[url_launcher] Add native unit tests for Windows

packages/url_launcher/url_launcher_windows/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+* Added unit tests.
+
 ## 2.0.2
 
 * Replaced reference to `shared_preferences` plugin with the `url_launcher` in the README.

packages/url_launcher/url_launcher_windows/example/windows/CMakeLists.txt

@@ -46,6 +46,9 @@ add_subdirectory(${FLUTTER_MANAGED_DIR})
 # Application build
 add_subdirectory("runner")
 
+# Enable the test target.
+set(include_url_launcher_windows_tests TRUE)
+
 # Generated plugin build rules, which manage building the plugins and adding
 # them to the application.
 include(flutter/generated_plugins.cmake)

packages/url_launcher/url_launcher_windows/example/windows/flutter/CMakeLists.txt

@@ -91,6 +91,7 @@ add_custom_command(
     ${FLUTTER_TOOL_ENVIRONMENT}
     "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.bat"
       windows-x64 $<CONFIG>
+  VERBATIM
 )
 add_custom_target(flutter_assemble DEPENDS
   "${FLUTTER_LIBRARY}"

packages/url_launcher/url_launcher_windows/example/windows/flutter/generated_plugin_registrant.cc

@@ -6,9 +6,9 @@
 
 #include "generated_plugin_registrant.h"
 
-#include <url_launcher_windows/url_launcher_plugin.h>
+#include <url_launcher_windows/url_launcher_windows.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
-  UrlLauncherPluginRegisterWithRegistrar(
-      registry->GetRegistrarForPlugin("UrlLauncherPlugin"));
+  UrlLauncherWindowsRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("UrlLauncherWindows"));
 }

packages/url_launcher/url_launcher_windows/pubspec.yaml

@@ -13,7 +13,7 @@ flutter:
     implements: url_launcher
     platforms:
       windows:
-        pluginClass: UrlLauncherPlugin
+        pluginClass: UrlLauncherWindows
 
 dependencies:
   flutter:

packages/url_launcher/url_launcher_windows/windows/CMakeLists.txt

@@ -4,12 +4,20 @@ project(${PROJECT_NAME} LANGUAGES CXX)
 
 set(PLUGIN_NAME "${PROJECT_NAME}_plugin")
 
-add_library(${PLUGIN_NAME} SHARED
+list(APPEND PLUGIN_SOURCES
+  "system_apis.cpp"
+  "system_apis.h"
   "url_launcher_plugin.cpp"
+  "url_launcher_plugin.h"
+)
+
+add_library(${PLUGIN_NAME} SHARED
+  "include/url_launcher_windows/url_launcher_windows.h"
+  "url_launcher_windows.cpp"
+  ${PLUGIN_SOURCES}
 )
 apply_standard_settings(${PLUGIN_NAME})
-set_target_properties(${PLUGIN_NAME} PROPERTIES
-  CXX_VISIBILITY_PRESET hidden)
+set_target_properties(${PLUGIN_NAME} PROPERTIES CXX_VISIBILITY_PRESET hidden)
 target_compile_definitions(${PLUGIN_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)
 target_include_directories(${PLUGIN_NAME} INTERFACE
   "${CMAKE_CURRENT_SOURCE_DIR}/include")
@@ -20,3 +28,44 @@ set(file_chooser_bundled_libraries
   ""
   PARENT_SCOPE
 )
+
+
+# === Tests ===
+
+if (${include_${PROJECT_NAME}_tests})
+set(TEST_RUNNER "${PROJECT_NAME}_test")
+enable_testing()
+# TODO(stuartmorgan): Consider using a single shared, pre-checked-in googletest
+# instance rather than downloading for each plugin. This approach makes sense
+# for a template, but not for a monorepo with many plugins.
+include(FetchContent)
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/release-1.11.0.zip
+)
+# Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+# Disable install commands for gtest so it doesn't end up in the bundle.
+set(INSTALL_GTEST OFF CACHE BOOL "Disable installation of googletest" FORCE)
+
+FetchContent_MakeAvailable(googletest)
+
+# The plugin's C API is not very useful for unit testing, so build the sources
+# directly into the test binary rather than using the DLL.
+add_executable(${TEST_RUNNER}
+  test/url_launcher_windows_test.cpp
+  ${PLUGIN_SOURCES}
+)
+apply_standard_settings(${TEST_RUNNER})
+target_include_directories(${TEST_RUNNER} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}")
+target_link_libraries(${TEST_RUNNER} PRIVATE flutter_wrapper_plugin)
+target_link_libraries(${TEST_RUNNER} PRIVATE gtest_main gmock)
+# flutter_wrapper_plugin has link dependencies on the Flutter DLL.
+add_custom_command(TARGET ${TEST_RUNNER} POST_BUILD
+  COMMAND ${CMAKE_COMMAND} -E copy_if_different
+  "${FLUTTER_LIBRARY}" $<TARGET_FILE_DIR:${TEST_RUNNER}>
+)
+
+include(GoogleTest)
+gtest_discover_tests(${TEST_RUNNER})
+endif()

packages/url_launcher/url_launcher_windows/windows/include/url_launcher_windows/url_launcher_plugin.h → packages/url_launcher/url_launcher_windows/windows/include/url_launcher_windows/url_launcher_windows.h

@@ -16,7 +16,7 @@
 extern "C" {
 #endif
 
-FLUTTER_PLUGIN_EXPORT void UrlLauncherPluginRegisterWithRegistrar(
+FLUTTER_PLUGIN_EXPORT void UrlLauncherWindowsRegisterWithRegistrar(
     FlutterDesktopPluginRegistrarRef registrar);
 
 #if defined(__cplusplus)

packages/url_launcher/url_launcher_windows/windows/system_apis.cpp

@@ -0,0 +1,38 @@
+// 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.
+#include "system_apis.h"
+
+#include <windows.h>
+
+namespace url_launcher_plugin {
+
+SystemApis::SystemApis() {}
+
+SystemApis::~SystemApis() {}
+
+SystemApisImpl::SystemApisImpl() {}
+
+SystemApisImpl::~SystemApisImpl() {}
+
+LSTATUS SystemApisImpl::RegCloseKey(HKEY key) { return ::RegCloseKey(key); }
+
+LSTATUS SystemApisImpl::RegOpenKeyExW(HKEY key, LPCWSTR sub_key, DWORD options,
+                                      REGSAM desired, PHKEY result) {
+  return ::RegOpenKeyExW(key, sub_key, options, desired, result);
+}
+
+LSTATUS SystemApisImpl::RegQueryValueExW(HKEY key, LPCWSTR value_name,
+                                         LPDWORD type, LPBYTE data,
+                                         LPDWORD data_size) {
+  return ::RegQueryValueExW(key, value_name, nullptr, type, data, data_size);
+}
+
+HINSTANCE SystemApisImpl::ShellExecuteW(HWND hwnd, LPCWSTR operation,
+                                        LPCWSTR file, LPCWSTR parameters,
+                                        LPCWSTR directory, int show_flags) {
+  return ::ShellExecuteW(hwnd, operation, file, parameters, directory,
+                         show_flags);
+}
+
+}  // namespace url_launcher_plugin

packages/url_launcher/url_launcher_windows/windows/system_apis.h

@@ -0,0 +1,56 @@
+// 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.
+#include <windows.h>
+
+namespace url_launcher_plugin {
+
+// An interface wrapping system APIs used by the plugin, for mocking.
+class SystemApis {
+ public:
+  SystemApis();
+  virtual ~SystemApis();
+
+  // Disallow copy and move.
+  SystemApis(const SystemApis&) = delete;
+  SystemApis& operator=(const SystemApis&) = delete;
+
+  // Wrapper for RegCloseKey.
+  virtual LSTATUS RegCloseKey(HKEY key) = 0;
+
+  // Wrapper for RegQueryValueEx.
+  virtual LSTATUS RegQueryValueExW(HKEY key, LPCWSTR value_name, LPDWORD type,
+                                   LPBYTE data, LPDWORD data_size) = 0;
+
+  // Wrapper for RegOpenKeyEx.
+  virtual LSTATUS RegOpenKeyExW(HKEY key, LPCWSTR sub_key, DWORD options,
+                                REGSAM desired, PHKEY result) = 0;
+
+  // Wrapper for ShellExecute.
+  virtual HINSTANCE ShellExecuteW(HWND hwnd, LPCWSTR operation, LPCWSTR file,
+                                  LPCWSTR parameters, LPCWSTR directory,
+                                  int show_flags) = 0;
+};
+
+// Implementation of SystemApis using the Win32 APIs.
+class SystemApisImpl : public SystemApis {
+ public:
+  SystemApisImpl();
+  virtual ~SystemApisImpl();
+
+  // Disallow copy and move.
+  SystemApisImpl(const SystemApisImpl&) = delete;
+  SystemApisImpl& operator=(const SystemApisImpl&) = delete;
+
+  // SystemApis Implementation:
+  virtual LSTATUS RegCloseKey(HKEY key);
+  virtual LSTATUS RegOpenKeyExW(HKEY key, LPCWSTR sub_key, DWORD options,
+                                REGSAM desired, PHKEY result);
+  virtual LSTATUS RegQueryValueExW(HKEY key, LPCWSTR value_name, LPDWORD type,
+                                   LPBYTE data, LPDWORD data_size);
+  virtual HINSTANCE ShellExecuteW(HWND hwnd, LPCWSTR operation, LPCWSTR file,
+                                  LPCWSTR parameters, LPCWSTR directory,
+                                  int show_flags);
+};
+
+}  // namespace url_launcher_plugin

packages/url_launcher/url_launcher_windows/windows/test/url_launcher_windows_test.cpp

@@ -0,0 +1,162 @@
+// 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.
+#include <flutter/method_call.h>
+#include <flutter/method_result_functions.h>
+#include <flutter/standard_method_codec.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <windows.h>
+
+#include <memory>
+#include <string>
+
+#include "url_launcher_plugin.h"
+
+namespace url_launcher_plugin {
+namespace test {
+
+namespace {
+
+using flutter::EncodableMap;
+using flutter::EncodableValue;
+using ::testing::DoAll;
+using ::testing::Pointee;
+using ::testing::Return;
+using ::testing::SetArgPointee;
+
+class MockSystemApis : public SystemApis {
+ public:
+  MOCK_METHOD(LSTATUS, RegCloseKey, (HKEY key), (override));
+  MOCK_METHOD(LSTATUS, RegQueryValueExW,
+              (HKEY key, LPCWSTR value_name, LPDWORD type, LPBYTE data,
+               LPDWORD data_size),
+              (override));
+  MOCK_METHOD(LSTATUS, RegOpenKeyExW,
+              (HKEY key, LPCWSTR sub_key, DWORD options, REGSAM desired,
+               PHKEY result),
+              (override));
+  MOCK_METHOD(HINSTANCE, ShellExecuteW,
+              (HWND hwnd, LPCWSTR operation, LPCWSTR file, LPCWSTR parameters,
+               LPCWSTR directory, int show_flags),
+              (override));
+};
+
+class MockMethodResult : public flutter::MethodResult<> {
+ public:
+  MOCK_METHOD(void, SuccessInternal, (const EncodableValue* result),
+              (override));
+  MOCK_METHOD(void, ErrorInternal,
+              (const std::string& error_code, const std::string& error_message,
+               const EncodableValue* details),
+              (override));
+  MOCK_METHOD(void, NotImplementedInternal, (), (override));
+};
+
+std::unique_ptr<EncodableValue> CreateArgumentsWithUrl(const std::string& url) {
+  EncodableMap args = {
+      {EncodableValue("url"), EncodableValue(url)},
+  };
+  return std::make_unique<EncodableValue>(args);
+}
+
+}  // namespace
+
+TEST(UrlLauncherPlugin, CanLaunchSuccessTrue) {
+  std::unique_ptr<MockSystemApis> system = std::make_unique<MockSystemApis>();
+  std::unique_ptr<MockMethodResult> result =
+      std::make_unique<MockMethodResult>();
+
+  // Return success values from the registery commands.
+  HKEY fake_key = reinterpret_cast<HKEY>(1);
+  EXPECT_CALL(*system, RegOpenKeyExW)
+      .WillOnce(DoAll(SetArgPointee<4>(fake_key), Return(ERROR_SUCCESS)));
+  EXPECT_CALL(*system, RegQueryValueExW).WillOnce(Return(ERROR_SUCCESS));
+  EXPECT_CALL(*system, RegCloseKey(fake_key)).WillOnce(Return(ERROR_SUCCESS));
+  // Expect a success response.
+  EXPECT_CALL(*result, SuccessInternal(Pointee(EncodableValue(true))));
+
+  UrlLauncherPlugin plugin(std::move(system));
+  plugin.HandleMethodCall(
+      flutter::MethodCall("canLaunch",
+                          CreateArgumentsWithUrl("https://some.url.com")),
+      std::move(result));
+}
+
+TEST(UrlLauncherPlugin, CanLaunchQueryFailure) {
+  std::unique_ptr<MockSystemApis> system = std::make_unique<MockSystemApis>();
