Improve UI test cases

src/test/kotlin/presentation/auth/LoginUserUITest.kt

@@ -0,0 +1,142 @@
+package presentation.auth
+
+import domain.usecases.auth.LoginUseCase
+import io.mockk.coEvery
+import io.mockk.coVerify
+import io.mockk.coVerifySequence
+import io.mockk.just
+import io.mockk.mockk
+import io.mockk.runs
+import kotlinx.coroutines.test.runTest
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import presentation.io.ConsoleIO
+
+class LoginUserUITest {
+    private lateinit var loginUseCase: LoginUseCase
+    private lateinit var consoleIO: ConsoleIO
+    private lateinit var loginUserUI: LoginUserUI
+
+    @BeforeEach
+    fun setUp() {
+        loginUseCase = mockk(relaxed = true)
+        consoleIO = mockk(relaxed = true)
+        loginUserUI = LoginUserUI(loginUseCase, consoleIO)
+    }
+
+    @Test
+    fun `should login successfully on first attempt`() = runTest {
+        // Given
+        val username = "testUser"
+        val password = "testPassword"
+
+        coEvery { consoleIO.read() } returnsMany listOf(username, password)
+        coEvery { loginUseCase(username, password) } returns mockk()
+        coEvery { consoleIO.write(any()) } just runs
+
+        // When
+        loginUserUI()
+
+        // Then
+        coVerifySequence {
+            consoleIO.write("🔐 Login")
+            consoleIO.write("Enter username: ")
+            consoleIO.read()
+            consoleIO.write("Enter password: 🔑")
+            consoleIO.read()
+            loginUseCase(username, password)
+            consoleIO.write("✅ Logged in successfully! Welcome back, $username.")
+        }
+    }
+
+    @Test
+    fun `should retry login after failure and then succeed`() = runTest {
+        // Given
+        val failedUsername = "invalidUser"
+        val failedPassword = "invalidPass"
+        val successUsername = "validUser"
+        val successPassword = "validPass"
+        val errorMessage = "Invalid credentials"
+
+        coEvery { consoleIO.read() } returnsMany listOf(
+            failedUsername, failedPassword,
+            successUsername, successPassword
+        )
+        coEvery { loginUseCase(failedUsername, failedPassword) } throws Exception(errorMessage)
+        coEvery { loginUseCase(successUsername, successPassword) } returns mockk()
+        coEvery { consoleIO.write(any()) } just runs
+
+        // When
+        loginUserUI()
+
+        // Then
+        coVerifySequence {
+            consoleIO.write("🔐 Login")
+            consoleIO.write("Enter username: ")
+            consoleIO.read()
+            consoleIO.write("Enter password: 🔑")
+            consoleIO.read()
+            loginUseCase(failedUsername, failedPassword)
+            consoleIO.write("Login failed. $errorMessage 😞")
+            consoleIO.write("Enter username: ")
+            consoleIO.read()
+            consoleIO.write("Enter password: 🔑")
+            consoleIO.read()
+            loginUseCase(successUsername, successPassword)
+            consoleIO.write("✅ Logged in successfully! Welcome back, $successUsername.")
+        }
+
+        coVerify {
+            loginUseCase(failedUsername, failedPassword)
+            loginUseCase(successUsername, successPassword)
+            consoleIO.write("Login failed. $errorMessage 😞")
+            consoleIO.write("✅ Logged in successfully! Welcome back, $successUsername.")
+        }
+    }
+
+    @Test
+    fun `should handle multiple login failures before success`() = runTest {
+        // Given
+        val inputs = listOf(
+            "user1", "pass1",
+            "user2", "pass2",
+            "user3", "pass3"
+        )
+        val errors = listOf("Invalid username", "Password incorrect")
+
+        coEvery { consoleIO.read() } returnsMany inputs
+        coEvery { loginUseCase("user1", "pass1") } throws Exception(errors[0])
+        coEvery { loginUseCase("user2", "pass2") } throws Exception(errors[1])
+        coEvery { loginUseCase("user3", "pass3") } returns mockk()
+        coEvery { consoleIO.write(any()) } just runs
+
+        // When
+        loginUserUI()
+
+        // Then
+        coVerifySequence {
+            consoleIO.write("🔐 Login")
+
+            consoleIO.write("Enter username: ")
+            consoleIO.read()
+            consoleIO.write("Enter password: 🔑")
+            consoleIO.read()
+            loginUseCase("user1", "pass1")
+            consoleIO.write("Login failed. ${errors[0]} 😞")
+
+            consoleIO.write("Enter username: ")
+            consoleIO.read()
+            consoleIO.write("Enter password: 🔑")
+            consoleIO.read()
+            loginUseCase("user2", "pass2")
+            consoleIO.write("Login failed. ${errors[1]} 😞")
+
+            consoleIO.write("Enter username: ")
+            consoleIO.read()
+            consoleIO.write("Enter password: 🔑")
+            consoleIO.read()
+            loginUseCase("user3", "pass3")
+            consoleIO.write("✅ Logged in successfully! Welcome back, user3.")
+        }
+    }
+}