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diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000000000000000000000000000000000000..7d4d6317270968bd853fc5bff381f4d7fa90b986
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,17 @@
+---
+kind: pipeline
+name: compliance
+trigger:
+  event:
+    - pull_request
+steps:
+  - name: build
+    pull: always
+    image: golang:1.16
+    commands:
+      - make test
+  - name: check
+    pull: always
+    image: golang:1.16
+    commands:
+      - make vet
\ No newline at end of file

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diff --git a/README.md b/README.md
index 2f32c46f2b5a669669b08efc6e6a4d84fbcad2a6..4f0db5a95038aa5b8f58cec3b0c80bce1bcccf0a 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,7 @@
 # Overlay
+
+[![Build Status](https://ci.jojodev.com/api/badges/jolheiser/overlay/status.svg?ref=refs/heads/main)](https://ci.jojodev.com/jolheiser/overlay)
+
 Overlay File System
 
 Overlay is an easy way to implement a file system in such a way that

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diff --git a/overlay.go b/overlay.go
index 8dab55d4f2bfc65b08fb7b47be9f2b02bffbca84..512bf1c77ece17e9cc8deba0777e8c8ea60d8e10 100644
--- a/overlay.go
+++ b/overlay.go
@@ -6,6 +6,10 @@ 	"os"
 	"path"
 )
 
+// Interface guard
+// fs.ReadFileFS also fulfills fs.FS
+var _ fs.ReadFileFS = (*FS)(nil)
+
 // FS is an overlay File System
 type FS struct {
 	fs      fs.FS
@@ -39,6 +43,14 @@ 	}
 	return f.fs.Open(name)
 }
 
+// ReadFile reads a file, preferring disk
+func (f *FS) ReadFile(name string) ([]byte, error) {
+	if f.exists(name) {
+		return os.ReadFile(f.apn(name))
+	}
+	return fs.ReadFile(f.fs, name)
+}
+
 // ReadDir reads []fs.DirEntry
 // This method will prefer EMBEDDED, because that is the "real" FS for overlay
 func (f *FS) ReadDir(name string) ([]fs.DirEntry, error) {
@@ -64,6 +76,15 @@ 		}
 	}
 
 	return x, nil
+}
+
+// MustNew returns New and panics on error
+func MustNew(root string, fs fs.FS, opts ...Option) *FS {
+	f, err := New(root, fs, opts...)
+	if err != nil {
+		panic(err)
+	}
+	return f
 }
 
 // WithSub sets a fs.Sub for an FS

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diff --git a/overlay_test.go b/overlay_test.go
index 07ec8d203d4ec7feb418e99987c7f6938d9820e8..80ce9189c6af47c7ba0ebf5414a700ecc83bacc6 100644
--- a/overlay_test.go
+++ b/overlay_test.go
@@ -2,7 +2,6 @@ package overlay
 
 import (
 	"embed"
-	"io"
 	"io/fs"
 	"os"
 	"strings"
@@ -49,7 +48,7 @@ 				t.FailNow()
 			}
 			defer fi.Close()
 
-			contents, err := io.ReadAll(fi)
+			contents, err := x.ReadFile(tc.File)
 			if err != nil {
 				t.Log(err)
 				t.FailNow()