
+		Formatted string   `json:"formatted"`
+		Count     int      `json:"count"`
+		Words     []string `json:"words"`
+		Mapped    []string `json:"mapped"`
+		Filtered  []string `json:"filtered"`
+	}
+)
+
+func TestCUEsonnetDecode(t *testing.T) {
+	type decodeTest struct {
+		name   string
+		schema string
+		data   string
+		check  func(*testing.T, cuesonnet.Schema, string)
+	}
+
+	jim := PersonDecode{
+		FirstName: "Jim",
+		LastName:  "Jimbly",
+		Age:       45,
+		Birthday:  "01/02/2003",
+		Gopher:    true,
+	}
+
+	tests := []decodeTest{
+		// person
+		{
+			name:   "person/valid",
+			schema: "testdata/person/schema.cue",
+			data:   "testdata/person/valid.jsonnet",
+			check:  decode(jim),
+		},
+		{
+			name:   "person/functions",
+			schema: "testdata/person/schema.cue",
+			data:   "testdata/person/functions.jsonnet",
+			check:  decode(jim),
+		},
+		{
+			name:   "person/list",
+			schema: "testdata/person/schema_list.cue",
+			data:   "testdata/person/functions_list.jsonnet",
+			check:  decode([]PersonDecode{jim}),
+		},
+
+		// primitives
+		{
+			name:   "primitives/valid",
+			schema: "testdata/primitives/schema.cue",
+			data:   "testdata/primitives/valid.jsonnet",
+			check:  decode(PrimitivesDecode{Str: "hello", Num: 42, Dec: 3.14, Flag: true, Qty: 2.718}),
+		},
+
+		// constraints
+		{
+			name:   "constraints/valid",
+			schema: "testdata/constraints/schema.cue",
+			data:   "testdata/constraints/valid.jsonnet",
+			check:  decode(ConstraintsDecode{Age: 30, Score: 95.5, Username: "john_doe", Bio: "A software engineer.", Level: 5, Slug: "my-slug"}),
+		},
+
+		// structs/any
+		// valid_scalar: metadata is a plain string — no type ambiguity.
+		{
+			name:   "structs/any/valid_scalar",
+			schema: "testdata/structs/any/schema.cue",
+			data:   "testdata/structs/any/valid_scalar.jsonnet",
+			check:  decode(AnyDecode{Name: "Alice", Metadata: "just a plain string"}),
+		},
+		// valid_object: metadata is a JSON object; CUE decodes it to map[string]any.
+		{
+			name:   "structs/any/valid_object",
+			schema: "testdata/structs/any/schema.cue",
+			data:   "testdata/structs/any/valid_object.jsonnet",
+			check: func(t *testing.T, sc cuesonnet.Schema, data string) {
+				t.Helper()
+				var got AnyDecode
+				if err := sc.Decode(strings.NewReader(data), &got); err != nil {
+					t.Fatalf("decode error: %v", err)
+				}
+				if got.Name != "Alice" {
+					t.Errorf("Name: got %q, want %q", got.Name, "Alice")
+				}
+				meta, ok := got.Metadata.(map[string]any)
+				if !ok {
+					t.Fatalf("Metadata: got %T, want map[string]any", got.Metadata)
+				}
+				if meta["role"] != "admin" {
+					t.Errorf("Metadata.role: got %v, want %q", meta["role"], "admin")
+				}
+				if _, ok := got.Annotations.(map[string]any); !ok {
+					t.Errorf("Annotations: got %T, want map[string]any", got.Annotations)
+				}
+			},
+		},
+
+		// structs/closed
+		{
+			name:   "structs/closed/valid",
+			schema: "testdata/structs/closed/schema.cue",
+			data:   "testdata/structs/closed/valid.jsonnet",
+			check:  decode(ClosedDecode{Name: "Alice", Age: 30}),
+		},
+
+		// structs/optional
+		{
+			name:   "structs/optional/full",
+			schema: "testdata/structs/optional/schema.cue",
+			data:   "testdata/structs/optional/valid_full.jsonnet",
+			check:  decode(OptionalDecode{Name: "Alice", Email: "alice@example.com", Phone: "555-1234", Bio: "Software engineer."}),
+		},
+		{
+			name:   "structs/optional/minimal",
+			schema: "testdata/structs/optional/schema.cue",
+			data:   "testdata/structs/optional/valid_minimal.jsonnet",
+			check:  decode(OptionalDecode{Name: "Alice", Email: "alice@example.com"}),
+		},
+
+		// structs/nested
+		{
+			name:   "structs/nested/valid",
+			schema: "testdata/structs/nested/schema.cue",
+			data:   "testdata/structs/nested/valid.jsonnet",
+			check: decode(NestedDecode{
+				Name:    "Alice",
+				Address: AddressDecode{Street: "123 Main St", City: "Springfield", Zip: "12345"},
+				Contacts: []ContactDecode{
+					{Label: "email", Value: "alice@example.com"},
+					{Label: "phone", Value: "555-1234"},
+				},
+			}),
+		},
+
+		// lists
+		{
+			name:   "lists/valid",
+			schema: "testdata/lists/schema.cue",
+			data:   "testdata/lists/valid.jsonnet",
+			check: decode(ListsDecode{
+				Items:   []ListItemDecode{{ID: 1, Label: "first"}, {ID: 2, Label: "second"}},
+				Tags:    []string{"go", "cue", "jsonnet"},
+				Counts:  []int{0, 1, 2, 100},
+				Limited: []string{"only", "a", "few"},
+			}),
+		},
+
+		// disjunctions
+		// valid_a: all any fields hold strings — no type ambiguity.
+		{
+			name:   "disjunctions/valid_a",
+			schema: "testdata/disjunctions/schema.cue",
+			data:   "testdata/disjunctions/valid_a.jsonnet",
+			check:  decode(DisjunctionsDecode{Value: "text", Mode: "read", Priority: 1, Nullable: "present"}),
+		},
+		// valid_b: Value is an integer and Nullable is null.
+		// CUE decodes integers into any as int64; null becomes nil.
+		{
+			name:   "disjunctions/valid_b",
+			schema: "testdata/disjunctions/schema.cue",
+			data:   "testdata/disjunctions/valid_b.jsonnet",
+			check: func(t *testing.T, sc cuesonnet.Schema, data string) {
+				t.Helper()
+				var got DisjunctionsDecode
+				if err := sc.Decode(strings.NewReader(data), &got); err != nil {
+					t.Fatalf("decode error: %v", err)
+				}
+				if got.Mode != "write" {
+					t.Errorf("Mode: got %q, want %q", got.Mode, "write")
+				}
+				if got.Priority != 3 {
+					t.Errorf("Priority: got %d, want 3", got.Priority)
+				}
+				if got.Nullable != nil {
+					t.Errorf("Nullable: got %v, want nil", got.Nullable)
+				}
+				switch v := got.Value.(type) {
+				case int64:
+					if v != 42 {
+						t.Errorf("Value: got %d, want 42", v)
+					}
+				case float64:
+					if v != 42 {
+						t.Errorf("Value: got %g, want 42", v)
+					}
+				default:
+					t.Errorf("Value: unexpected type %T (value %v)", got.Value, got.Value)
+				}
+			},
+		},
+
+		// defaults
+		// minimal: only name provided; CUE fills role="user", enabled=true, timeout=30, tags=[].
+		{
+			name:   "defaults/minimal",
+			schema: "testdata/defaults/schema.cue",
+			data:   "testdata/defaults/valid_minimal.jsonnet",
+			check:  decode(DefaultsDecode{Name: "Alice", Role: "user", Enabled: true, Timeout: 30, Tags: []string{}}),
+		},
+		{
+			name:   "defaults/override",
+			schema: "testdata/defaults/schema.cue",
+			data:   "testdata/defaults/valid_override.jsonnet",
+			check:  decode(DefaultsDecode{Name: "Alice", Role: "admin", Enabled: false, Timeout: 60, Tags: []string{"api", "v2"}}),
+		},
+
+		// enums
+		{
+			name:   "enums/valid",
