Minimal test harness for iOS (#13029)

build/darwin/ios_app.gni

+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+template("ios_app") {
+  assert(is_ios)
+
+  copy("${target_name}__info_plist") {
+    sources = [ invoker.info_plist ]
+    outputs = [ "$root_out_dir/${target_name}.app/Info.plist" ]
+  }
+  executable("$target_name") {
+    forward_variables_from(invoker, "*")
+    output_name = "${target_name}.app/$target_name"
+
+    deps += [
+      ":${target_name}__info_plist",
+    ]
+  }
+}

ci/licenses_golden/licenses_flutter

@@ -731,6 +731,8 @@ FILE: ../../../flutter/shell/platform/darwin/common/framework/Source/FlutterStan
 FILE: ../../../flutter/shell/platform/darwin/common/framework/Source/FlutterStandardCodec_Internal.h
 FILE: ../../../flutter/shell/platform/darwin/common/framework/Source/flutter_codecs_unittest.mm
 FILE: ../../../flutter/shell/platform/darwin/common/framework/Source/flutter_standard_codec_unittest.mm
+FILE: ../../../flutter/shell/platform/darwin/ios/FlutterTestsInfo.plist
+FILE: ../../../flutter/shell/platform/darwin/ios/flutter_unittests.mm
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Flutter.podspec
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Headers/Flutter.h
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Headers/FlutterAppDelegate.h

shell/platform/darwin/ios/BUILD.gn

@@ -5,9 +5,11 @@
 assert(is_ios)
 
 import("//build/config/ios/ios_sdk.gni")
+import("$flutter_root/build/darwin/ios_app.gni")
 import("$flutter_root/common/config.gni")
 import("$flutter_root/shell/gpu/gpu.gni")
 import("$flutter_root/shell/platform/darwin/common/framework_shared.gni")
+import("$flutter_root/testing/testing.gni")
 
 _flutter_framework_dir = "$root_out_dir/Flutter.framework"
 
@@ -248,6 +250,30 @@ shared_library("copy_and_verify_framework_headers") {
   ]
 }
 
+test_fixtures("flutter_tests_fixtures") {
+  fixtures = []
+}
+
+ios_app("FlutterTests") {
+  testonly = true
+
+  info_plist = "FlutterTestsInfo.plist"
+
+  sources = [
+    "flutter_unittests.mm",
+  ]
+
+  libs = [
+    "Foundation.framework",
+  ]
+
+  deps = [
+    ":flutter_tests_fixtures",
+    "//flutter/runtime:libdart",
+    "//flutter/testing",
+  ]
+}
+
 group("flutter_framework") {
   deps = [
     ":copy_and_verify_framework_headers",

shell/platform/darwin/ios/FlutterTestsInfo.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>FlutterTests</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.FlutterTests</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>FlutterTests</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+</dict>
+</plist>

shell/platform/darwin/ios/flutter_unittests.mm

+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Foundation/Foundation.h>
+
+#include "flutter/testing/testing.h"
+
+namespace flutter_tests {
+
+TEST(SmokeTest, Success) {
+  EXPECT_EQ(1, 1);
+}
+
+TEST(SmokeTest, Fail) {
+  EXPECT_EQ(1, 2);
+}
+
+}

testing/run_all_unittests.cc

@@ -2,9 +2,21 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "flutter/fml/build_config.h"
 #include "gtest/gtest.h"
 
+#ifdef OS_IOS
+#include <asl.h>
+#endif  // OS_IOS
+
 int main(int argc, char** argv) {
+#ifdef OS_IOS
+  asl_log_descriptor(NULL, NULL, ASL_LEVEL_NOTICE, STDOUT_FILENO,
+                     ASL_LOG_DESCRIPTOR_WRITE);
+  asl_log_descriptor(NULL, NULL, ASL_LEVEL_ERR, STDERR_FILENO,
+                     ASL_LOG_DESCRIPTOR_WRITE);
+#endif  // OS_IOS
+
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }