add tests

Author: tido64

scripts/configure.mjs

@@ -113,7 +113,7 @@ export function mergeConfig(lhs, rhs) {
  * @param {string} configPath
  * @returns {boolean}
  */
-function shouldUpdateReactNativeConfig(configPath, fs = nodefs) {
+export function shouldUpdateReactNativeConfig(configPath, fs = nodefs) {
   if (!fs.existsSync(configPath)) {
     return true;
   }

test/configure/shouldUpdateReactNativeConfig.test.ts

@@ -0,0 +1,57 @@
+import { ok } from "node:assert/strict";
+import { afterEach, describe, it } from "node:test";
+import { shouldUpdateReactNativeConfig as shouldUpdateReactNativeConfigActual } from "../../scripts/configure.mjs";
+import { fs, setMockFiles } from "../fs.mock.js";
+
+describe("shouldUpdateReactNativeConfig()", () => {
+  const rnConfigFile = "react-native.config.js";
+
+  const shouldUpdateReactNativeConfig = () =>
+    shouldUpdateReactNativeConfigActual(rnConfigFile, fs);
+
+  afterEach(() => setMockFiles());
+
+  it("returns true if `react-native.config.js` does not exist", () => {
+    ok(shouldUpdateReactNativeConfig());
+  });
+
+  it("returns true if `react-native.config.js` is not configured", () => {
+    setMockFiles({ [rnConfigFile]: "module.exports = {};" });
+
+    ok(shouldUpdateReactNativeConfig());
+  });
+
+  it("returns true if `react-native-test-app` is mentioned but not used", () => {
+    setMockFiles({
+      [rnConfigFile]: `// TODO: Use 'react-native-test-app'
+module.exports = {};
+`,
+    });
+
+    ok(shouldUpdateReactNativeConfig());
+  });
+
+  it("returns false if `react-native-test-app` is configured", () => {
+    setMockFiles({
+      [rnConfigFile]: `const { configureProjects } = require("react-native-test-app");
+module.exports = {
+  project: configureProjects({
+    android: {
+      sourceDir: "android",
+    },
+    ios: {
+      sourceDir: "ios",
+    },
+  }),
+  dependencies: {
+    MyPackage: {
+      root: require("node:path").dirname(__dirname),
+    },
+  },
+};
+`,
+    });
+
+    ok(!shouldUpdateReactNativeConfig());
+  });
+});