+			schema: "testdata/enums/schema.cue",
+			data:   "testdata/enums/valid.jsonnet",
+			check:  decode(EnumsDecode{Color: "red", Status: "active", Priority: 3, Flags: []string{"a", "b"}}),
+		},
+
+		// definitions
+		{
+			name:   "definitions/valid",
+			schema: "testdata/definitions/schema.cue",
+			data:   "testdata/definitions/valid.jsonnet",
+			check: decode([]DefPersonDecode{
+				{Name: DefNameDecode{First: "Alice", Last: "Smith"}, Age: 30, Contact: DefContactDecode{Email: "alice@example.com"}},
+				{Name: DefNameDecode{First: "Bob", Last: "Jones"}, Age: 25, Contact: DefContactDecode{Phone: "555-123-4567"}},
+				{Name: DefNameDecode{First: "Carol", Last: "White"}, Age: 42, Contact: DefContactDecode{Email: "carol@example.com", Phone: "123-456-7890"}},
+			}),
+		},
+
+		// stdlib
+		{
+			name:   "stdlib/valid",
+			schema: "testdata/stdlib/schema.cue",
+			data:   "testdata/stdlib/valid.jsonnet",
+			check: decode(StdlibDecode{
+				CreatedAt: "2024-01-15T10:30:00Z",
+				Birthday:  "01/15/1990",
+				Username:  "alice42",
+				Tags:      []string{"go", "cue", "jsonnet"},
+				Initials:  "AB",
+				Angle:     3.14,
+			}),
+		},
+
+		// composition
+		{
+			name:   "composition/valid",
+			schema: "testdata/composition/schema.cue",
+			data:   "testdata/composition/valid.jsonnet",
+			check: decode([]CompositionDecode{
+				{FirstName: "Alice", LastName: "Smith", CreatedAt: "2024-01-15T10:00:00Z", UpdatedAt: "2024-06-01T12:00:00Z", Age: 30},
+				{FirstName: "Bob", LastName: "Jones", CreatedAt: "2023-05-20T08:30:00Z", UpdatedAt: "2023-05-20T08:30:00Z", Age: 25},
+			}),
+		},
+
+		// patterns
+		{
+			name:   "patterns/valid",
+			schema: "testdata/patterns/schema.cue",
+			data:   "testdata/patterns/valid.jsonnet",
+			check: decode(PatternsDecode{
+				Name: "service-a",
+				Labels: map[string]string{
+					"env":    "production",
+					"region": "us-east-1",
+					"team":   "platform",
+				},
+				Counts: map[string]int{
+					"requests": 1000,
+					"errors":   5,
+					"warnings": 42,
+				},
+			}),
+		},
+
+		// tuples
+		// Color and Position are uniformly typed; Tag is [string, int] so []any.
+		// The int element decodes as int64 or float64 depending on CUE version.
+		{
+			name:   "tuples/valid",
+			schema: "testdata/tuples/schema.cue",
+			data:   "testdata/tuples/valid.jsonnet",
+			check: func(t *testing.T, sc cuesonnet.Schema, data string) {
+				t.Helper()
+				var got TuplesDecode
+				if err := sc.Decode(strings.NewReader(data), &got); err != nil {
+					t.Fatalf("decode error: %v", err)
+				}
+				if !reflect.DeepEqual(got.Color, []int{255, 128, 0}) {
+					t.Errorf("Color: got %v, want [255 128 0]", got.Color)
+				}
+				if !reflect.DeepEqual(got.Position, []float64{1.5, 2.7}) {
+					t.Errorf("Position: got %v, want [1.5 2.7]", got.Position)
+				}
+				if len(got.Tag) != 2 {
+					t.Fatalf("Tag: got len %d, want 2", len(got.Tag))
+				}
+				if got.Tag[0] != "priority" {
+					t.Errorf("Tag[0]: got %v, want %q", got.Tag[0], "priority")
+				}
+				switch v := got.Tag[1].(type) {
+				case int64:
+					if v != 1 {
+						t.Errorf("Tag[1]: got %d, want 1", v)
+					}
+				case float64:
+					if v != 1 {
+						t.Errorf("Tag[1]: got %g, want 1", v)
+					}
+				default:
+					t.Errorf("Tag[1]: unexpected type %T (value %v)", got.Tag[1], got.Tag[1])
+				}
+			},
+		},
+
+		// jsonnet/functions
+		{
+			name:   "jsonnet/functions",
+			schema: "testdata/jsonnet/functions/schema.cue",
+			data:   "testdata/jsonnet/functions/data.jsonnet",
+			check: decode([]FunctionUserDecode{
+				{Name: "Alice", Greeting: "Hello, Alice!", Age: 30},
+				{Name: "Bob", Greeting: "Hello, Bob!", Age: 25},
+				{Name: "Carol", Greeting: "Hello, Carol!", Age: 35},
+			}),
+		},
+
+		// jsonnet/comprehensions
+		{
+			name:   "jsonnet/comprehensions",
+			schema: "testdata/jsonnet/comprehensions/schema.cue",
+			data:   "testdata/jsonnet/comprehensions/data.jsonnet",
+			check: decode([]ComprehensionItemDecode{
+				{Index: 0, Squared: 1, Label: "item-1"},
+				{Index: 1, Squared: 4, Label: "item-2"},
+				{Index: 2, Squared: 9, Label: "item-3"},
+				{Index: 3, Squared: 16, Label: "item-4"},
+				{Index: 4, Squared: 25, Label: "item-5"},
+			}),
+		},
+
+		// jsonnet/conditionals
+		{
+			name:   "jsonnet/conditionals",
+			schema: "testdata/jsonnet/conditionals/schema.cue",
+			data:   "testdata/jsonnet/conditionals/data.jsonnet",
+			check: decode([]ConditionalEntryDecode{
+				{Value: 3, Category: "small", Doubled: 6},
+				{Value: 42, Category: "medium", Doubled: 84},
+				{Value: 150, Category: "large", Doubled: 300},
+			}),
+		},
+
+		// jsonnet/inheritance
+		{
+			name:   "jsonnet/inheritance",
+			schema: "testdata/jsonnet/inheritance/schema.cue",
+			data:   "testdata/jsonnet/inheritance/data.jsonnet",
+			check:  decode(InheritanceDecode{Kind: "Deployment", Version: "v1", Name: "my-app", Replicas: 3, Image: "myapp:latest"}),
+		},
+
+		// jsonnet/multiline
+		{
+			name:   "jsonnet/multiline",
+			schema: "testdata/jsonnet/multiline/schema.cue",
+			data:   "testdata/jsonnet/multiline/data.jsonnet",
+			check: decode(MultilineDecode{
+				Description: "This is a multi-line\nstring in Jsonnet.\nIt supports indentation.\n",
+				Template:    "Name: my-app\nVersion: v1.0\n",
+			}),
+		},
+
+		// jsonnet/self_reference
+		{
+			name:   "jsonnet/self_reference",
+			schema: "testdata/jsonnet/self_reference/schema.cue",
+			data:   "testdata/jsonnet/self_reference/data.jsonnet",
+			check:  decode(SelfRefDecode{Width: 10, Height: 20, Area: 200, Perimeter: 60}),
+		},
+
+		// jsonnet/object_comprehension
+		// Schema is [string]: int; decode directly into map[string]int.
+		{
+			name:   "jsonnet/object_comprehension",
+			schema: "testdata/jsonnet/object_comprehension/schema.cue",
+			data:   "testdata/jsonnet/object_comprehension/data.jsonnet",
+			check:  decode(map[string]int{"alice_score": 95, "bob_score": 87, "carol_score": 92}),
+		},
+
+		// jsonnet/stdlib
+		{
+			name:   "jsonnet/stdlib",
+			schema: "testdata/jsonnet/stdlib/schema.cue",
+			data:   "testdata/jsonnet/stdlib/data.jsonnet",
+			check: decode(JStdlibDecode{
+				Upper:     "HELLO",
+				Joined:    "hello, world, jsonnet",
+				Formatted: "count=3, first=hello",
+				Count:     3,
+				Words:     []string{"hello", "world", "jsonnet"},
+				Mapped:    []string{"HELLO", "WORLD", "JSONNET"},
+				Filtered:  []string{"jsonnet"},
+			}),
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			tc.check(t, cuesonnet.Schema(mustReadFile(t, tc.schema)), mustReadFile(t, tc.data))
+		})
+	}
+}

