test(CLI): add unit tests for MainApplication.kt modification

Author: floydkim

cli/commands/initCommand/initAndroid.js

@@ -38,12 +38,11 @@ async function applyMainApplication() {
 async function findMainApplication() {
     const searchPath = path.join(process.cwd(), 'android', 'app', 'src', 'main', 'java');
     const files = fs.readdirSync(searchPath, { recursive: true });
-    // Support only .kt files
-    const mainApplicationFile = files.find(file => file.endsWith('MainApplication.kt'));
+    const mainApplicationFile = files.find(file => file.endsWith('MainApplication.java') || file.endsWith('MainApplication.kt'));
     return mainApplicationFile ? path.join(searchPath, mainApplicationFile) : null;
 }
 
 module.exports = {
     initAndroid: initAndroid,
-    modifyMainApplicationKt,
+    modifyMainApplicationKt: modifyMainApplicationKt,
 };

cli/commands/initCommand/test/initAndroid.test.js

@@ -0,0 +1,52 @@
+
+const { modifyMainApplicationKt } = require('../initAndroid');
+
+// https://github.com/react-native-community/template/blob/0.80.2/template/android/app/src/main/java/com/helloworld/MainApplication.kt
+const ktTemplate = `
+package com.helloworld
+
+import android.app.Application
+import com.facebook.react.PackageList
+import com.facebook.react.ReactApplication
+import com.facebook.react.ReactHost
+import com.facebook.react.ReactNativeApplicationEntryPoint.loadReactNative
+import com.facebook.react.ReactNativeHost
+import com.facebook.react.ReactPackage
+import com.facebook.react.defaults.DefaultReactHost.getDefaultReactHost
+import com.facebook.react.defaults.DefaultReactNativeHost
+
+class MainApplication : Application(), ReactApplication {
+
+  override val reactNativeHost: ReactNativeHost =
+      object : DefaultReactNativeHost(this) {
+        override fun getPackages(): List<ReactPackage> =
+            PackageList(this).packages.apply {
+              // Packages that cannot be autolinked yet can be added manually here, for example:
+              // add(MyReactNativePackage())
+            }
+
+        override fun getJSMainModuleName(): String = "index"
+
+        override fun getUseDeveloperSupport(): Boolean = BuildConfig.DEBUG
+
+        override val isNewArchEnabled: Boolean = BuildConfig.IS_NEW_ARCHITECTURE_ENABLED
+        override val isHermesEnabled: Boolean = BuildConfig.IS_HERMES_ENABLED
+      }
+
+  override val reactHost: ReactHost
+    get() = getDefaultReactHost(applicationContext, reactNativeHost)
+
+  override fun onCreate() {
+    super.onCreate()
+    loadReactNative(this)
+  }
+}
+`;
+
+describe('Android init command - pure functions', () => {
+  it('should correctly modify Kotlin MainApplication content', () => {
+    const modifiedContent = modifyMainApplicationKt(ktTemplate);
+    expect(modifiedContent).toContain('import com.microsoft.codepush.react.CodePush');
+    expect(modifiedContent).toContain('override fun getJSBundleFile(): String = CodePush.getJSBundleFile()');
+  });
+});

cli/commands/initCommand/test/initCommandTest.test.js

@@ -1,5 +1,6 @@
 const { modifyObjectiveCAppDelegate, modifySwiftAppDelegate } = require('../initIos');
 
+// https://github.com/react-native-community/template/blob/0.80.2/template/ios/HelloWorld/AppDelegate.swift
 const swiftTemplate = `
 import UIKit
 import React
@@ -46,6 +47,7 @@ class ReactNativeDelegate: RCTDefaultReactNativeFactoryDelegate {
 }
 `;
 
+// https://github.com/react-native-community/template/blob/0.76.9/template/ios/HelloWorld/AppDelegate.mm
 const objcTemplate = `
 #import "AppDelegate.h"
 
@@ -93,4 +95,4 @@ describe('iOS init command - pure functions', () => {
     expect(modifiedContent).toContain('[CodePush bundleURL]');
     expect(modifiedContent).not.toContain('[[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];');
   });
-});
+});