Curso De Testing Kotlin -

@Test fun `verify API is called only once`() = runTest { // 1. Create mock val api = mockk<MyApi>() // 2. Stub a suspend function (coEvery) coEvery { api.getData() } returns "Mocked Response" val repo = Repository(api) // 3. Execute val result = repo.refreshData() // 4. Verify (coVerify) coVerify(exactly = 1) { api.getData() } result shouldBe "Mocked Response" } } Traditional testing (Example-based) says: "Give input 2+2, check output 4." Property-based testing says: "For ALL integers, addition should be commutative."

Whether you are building Android apps, backend services with Ktor or Spring Boot, or multi-platform libraries, Kotlin offers a unique set of tools to make testing not just bearable , but joyful .

src/ test/kotlin/ # Unit tests (run fast, no Android/Server) integrationTest/ # Integration tests (use real DB) testFixtures/ # Shared test data (factories, builders) curso de testing kotlin

It’s time to change that. Welcome to your conceptual .

@Test fun `adding 2 and 3 should return 5`() { val result = Calculator().add(2, 3) assertEquals(5, result) // Or even nicer: assertNotNull(result) } } @Test fun `verify API is called only once`()

Kotest will automatically generate 1000 random pairs of integers (including negative, zero, positive) and run the test. If it fails, it the input to the smallest failing case. Module 6: Testing Flows & SharedFlows Testing StateFlow and SharedFlow requires collecting values in a controlled way. Use TestCollector or launchIn .

Did you find this "curso" useful? Share your biggest testing pain point in the comments below! Execute val result = repo

import kotlinx.coroutines.test.runTest import kotlinx.coroutines.delay class ApiClientTest {