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diff --git a/cuesonnet_test.go b/cuesonnet_test.go
index 8f52a14d70c2e021ca7763fc7ada029882651bb9..9c835d68e45956b24236d2e0d452a01771dce5dc 100644
--- a/cuesonnet_test.go
+++ b/cuesonnet_test.go
@@ -1,105 +1,363 @@
 package cuesonnet_test
 
 import (
-	_ "embed"
+	"os"
 	"strings"
 	"testing"
 
 	"go.jolheiser.com/cuesonnet"
 )
 
-var (
-	//go:embed testdata/schema.cue
-	schema cuesonnet.Schema
-	//go:embed testdata/schema_list.cue
-	schemaList cuesonnet.Schema
-	//go:embed testdata/config.jsonnet
-	config string
-	//go:embed testdata/almost-fixed.jsonnet
-	almostFixed string
-	//go:embed testdata/fixed.jsonnet
-	fixed string
-	//go:embed testdata/kitchen.jsonnet
-	kitchen string
-	//go:embed testdata/kitchen_list.jsonnet
-	kitchenList string
-)
+type testCase struct {
+	name        string
+	schema      string
+	data        string
+	wantErr     bool
+	errContains []string
+}
 
-type Schema struct {
-	FirstName string `json:"firstName"`
-	LastName  string `json:"lastName"`
-	Age       int    `json:"age"`
-	Birthday  string `json:"birthday"`
-	Gopher    bool   `json:"gopher"`
+var cases = []testCase{
+	// person
+	{
+		name:        "person/invalid",
+		schema:      "testdata/person/schema.cue",
+		data:        "testdata/person/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"firstName", "age"},
+	},
+	{
+		name:        "person/almost_valid",
+		schema:      "testdata/person/schema.cue",
+		data:        "testdata/person/almost_valid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"LastName"},
+	},
+	{
+		name:   "person/valid",
+		schema: "testdata/person/schema.cue",
+		data:   "testdata/person/valid.jsonnet",
+	},
+	{
+		name:   "person/functions",
+		schema: "testdata/person/schema.cue",
+		data:   "testdata/person/functions.jsonnet",
+	},
+	{
+		name:   "person/list",
+		schema: "testdata/person/schema_list.cue",
+		data:   "testdata/person/functions_list.jsonnet",
+	},
+
+	// primitives
+	{
+		name:   "primitives/valid",
+		schema: "testdata/primitives/schema.cue",
+		data:   "testdata/primitives/valid.jsonnet",
+	},
+	{
+		name:        "primitives/invalid",
+		schema:      "testdata/primitives/schema.cue",
+		data:        "testdata/primitives/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"str", "num", "dec", "flag", "qty"},
+	},
+
+	// constraints
+	{
+		name:   "constraints/valid",
+		schema: "testdata/constraints/schema.cue",
+		data:   "testdata/constraints/valid.jsonnet",
+	},
+	{
+		name:        "constraints/invalid_range",
+		schema:      "testdata/constraints/schema.cue",
+		data:        "testdata/constraints/invalid_range.jsonnet",
+		wantErr:     true,
+		errContains: []string{"age", "score", "level"},
+	},
+	{
+		name:        "constraints/invalid_pattern",
+		schema:      "testdata/constraints/schema.cue",
+		data:        "testdata/constraints/invalid_pattern.jsonnet",
+		wantErr:     true,
+		errContains: []string{"username", "bio", "slug"},
+	},
+
+	// structs/any
+	{
+		name:   "structs/any/valid_object",
+		schema: "testdata/structs/any/schema.cue",
+		data:   "testdata/structs/any/valid_object.jsonnet",
+	},
+	{
+		name:   "structs/any/valid_scalar",
+		schema: "testdata/structs/any/schema.cue",
+		data:   "testdata/structs/any/valid_scalar.jsonnet",
+	},
+	{
+		name:        "structs/any/invalid",
+		schema:      "testdata/structs/any/schema.cue",
+		data:        "testdata/structs/any/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"name"},
+	},
+
+	// structs/closed
+	{
+		name:   "structs/closed/valid",
+		schema: "testdata/structs/closed/schema.cue",
+		data:   "testdata/structs/closed/valid.jsonnet",
+	},
+	{
+		name:        "structs/closed/invalid",
+		schema:      "testdata/structs/closed/schema.cue",
+		data:        "testdata/structs/closed/invalid_extra.jsonnet",
+		wantErr:     true,
+		errContains: []string{"email"},
+	},
+
+	// structs/optional
+	{
+		name:   "structs/optional/full",
+		schema: "testdata/structs/optional/schema.cue",
+		data:   "testdata/structs/optional/valid_full.jsonnet",
+	},
+	{
+		name:   "structs/optional/minimal",
+		schema: "testdata/structs/optional/schema.cue",
+		data:   "testdata/structs/optional/valid_minimal.jsonnet",
+	},
+	{
+		name:        "structs/optional/invalid",
+		schema:      "testdata/structs/optional/schema.cue",
+		data:        "testdata/structs/optional/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"email"},
+	},
+
+	// structs/nested
+	{
+		name:   "structs/nested/valid",
+		schema: "testdata/structs/nested/schema.cue",
+		data:   "testdata/structs/nested/valid.jsonnet",
+	},
+	{
+		name:        "structs/nested/invalid",
+		schema:      "testdata/structs/nested/schema.cue",
+		data:        "testdata/structs/nested/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"zip", "value"},
+	},
+
+	// lists
+	{
+		name:   "lists/valid",