+  std::unique_ptr<MockMethodResult> result =
+      std::make_unique<MockMethodResult>();
+
+  // Return success values from the registery commands, except for the query,
+  // to simulate a scheme that is in the registry, but has no URL handler.
+  HKEY fake_key = reinterpret_cast<HKEY>(1);
+  EXPECT_CALL(*system, RegOpenKeyExW)
+      .WillOnce(DoAll(SetArgPointee<4>(fake_key), Return(ERROR_SUCCESS)));
+  EXPECT_CALL(*system, RegQueryValueExW).WillOnce(Return(ERROR_FILE_NOT_FOUND));
+  EXPECT_CALL(*system, RegCloseKey(fake_key)).WillOnce(Return(ERROR_SUCCESS));
+  // Expect a success response.
+  EXPECT_CALL(*result, SuccessInternal(Pointee(EncodableValue(false))));
+
+  UrlLauncherPlugin plugin(std::move(system));
+  plugin.HandleMethodCall(
+      flutter::MethodCall("canLaunch",
+                          CreateArgumentsWithUrl("https://some.url.com")),
+      std::move(result));
+}
+
+TEST(UrlLauncherPlugin, CanLaunchHandlesOpenFailure) {
+  std::unique_ptr<MockSystemApis> system = std::make_unique<MockSystemApis>();
+  std::unique_ptr<MockMethodResult> result =
+      std::make_unique<MockMethodResult>();
+
+  // Return failure for opening.
+  EXPECT_CALL(*system, RegOpenKeyExW).WillOnce(Return(ERROR_BAD_PATHNAME));
+  // Expect a success response.
+  EXPECT_CALL(*result, SuccessInternal(Pointee(EncodableValue(false))));
+
+  UrlLauncherPlugin plugin(std::move(system));
+  plugin.HandleMethodCall(
+      flutter::MethodCall("canLaunch",
+                          CreateArgumentsWithUrl("https://some.url.com")),
+      std::move(result));
+}
+
+TEST(UrlLauncherPlugin, LaunchSuccess) {
+  std::unique_ptr<MockSystemApis> system = std::make_unique<MockSystemApis>();
+  std::unique_ptr<MockMethodResult> result =
+      std::make_unique<MockMethodResult>();
+
+  // Return a success value (>32) from launching.
+  EXPECT_CALL(*system, ShellExecuteW)
+      .WillOnce(Return(reinterpret_cast<HINSTANCE>(33)));
+  // Expect a success response.
+  EXPECT_CALL(*result, SuccessInternal(Pointee(EncodableValue(true))));
+
+  UrlLauncherPlugin plugin(std::move(system));
+  plugin.HandleMethodCall(
+      flutter::MethodCall("launch",
+                          CreateArgumentsWithUrl("https://some.url.com")),
+      std::move(result));
+}
+
+TEST(UrlLauncherPlugin, LaunchReportsFailure) {
+  std::unique_ptr<MockSystemApis> system = std::make_unique<MockSystemApis>();
+  std::unique_ptr<MockMethodResult> result =
+      std::make_unique<MockMethodResult>();
+
+  // Return a faile value (<=32) from launching.
+  EXPECT_CALL(*system, ShellExecuteW)
+      .WillOnce(Return(reinterpret_cast<HINSTANCE>(32)));
+  // Expect an error response.
+  EXPECT_CALL(*result, ErrorInternal);
+
+  UrlLauncherPlugin plugin(std::move(system));
+  plugin.HandleMethodCall(
+      flutter::MethodCall("launch",
+                          CreateArgumentsWithUrl("https://some.url.com")),
+      std::move(result));
+}
+
+}  // namespace test
+}  // namespace url_launcher_plugin