diff --git a/android/testing.go b/android/testing.go
index e79562d..3d5e9d9 100644
--- a/android/testing.go
+++ b/android/testing.go
@@ -16,6 +16,7 @@
 
 import (
 	"fmt"
+	"path/filepath"
 	"strings"
 
 	"github.com/google/blueprint"
@@ -78,6 +79,25 @@
 	return TestingModule{module}
 }
 
+// MockFileSystem causes the Context to replace all reads with accesses to the provided map of
+// filenames to contents stored as a byte slice.
+func (ctx *TestContext) MockFileSystem(files map[string][]byte) {
+	// no module list file specified; find every file named Blueprints or Android.bp
+	pathsToParse := []string{}
+	for candidate := range files {
+		base := filepath.Base(candidate)
+		if base == "Blueprints" || base == "Android.bp" {
+			pathsToParse = append(pathsToParse, candidate)
+		}
+	}
+	if len(pathsToParse) < 1 {
+		panic(fmt.Sprintf("No Blueprint or Android.bp files found in mock filesystem: %v\n", files))
+	}
+	files[blueprint.MockModuleListFile] = []byte(strings.Join(pathsToParse, "\n"))
+
+	ctx.Context.MockFileSystem(files)
+}
+
 type TestingModule struct {
 	module Module
 }