+		schema: "testdata/lists/schema.cue",
+		data:   "testdata/lists/valid.jsonnet",
+	},
+	{
+		name:        "lists/invalid_element",
+		schema:      "testdata/lists/schema.cue",
+		data:        "testdata/lists/invalid_element.jsonnet",
+		wantErr:     true,
+		errContains: []string{"id", "label"},
+	},
+	{
+		name:        "lists/invalid_length",
+		schema:      "testdata/lists/schema.cue",
+		data:        "testdata/lists/invalid_length.jsonnet",
+		wantErr:     true,
+		errContains: []string{"limited"},
+	},
+
+	// disjunctions
+	{
+		name:   "disjunctions/valid_a",
+		schema: "testdata/disjunctions/schema.cue",
+		data:   "testdata/disjunctions/valid_a.jsonnet",
+	},
+	{
+		name:   "disjunctions/valid_b",
+		schema: "testdata/disjunctions/schema.cue",
+		data:   "testdata/disjunctions/valid_b.jsonnet",
+	},
+	{
+		name:        "disjunctions/invalid",
+		schema:      "testdata/disjunctions/schema.cue",
+		data:        "testdata/disjunctions/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"mode", "priority"},
+	},
+
+	// defaults
+	{
+		name:   "defaults/minimal",
+		schema: "testdata/defaults/schema.cue",
+		data:   "testdata/defaults/valid_minimal.jsonnet",
+	},
+	{
+		name:   "defaults/override",
+		schema: "testdata/defaults/schema.cue",
+		data:   "testdata/defaults/valid_override.jsonnet",
+	},
+
+	// enums
+	{
+		name:   "enums/valid",
+		schema: "testdata/enums/schema.cue",
+		data:   "testdata/enums/valid.jsonnet",
+	},
+	{
+		name:        "enums/invalid",
+		schema:      "testdata/enums/schema.cue",
+		data:        "testdata/enums/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"color", "status", "priority"},
+	},
+
+	// definitions
+	{
+		name:   "definitions/valid",
+		schema: "testdata/definitions/schema.cue",
+		data:   "testdata/definitions/valid.jsonnet",
+	},
+	{
+		name:        "definitions/invalid",
+		schema:      "testdata/definitions/schema.cue",
+		data:        "testdata/definitions/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"age", "email", "phone"},
+	},
+
+	// stdlib (time, strings, list, math packages)
+	{
+		name:   "stdlib/valid",
+		schema: "testdata/stdlib/schema.cue",
+		data:   "testdata/stdlib/valid.jsonnet",
+	},
+	{
+		name:        "stdlib/invalid",
+		schema:      "testdata/stdlib/schema.cue",
+		data:        "testdata/stdlib/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"createdAt", "birthday", "username", "tags", "initials", "angle"},
+	},
+
+	// composition (definition embedding, let bindings)
+	{
+		name:   "composition/valid",
+		schema: "testdata/composition/schema.cue",
+		data:   "testdata/composition/valid.jsonnet",
+	},
+	{
+		name:        "composition/invalid",
+		schema:      "testdata/composition/schema.cue",
+		data:        "testdata/composition/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"updatedAt", "age"},
+	},
+
+	// patterns ([string]: type pattern constraints)
+	{
+		name:   "patterns/valid",
+		schema: "testdata/patterns/schema.cue",
+		data:   "testdata/patterns/valid.jsonnet",
+	},
+	{
+		name:        "patterns/invalid",
+		schema:      "testdata/patterns/schema.cue",
+		data:        "testdata/patterns/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"labels", "counts"},
+	},
+
+	// tuples (fixed-length positional lists)
+	{
+		name:   "tuples/valid",
+		schema: "testdata/tuples/schema.cue",
+		data:   "testdata/tuples/valid.jsonnet",
+	},
+	{
+		name:        "tuples/invalid",
+		schema:      "testdata/tuples/schema.cue",
+		data:        "testdata/tuples/invalid.jsonnet",
+		wantErr:     true,
+		errContains: []string{"color", "position", "tag"},
+	},
+
+	// jsonnet features
+	{
+		name:   "jsonnet/functions",
+		schema: "testdata/jsonnet/functions/schema.cue",
+		data:   "testdata/jsonnet/functions/data.jsonnet",
+	},
+	{
+		name:   "jsonnet/comprehensions",
+		schema: "testdata/jsonnet/comprehensions/schema.cue",
+		data:   "testdata/jsonnet/comprehensions/data.jsonnet",
+	},
+	{
+		name:   "jsonnet/object_comprehension",
+		schema: "testdata/jsonnet/object_comprehension/schema.cue",
+		data:   "testdata/jsonnet/object_comprehension/data.jsonnet",
+	},
+	{
+		name:   "jsonnet/conditionals",
+		schema: "testdata/jsonnet/conditionals/schema.cue",
+		data:   "testdata/jsonnet/conditionals/data.jsonnet",
+	},
+	{
+		name:   "jsonnet/inheritance",
+		schema: "testdata/jsonnet/inheritance/schema.cue",
+		data:   "testdata/jsonnet/inheritance/data.jsonnet",
+	},
+	{
+		name:   "jsonnet/multiline",
+		schema: "testdata/jsonnet/multiline/schema.cue",
+		data:   "testdata/jsonnet/multiline/data.jsonnet",
+	},
+	{
+		name:   "jsonnet/self_reference",
+		schema: "testdata/jsonnet/self_reference/schema.cue",
+		data:   "testdata/jsonnet/self_reference/data.jsonnet",
+	},
+	{
+		name:   "jsonnet/stdlib",
+		schema: "testdata/jsonnet/stdlib/schema.cue",
+		data:   "testdata/jsonnet/stdlib/data.jsonnet",
+	},
 }
 
