Add test for SignInUseCaseImpl

app/src/test/java/com/hieuwu/groceriesstore/domain/usecases/impl/SignInUseCaseImplTest.kt

@@ -0,0 +1,62 @@
+package com.hieuwu.groceriesstore.domain.usecases.impl
+
+import com.hieuwu.groceriesstore.data.repository.UserRepository
+import com.hieuwu.groceriesstore.domain.usecases.SignInUseCase
+import java.util.UUID
+import kotlinx.coroutines.runBlocking
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import junit.framework.TestCase.assertEquals
+import org.mockito.Mock
+import org.mockito.junit.MockitoJUnitRunner
+import org.mockito.kotlin.whenever
+import kotlin.random.Random
+
+@RunWith(MockitoJUnitRunner::class)
+class SignInUseCaseImplTest {
+
+    @Mock
+    lateinit var mockedUserRepository: UserRepository
+    private lateinit var testee: SignInUseCase
+
+    @Before
+    fun setUp() {
+        testee = SignInUseCaseImpl(
+            userRepository = mockedUserRepository
+        )
+    }
+
+    @Test
+    fun whenExecute_withoutException_thenReturnCorrectValue() {
+        val input = SignInUseCase.Input(
+            email = UUID.randomUUID().toString(),
+            password = UUID.randomUUID().toString()
+        )
+        val authenticationResult = Random.nextBoolean()
+
+        runBlocking {
+            whenever(mockedUserRepository.authenticate(input.email, input.password))
+                .thenReturn(authenticationResult)
+
+            val output = testee.execute(input)
+            assertEquals(authenticationResult, output.result)
+        }
+    }
+
+    @Test
+    fun whenExecute_withException_thenReturnAccountNotExistedError() {
+        val input = SignInUseCase.Input(
+            email = UUID.randomUUID().toString(),
+            password = UUID.randomUUID().toString()
+        )
+
+        runBlocking {
+            whenever(mockedUserRepository.authenticate(input.email, input.password))
+                .thenThrow(RuntimeException())
+
+            val output = testee.execute(input)
+            assertEquals(SignInUseCase.Output.AccountNotExistedError, output)
+        }
+    }
+}