Expanded.swift

// example of what the macros could be expanded into for XCTestCase
final class PostsCoordinatorTests: XCTestCase {
  func test_addPost() async throws {
    let coordinator = PostsCoordinator()

		coordinator.createPost()
		XCTAssert(coordinator.postCount == 1)
	}

  func test_hasExistingPosts_countsPosts() async throws {
    let coordinator = PostsCoordinator()

		coordinator.posts = [
			.build(),
			.build(),
			.build(),
		]

    XCTAssert(coordinator.postCount == 3)
	}

  func test_hasExistingPosts_addPost() async throws {
    let coordinator = PostsCoordinator()

		coordinator.posts = [
			.build(),
			.build(),
			.build(),
		]

    coordinator.createPost()
    XCTAssert(coordinator.postCount == 4)
	}
}

MacroTest.swift

#Describe(PostsCoordinator.self) {
	// code in describe and context gets re-run for each test
	let coordinator = PostsCoordinator()

	#Test("add post") {
		coordinator.createPost()
		#expect(coordinator.postCount == 1)
	}
	
	#Context("has existing posts") {
		coordinator.posts = [
			.build(),
			.build(),
			.build(),
		]

		#Test("counts posts") {
			#expect(coordinator.postCount == 3)
		}
		#Test("add post") {
			coordinator.createPost()
			#expect(coordinator.postCount == 4)
		}
	}
}