 func TestCUEsonnet(t *testing.T) {
-	t.Run("config", func(t *testing.T) {
-		t.Parallel()
-		var s Schema
-		err := schema.Decode(strings.NewReader(config), &s)
-		for _, s := range []string{"2", "firstName", "age"} {
-			if !strings.Contains(err.Error(), s) {
-				t.Logf("did not find %q in error", s)
-				t.Fail()
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			sc := cuesonnet.Schema(mustReadFile(t, tc.schema))
+			var v any
+			err := sc.Decode(strings.NewReader(mustReadFile(t, tc.data)), &v)
+			if tc.wantErr {
+				if err == nil {
+					t.Fatal("expected error, got nil")
+				}
+				for _, sub := range tc.errContains {
+					if !strings.Contains(err.Error(), sub) {
+						t.Errorf("error missing %q\n  full error: %v", sub, err)
+					}
+				}
+				return
 			}
-		}
-	})
-
-	t.Run("almost-fixed", func(t *testing.T) {
-		t.Parallel()
-		var s Schema
-		err := schema.Decode(strings.NewReader(almostFixed), &s)
-		for _, s := range []string{"1", "LastName"} {
-			if !strings.Contains(err.Error(), s) {
-				t.Logf("did not find %q in error: %q", s, err)
-				t.Fail()
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
 			}
-		}
-	})
-
-	expect := Schema{
-		FirstName: "Jim",
-		LastName:  "Jimbly",
-		Age:       45,
-		Birthday:  "01/02/2003",
-		Gopher:    true,
+		})
 	}
-	t.Run("fixed", func(t *testing.T) {
-		t.Parallel()
-		var s Schema
-		if err := schema.Decode(strings.NewReader(fixed), &s); err != nil {
-			t.Logf("fixed config should not fail to decode: %v", err)
-			t.Fail()
-		}
-		if s != expect {
-			t.Logf("did not get expected decoding: %+v != %+v", s, expect)
-			t.Fail()
-		}
-	})
-	t.Run("kitchen", func(t *testing.T) {
-		t.Parallel()
-		var s Schema
-		if err := schema.Decode(strings.NewReader(kitchen), &s); err != nil {
-			t.Logf("kitchen config should not fail to decode: %v", err)
-			t.Fail()
-		}
-		if s != expect {
-			t.Logf("did not get expected decoding: %+v != %+v", s, expect)
-			t.Fail()
-		}
-	})
+}
 
