[cmake] Make unittests build with swift-testing using CMake.

.gitignore

@@ -1,6 +1,7 @@
 .DS_Store
 /.build
 /build
+/b
 /Packages
 xcuserdata/
 DerivedData/

CMakeLists.txt

@@ -8,10 +8,18 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 set(CMAKE_Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift)
 
-option(SWIFT_WEBDRIVER_BUILD_WINAPPDRIVER "Build WinAppDriver functionality." TRUE)
+option(SWIFT_WEBDRIVER_BUILD_WINAPPDRIVER "Build WinAppDriver functionality." YES)
+option(SWIFT_WEBDRIVER_USE_SWIFT_TESTING "Use Swift Testing framework for testing." NO)
 
-add_subdirectory(Sources/WebDriver)
+if(BUILD_TESTING)
+  add_compile_options($<$<COMPILE_LANGUAGE:Swift>:-enable-testing>)
+endif()
 
+add_subdirectory(Vendor)
+add_subdirectory(Sources/WebDriver)
 if(SWIFT_WEBDRIVER_BUILD_WINAPPDRIVER)
   add_subdirectory(Sources/WinAppDriver)
 endif()
+if(BUILD_TESTING)
+  add_subdirectory(Tests)
+endif()

Tests/CMakeLists.txt

@@ -0,0 +1,18 @@
+SwiftTesting_GenerateDerivedSources()
+message(STATUS "swiftwebdriver_SwiftTesting_Sources: ${swiftwebdriver_SwiftTesting_Sources}")
+message(STATUS "SwiftTesting_TestingMacrosPath: ${SwiftTesting_TestingMacrosPath}")
+
+add_library(TestsCommon
+  Common/PNGUtilities.swift)
+
+add_executable(SwiftWebdriverPackageTests
+  UnitTests/APITests.swift
+  UnitTests/MockWebDriver.swift
+  ${swiftwebdriver_SwiftTesting_Sources})
+set_target_properties(SwiftWebdriverPackageTests PROPERTIES
+  SUFFIX .swift-testing)
+target_link_libraries(SwiftWebdriverPackageTests PRIVATE
+  WebDriver
+  Testing
+  TestingInternals
+  TestsCommon)

Vendor/CMakeLists.txt

@@ -0,0 +1,9 @@
+include(FetchContent)
+
+# Ignore warnings from dependencies' source code.
+add_compile_options($<$<COMPILE_LANGUAGE:Swift>:-suppress-warnings>)
+add_compile_options($<$<COMPILE_LANGUAGE:Swift>:-suppress-remarks>)
+
+if(BUILD_TESTING AND SWIFT_WEBDRIVER_USE_SWIFT_TESTING)
+  include(SwiftTesting.cmake)
+endif()

Vendor/SwiftTesting.cmake

@@ -0,0 +1,10 @@
+FetchContent_Declare(SwiftTesting
+  # GIT_REPOSITORY https://github.com/apple/swift-testing.git
+  # GIT_TAG e07ef28413b5be951fa5672b290bc10fa2e3cd65)
+  GIT_REPOSITORY https://github.com/thebrowsercompany/swift-testing.git
+  GIT_TAG a191e1d53eee05a3dbe2447ca10bab0a617fad82)
+FetchContent_GetProperties(SwiftTesting)
+if(NOT SwiftTesting_POPULATED)
+  message(STATUS "syncing SwiftTesting")
+  FetchContent_MakeAvailable(SwiftTesting)
+endif()