Add RecipeInfoViewModel test

app/src/test/java/gq/kirmanak/mealient/ui/recipes/info/RecipeInfoViewModelTest.kt

@@ -0,0 +1,75 @@
+package gq.kirmanak.mealient.ui.recipes.info
+
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule
+import androidx.lifecycle.asFlow
+import com.google.common.truth.Truth.assertThat
+import gq.kirmanak.mealient.data.recipes.RecipeRepo
+import gq.kirmanak.mealient.logging.Logger
+import gq.kirmanak.mealient.test.FakeLogger
+import gq.kirmanak.mealient.test.RecipeImplTestData.FULL_CAKE_INFO_ENTITY
+import io.mockk.MockKAnnotations
+import io.mockk.coEvery
+import io.mockk.impl.annotations.MockK
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.runTest
+import kotlinx.coroutines.test.setMain
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class RecipeInfoViewModelTest {
+
+    @get:Rule
+    val instantExecutorRule = InstantTaskExecutorRule()
+
+    private val logger: Logger = FakeLogger()
+
+    @MockK
+    lateinit var recipeRepo: RecipeRepo
+
+    @Before
+    fun setUp() {
+        MockKAnnotations.init(this)
+        Dispatchers.setMain(UnconfinedTestDispatcher())
+
+    }
+
+    @After
+    fun tearDown() {
+        Dispatchers.resetMain()
+    }
+
+    @Test
+    fun `when recipe isn't found then UI state is empty`() = runTest {
+        coEvery { recipeRepo.loadRecipeInfo(eq(RECIPE_ID)) } returns null
+        val uiState = createSubject().uiState.asFlow().first()
+        assertThat(uiState).isEqualTo(RecipeInfoUiState())
+    }
+
+    @Test
+    fun `when recipe is found then UI state has data`() = runTest {
+        coEvery { recipeRepo.loadRecipeInfo(eq(RECIPE_ID)) } returns FULL_CAKE_INFO_ENTITY
+        val expected = RecipeInfoUiState(
+            areIngredientsVisible = true,
+            areInstructionsVisible = true,
+            recipeInfo = FULL_CAKE_INFO_ENTITY
+        )
+        val actual = createSubject().uiState.asFlow().first()
+        assertThat(actual).isEqualTo(expected)
+    }
+
+    private fun createSubject(): RecipeInfoViewModel {
+        val argument = RecipeInfoFragmentArgs(RECIPE_ID).toSavedStateHandle()
+        return RecipeInfoViewModel(recipeRepo, logger, argument)
+    }
+
+    companion object {
+        private const val RECIPE_ID = "1"
+    }
+}