-	t.Run("list", func(t *testing.T) {
-		t.Parallel()
-		var s []Schema
-		if err := schemaList.Decode(strings.NewReader(kitchenList), &s); err != nil {
-			t.Logf("kitchen_list config should not fail to decode: %v", err)
-			t.Fail()
-		}
-		if s[0] != expect {
-			t.Logf("did not get expected decoding: %+v != %+v", s, expect)
-			t.Fail()
-		}
-	})
+func mustReadFile(t *testing.T, path string) string {
+	t.Helper()
+	b, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read %s: %v", path, err)
+	}
+	return string(b)
 }

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diff --git a/testdata/almost-fixed.jsonnet b/testdata/person/almost_valid.jsonnet
rename from testdata/almost-fixed.jsonnet
rename to testdata/person/almost_valid.jsonnet

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diff --git a/testdata/composition/invalid.jsonnet b/testdata/composition/invalid.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..4780607208c5030b9348c8748ccb5630c2bc4868
--- /dev/null
+++ b/testdata/composition/invalid.jsonnet
@@ -0,0 +1,9 @@
+[
+  {
+    firstName: 'Alice',
+    lastName: 'Smith',
+    createdAt: '2024-01-15T10:00:00Z',
+    updatedAt: 'not-a-timestamp',
+    age: 200,
+  },
+]

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diff --git a/testdata/composition/schema.cue b/testdata/composition/schema.cue
new file mode 100644
index 0000000000000000000000000000000000000000..de5130045a7bac8718dbc3ffa645a50b1b1f000f
--- /dev/null
+++ b/testdata/composition/schema.cue
@@ -0,0 +1,23 @@
+import "time"
+
+let MaxAge = 150
+
+#Named: {
+	firstName: string
+	lastName:  string
+}
+
+#Timestamped: {
+	createdAt: time.Format(time.RFC3339)
+	updatedAt: time.Format(time.RFC3339)
+}
+
+// Embed definitions inside the body to compose them with new fields.
+// & between two closed definitions cannot add new fields; embedding can.
+#Person: {
+	#Named
+	#Timestamped
+	age: int & >=0 & <=MaxAge
+}
+
+[...#Person]

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diff --git a/testdata/composition/valid.jsonnet b/testdata/composition/valid.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..2a063ddae0fa367e38cfa15b853ccacd9189a26b
--- /dev/null
+++ b/testdata/composition/valid.jsonnet
@@ -0,0 +1,16 @@
+[
+  {
+    firstName: 'Alice',
+    lastName: 'Smith',
+    createdAt: '2024-01-15T10:00:00Z',
+    updatedAt: '2024-06-01T12:00:00Z',
+    age: 30,
+  },
+  {
+    firstName: 'Bob',
+    lastName: 'Jones',
+    createdAt: '2023-05-20T08:30:00Z',
+    updatedAt: '2023-05-20T08:30:00Z',
+    age: 25,
+  },
+]

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diff --git a/testdata/config.jsonnet b/testdata/person/invalid.jsonnet
rename from testdata/config.jsonnet
rename to testdata/person/invalid.jsonnet

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diff --git a/testdata/constraints/invalid_pattern.jsonnet b/testdata/constraints/invalid_pattern.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..dc09400648a89ff529cbd473599dd34be10db721
--- /dev/null
+++ b/testdata/constraints/invalid_pattern.jsonnet
@@ -0,0 +1,8 @@
+{
+  age: 30,
+  score: 50.0,
+  username: 'John Doe',
+  bio: '',
+  level: 3,
+  slug: 'Has Spaces!',
+}

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diff --git a/testdata/constraints/invalid_range.jsonnet b/testdata/constraints/invalid_range.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..5176e1c5e506a8aa120ebc180c332b163ba3ffa1
--- /dev/null
+++ b/testdata/constraints/invalid_range.jsonnet
@@ -0,0 +1,8 @@
+{
+  age: -1,
+  score: 101.0,
+  username: 'john_doe',
+  bio: 'A software engineer.',
+  level: 0,
+  slug: 'valid-slug',
+}

