diff --git a/android/prebuilt_etc_test.go b/android/prebuilt_etc_test.go
index a5c4480..d977c30 100644
--- a/android/prebuilt_etc_test.go
+++ b/android/prebuilt_etc_test.go
@@ -31,6 +31,7 @@
 	ctx.RegisterModuleType("prebuilt_usr_share", ModuleFactoryAdaptor(PrebuiltUserShareFactory))
 	ctx.RegisterModuleType("prebuilt_usr_share_host", ModuleFactoryAdaptor(PrebuiltUserShareHostFactory))
 	ctx.RegisterModuleType("prebuilt_font", ModuleFactoryAdaptor(PrebuiltFontFactory))
+	ctx.RegisterModuleType("prebuilt_firmware", ModuleFactoryAdaptor(PrebuiltFirmwareFactory))
 	ctx.PreDepsMutators(func(ctx RegisterMutatorsContext) {
 		ctx.BottomUp("prebuilt_etc", prebuiltEtcMutator).Parallel()
 	})
@@ -235,3 +236,39 @@
 		t.Errorf("expected %q, got %q", expected, p.installDirPath.RelPathString())
 	}
 }
+
+func TestPrebuiltFirmwareDirPath(t *testing.T) {
+	targetPath := "target/product/test_device"
+	tests := []struct {
+		description  string
+		config       string
+		expectedPath string
+	}{{
+		description: "prebuilt: system firmware",
+		config: `
+			prebuilt_firmware {
+				name: "foo.conf",
+				src: "foo.conf",
+			}`,
+		expectedPath: filepath.Join(targetPath, "system/etc/firmware"),
+	}, {
+		description: "prebuilt: vendor firmware",
+		config: `
+			prebuilt_firmware {
+				name: "foo.conf",
+				src: "foo.conf",
+				soc_specific: true,
+				sub_dir: "sub_dir",
+			}`,
+		expectedPath: filepath.Join(targetPath, "vendor/firmware/sub_dir"),
+	}}
+	for _, tt := range tests {
+		t.Run(tt.description, func(t *testing.T) {
+			ctx, _ := testPrebuiltEtc(t, tt.config)
+			p := ctx.ModuleForTests("foo.conf", "android_arm64_armv8-a_core").Module().(*PrebuiltEtc)
+			if p.installDirPath.RelPathString() != tt.expectedPath {
+				t.Errorf("expected %q, got %q", tt.expectedPath, p.installDirPath)
+			}
+		})
+	}
+}