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diff --git a/testdata/constraints/schema.cue b/testdata/constraints/schema.cue
new file mode 100644
index 0000000000000000000000000000000000000000..5fd3d5f853d5635e6cf46d7ecbca8e525838d342
--- /dev/null
+++ b/testdata/constraints/schema.cue
@@ -0,0 +1,11 @@
+import "strings"
+
+#Schema: {
+	age:      int & >=0 & <=150
+	score:    float & >=0.0 & <=100.0
+	username: string & =~"^[a-z][a-z0-9_]{1,19}$"
+	bio:      string & strings.MinRunes(1) & strings.MaxRunes(200)
+	level:    int & !=0
+	slug:     string & !~"[^a-z0-9-]"
+}
+#Schema

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diff --git a/testdata/constraints/valid.jsonnet b/testdata/constraints/valid.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..7ec10540399c856e816d17d91ee7e0f85dc3b44b
--- /dev/null
+++ b/testdata/constraints/valid.jsonnet
@@ -0,0 +1,8 @@
+{
+  age: 30,
+  score: 95.5,
+  username: 'john_doe',
+  bio: 'A software engineer.',
+  level: 5,
+  slug: 'my-slug',
+}

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diff --git a/testdata/defaults/schema.cue b/testdata/defaults/schema.cue
new file mode 100644
index 0000000000000000000000000000000000000000..d0a16302c240ac5fe3be6ea147a9a29b130a957a
--- /dev/null
+++ b/testdata/defaults/schema.cue
@@ -0,0 +1,8 @@
+#Schema: {
+	name:    string
+	role:    "admin" | "user" | "guest" | *"user"
+	enabled: bool | *true
+	timeout: int | *30
+	tags:    [...string] | *[]
+}
+#Schema

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diff --git a/testdata/defaults/valid_minimal.jsonnet b/testdata/defaults/valid_minimal.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..d50010d13b8ca5671f7769ebea3e66ac96f82eb0
--- /dev/null
+++ b/testdata/defaults/valid_minimal.jsonnet
@@ -0,0 +1,3 @@
+{
+  name: 'Alice',
+}

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diff --git a/testdata/defaults/valid_override.jsonnet b/testdata/defaults/valid_override.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..6dbd7f7d47b3b87ce86a0031960348a64c38539f
--- /dev/null
+++ b/testdata/defaults/valid_override.jsonnet
@@ -0,0 +1,7 @@
+{
+  name: 'Alice',
+  role: 'admin',
+  enabled: false,
+  timeout: 60,
+  tags: ['api', 'v2'],
+}

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diff --git a/testdata/definitions/invalid.jsonnet b/testdata/definitions/invalid.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..89dec2f25a933c1a00a0384102957ac87bcd0811
--- /dev/null
+++ b/testdata/definitions/invalid.jsonnet
@@ -0,0 +1,12 @@
+[
+  {
+    name: { first: 'Alice', last: 'Smith' },
+    age: -1,
+    contact: { email: 'not-an-email' },
+  },
+  {
+    name: { first: 'Bob' },
+    age: 25,
+    contact: { phone: '5551234567' },
+  },
+]

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diff --git a/testdata/definitions/schema.cue b/testdata/definitions/schema.cue
new file mode 100644
index 0000000000000000000000000000000000000000..a24508c56723ac43c24b66e1827357dfb476eb2c
--- /dev/null
+++ b/testdata/definitions/schema.cue
@@ -0,0 +1,17 @@
+#Name: {
+	first: string
+	last:  string
+}
+
+#Contact: {
+	email?: =~"^[a-zA-Z0-9._%+\\-]+@[a-zA-Z0-9.\\-]+\\.[a-zA-Z]{2,}$"
+	phone?: =~"^[0-9]{3}-[0-9]{3}-[0-9]{4}$"
+}
+
+#Person: {
+	name:    #Name
+	age:     int & >=0
+	contact: #Contact
+}
+
+[...#Person]

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diff --git a/testdata/definitions/valid.jsonnet b/testdata/definitions/valid.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..b17d4e1025ff148a269f96608d740f567201eee1
--- /dev/null
+++ b/testdata/definitions/valid.jsonnet
@@ -0,0 +1,17 @@
+[
+  {
+    name: { first: 'Alice', last: 'Smith' },
+    age: 30,
+    contact: { email: 'alice@example.com' },
+  },
+  {
+    name: { first: 'Bob', last: 'Jones' },
+    age: 25,
+    contact: { phone: '555-123-4567' },
+  },
+  {
+    name: { first: 'Carol', last: 'White' },
+    age: 42,
+    contact: { email: 'carol@example.com', phone: '123-456-7890' },
+  },
+]

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diff --git a/testdata/disjunctions/invalid.jsonnet b/testdata/disjunctions/invalid.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..c77e81450b4a8b5795f5c954f929008912a1ab1a
--- /dev/null
+++ b/testdata/disjunctions/invalid.jsonnet
@@ -0,0 +1,6 @@
+{
+  value: 3.14,
+  mode: 'exec',
+  priority: 5,
+  nullable: 42,
+}

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diff --git a/testdata/disjunctions/schema.cue b/testdata/disjunctions/schema.cue
new file mode 100644
index 0000000000000000000000000000000000000000..4ed8057441b22dc508926a16f14427e0061f7d24
--- /dev/null
+++ b/testdata/disjunctions/schema.cue
@@ -0,0 +1,14 @@
+#Schema: {
+	// Tagged union: string, int, or bool
+	value: string | int | bool
+
+	// String enum (disjunction of literals)
+	mode: "read" | "write" | "readwrite"
+
+	// Integer enum
+	priority: 1 | 2 | 3
+
+	// Nullable field
+	nullable: string | null
+}
+#Schema

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diff --git a/testdata/disjunctions/valid_a.jsonnet b/testdata/disjunctions/valid_a.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..a70f88a0bc29d4cd8c1396b19763c45466f6bdca
--- /dev/null
+++ b/testdata/disjunctions/valid_a.jsonnet
@@ -0,0 +1,6 @@
+{
+  value: 'text',
+  mode: 'read',
+  priority: 1,
+  nullable: 'present',
+}

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diff --git a/testdata/disjunctions/valid_b.jsonnet b/testdata/disjunctions/valid_b.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..b7f4f87f26e5e9e008becb72b7ae1ef7322a4543
--- /dev/null
+++ b/testdata/disjunctions/valid_b.jsonnet
@@ -0,0 +1,6 @@
+{
+  value: 42,
+  mode: 'write',
+  priority: 3,
+  nullable: null,
+}

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diff --git a/testdata/enums/invalid.jsonnet b/testdata/enums/invalid.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..f80b92ccf8ce39eb5b56ad27c1b8a116a28ee0ef
--- /dev/null
+++ b/testdata/enums/invalid.jsonnet
@@ -0,0 +1,6 @@
+{
+  color: 'purple',
+  status: 'deleted',
+  priority: 6,
+  flags: ['a', 'd'],
+}

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diff --git a/testdata/enums/schema.cue b/testdata/enums/schema.cue
new file mode 100644
index 0000000000000000000000000000000000000000..dd8b91b1068bc4fced0ea2176f4f5e6f65419d48
--- /dev/null
+++ b/testdata/enums/schema.cue
@@ -0,0 +1,11 @@
+#Color:    "red" | "green" | "blue"
+#Status:   "active" | "inactive" | "pending"
+#Priority: 1 | 2 | 3 | 4 | 5
+
+#Schema: {
+	color:    #Color
+	status:   #Status
+	priority: #Priority
+	flags:    [...("a" | "b" | "c")]
+}
+#Schema

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diff --git a/testdata/enums/valid.jsonnet b/testdata/enums/valid.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..4b1c60021c02f77a2bb8378b70bdc7c9aaa46448
--- /dev/null
+++ b/testdata/enums/valid.jsonnet
@@ -0,0 +1,6 @@
+{
+  color: 'red',
+  status: 'active',
+  priority: 3,
+  flags: ['a', 'b'],
+}

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diff --git a/testdata/fixed.jsonnet b/testdata/person/valid.jsonnet
rename from testdata/fixed.jsonnet
rename to testdata/person/valid.jsonnet

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diff --git a/testdata/jsonnet/comprehensions/data.jsonnet b/testdata/jsonnet/comprehensions/data.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..76719de64ca5e56515794e184319e2573b968ce1
--- /dev/null
+++ b/testdata/jsonnet/comprehensions/data.jsonnet
@@ -0,0 +1,10 @@
+local nums = [1, 2, 3, 4, 5];
+
+[
+  {
+    index: n - 1,
+    squared: n * n,
+    label: 'item-' + std.toString(n),
+  }
+  for n in nums
+]

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diff --git a/testdata/jsonnet/comprehensions/schema.cue b/testdata/jsonnet/comprehensions/schema.cue
new file mode 100644
index 0000000000000000000000000000000000000000..951d5b7f89e50e70fbd2d990bf9c22eda9d51784
--- /dev/null
+++ b/testdata/jsonnet/comprehensions/schema.cue
@@ -0,0 +1,6 @@
+#Item: {
+	index:   int & >=0
+	squared: int & >=0
+	label:   string
+}
+[...#Item]

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diff --git a/testdata/jsonnet/conditionals/data.jsonnet b/testdata/jsonnet/conditionals/data.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..6f2eb25a8b8c35420f5d457f0d85978a13d25bb7
--- /dev/null
+++ b/testdata/jsonnet/conditionals/data.jsonnet
@@ -0,0 +1,15 @@
+local classify = function(n)
+  if n < 10 then 'small'
+  else if n < 100 then 'medium'
+  else 'large';
+
+local nums = [3, 42, 150];
+
+[
+  {
+    value: n,
+    category: classify(n),
+    doubled: n * 2,
+  }
+  for n in nums
+]

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diff --git a/testdata/jsonnet/conditionals/schema.cue b/testdata/jsonnet/conditionals/schema.cue
new file mode 100644
index 0000000000000000000000000000000000000000..03b6ad2455eff2dc1729e2dc44c703e5052947a3
--- /dev/null
+++ b/testdata/jsonnet/conditionals/schema.cue
@@ -0,0 +1,6 @@
+#Entry: {
+	value:    int
+	category: "small" | "medium" | "large"
+	doubled:  int
+}
+[...#Entry]

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diff --git a/testdata/jsonnet/functions/data.jsonnet b/testdata/jsonnet/functions/data.jsonnet
new file mode 100644
index 0000000000000000000000000000000000000000..901ec9ab4b75e4e5262da635447218cdf6f74d35
--- /dev/null
+++ b/testdata/jsonnet/functions/data.jsonnet
@@ -0,0 +1,13 @@
+local greet = function(name) 'Hello, ' + name + '!';
+
+local makeUser = function(name, age) {
+  name: name,
+  greeting: greet(name),
+  age: age,
+};
+
+[
+  makeUser('Alice', 30),
+  makeUser('Bob', 25),
+  makeUser('Carol', 35),
+]

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diff --git a/testdata/jsonnet/functions/schema.cue b/testdata/jsonnet/functions/schema.cue
new file mode 100644
index 0000000000000000000000000000000000000000..41ba021d2da2f5eccd4207800b2c1e5795f8d094
--- /dev/null
+++ b/testdata/jsonnet/functions/schema.cue
@@ -0,0 +1,6 @@
+#User: {
+	name:     string
+	greeting: string
+	age:      int & >=0
+}
+[...#User]

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