Add MainViewModel unit tests

app/src/test/java/com/d4rk/androidtutorials/java/ui/screens/main/MainViewModelTest.java

@@ -0,0 +1,173 @@
+package com.d4rk.androidtutorials.java.ui.screens.main;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule;
+
+import com.d4rk.androidtutorials.java.R;
+import com.d4rk.androidtutorials.java.domain.main.ApplyLanguageSettingsUseCase;
+import com.d4rk.androidtutorials.java.domain.main.ApplyThemeSettingsUseCase;
+import com.d4rk.androidtutorials.java.domain.main.GetAppUpdateManagerUseCase;
+import com.d4rk.androidtutorials.java.domain.main.GetBottomNavLabelVisibilityUseCase;
+import com.d4rk.androidtutorials.java.domain.main.GetDefaultTabPreferenceUseCase;
+import com.d4rk.androidtutorials.java.domain.main.MarkStartupScreenShownUseCase;
+import com.d4rk.androidtutorials.java.domain.main.ShouldShowStartupScreenUseCase;
+import com.google.android.material.navigation.NavigationBarView;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+
+public class MainViewModelTest {
+
+    @Rule
+    public InstantTaskExecutorRule instantTaskExecutorRule = new InstantTaskExecutorRule();
+
+    private ApplyThemeSettingsUseCase applyThemeSettingsUseCase;
+    private GetBottomNavLabelVisibilityUseCase getBottomNavLabelVisibilityUseCase;
+    private GetDefaultTabPreferenceUseCase getDefaultTabPreferenceUseCase;
+    private ApplyLanguageSettingsUseCase applyLanguageSettingsUseCase;
+    private ShouldShowStartupScreenUseCase shouldShowStartupScreenUseCase;
+    private MarkStartupScreenShownUseCase markStartupScreenShownUseCase;
+    private GetAppUpdateManagerUseCase getAppUpdateManagerUseCase;
+
+    private final String[] themeValues = {"MODE_NIGHT_FOLLOW_SYSTEM", "MODE_NIGHT_NO", "MODE_NIGHT_YES"};
+    private final String[] bottomNavBarLabelsValues = {"labeled", "selected", "unlabeled"};
+    private final String[] defaultTabValues = {"home", "android_studio", "about"};
+
+    @Before
+    public void setUp() {
+        applyThemeSettingsUseCase = Mockito.mock(ApplyThemeSettingsUseCase.class);
+        getBottomNavLabelVisibilityUseCase = Mockito.mock(GetBottomNavLabelVisibilityUseCase.class);
+        getDefaultTabPreferenceUseCase = Mockito.mock(GetDefaultTabPreferenceUseCase.class);
+        applyLanguageSettingsUseCase = Mockito.mock(ApplyLanguageSettingsUseCase.class);
+        shouldShowStartupScreenUseCase = Mockito.mock(ShouldShowStartupScreenUseCase.class);
+        markStartupScreenShownUseCase = Mockito.mock(MarkStartupScreenShownUseCase.class);
+        getAppUpdateManagerUseCase = Mockito.mock(GetAppUpdateManagerUseCase.class);
+    }
+
+    @Test
+    public void applySettingsUpdatesUiStateForLabeledHome() {
+        Mockito.when(applyThemeSettingsUseCase.invoke(themeValues)).thenReturn(true);
+        Mockito.when(getBottomNavLabelVisibilityUseCase.invoke()).thenReturn("labeled");
+        Mockito.when(getDefaultTabPreferenceUseCase.invoke()).thenReturn("home");
+
+        MainViewModel viewModel = new MainViewModel(
+                applyThemeSettingsUseCase,
+                getBottomNavLabelVisibilityUseCase,
+                getDefaultTabPreferenceUseCase,
+                applyLanguageSettingsUseCase,
+                shouldShowStartupScreenUseCase,
+                markStartupScreenShownUseCase,
+                getAppUpdateManagerUseCase
+        );
+
+        List<Boolean> loading = new ArrayList<>();
+        viewModel.getLoadingState().observeForever(loading::add);
+
+        viewModel.applySettings(themeValues, bottomNavBarLabelsValues, defaultTabValues);
+
+        assertEquals(List.of(false, true, false), loading);
+
+        MainUiState state = viewModel.getUiState().getValue();
+        assertNotNull(state);
+        assertEquals(NavigationBarView.LABEL_VISIBILITY_LABELED, state.bottomNavVisibility());
+        assertEquals(R.id.navigation_home, state.defaultNavDestination());
+        assertTrue(state.themeChanged());
+    }
+
+    @Test
+    public void applySettingsUpdatesUiStateForSelectedAndroidStudio() {
+        Mockito.when(applyThemeSettingsUseCase.invoke(themeValues)).thenReturn(false);
+        Mockito.when(getBottomNavLabelVisibilityUseCase.invoke()).thenReturn("selected");
+        Mockito.when(getDefaultTabPreferenceUseCase.invoke()).thenReturn("android_studio");
+
+        MainViewModel viewModel = new MainViewModel(
+                applyThemeSettingsUseCase,
+                getBottomNavLabelVisibilityUseCase,
+                getDefaultTabPreferenceUseCase,
+                applyLanguageSettingsUseCase,
+                shouldShowStartupScreenUseCase,
+                markStartupScreenShownUseCase,
+                getAppUpdateManagerUseCase
+        );
+
+        List<Boolean> loading = new ArrayList<>();
+        viewModel.getLoadingState().observeForever(loading::add);
+
+        viewModel.applySettings(themeValues, bottomNavBarLabelsValues, defaultTabValues);
+
+        assertEquals(List.of(false, true, false), loading);
+
+        MainUiState state = viewModel.getUiState().getValue();
+        assertNotNull(state);
+        assertEquals(NavigationBarView.LABEL_VISIBILITY_SELECTED, state.bottomNavVisibility());
+        assertEquals(R.id.navigation_android_studio, state.defaultNavDestination());
+        assertTrue(!state.themeChanged());
+    }
+
+    @Test
+    public void applySettingsUpdatesUiStateForUnlabeledAbout() {
+        Mockito.when(applyThemeSettingsUseCase.invoke(themeValues)).thenReturn(true);
+        Mockito.when(getBottomNavLabelVisibilityUseCase.invoke()).thenReturn("unlabeled");
+        Mockito.when(getDefaultTabPreferenceUseCase.invoke()).thenReturn("about");
+
+        MainViewModel viewModel = new MainViewModel(
+                applyThemeSettingsUseCase,
+                getBottomNavLabelVisibilityUseCase,
+                getDefaultTabPreferenceUseCase,
+                applyLanguageSettingsUseCase,
+                shouldShowStartupScreenUseCase,
+                markStartupScreenShownUseCase,
+                getAppUpdateManagerUseCase
+        );
+
+        List<Boolean> loading = new ArrayList<>();
+        viewModel.getLoadingState().observeForever(loading::add);
+
+        viewModel.applySettings(themeValues, bottomNavBarLabelsValues, defaultTabValues);
+
+        assertEquals(List.of(false, true, false), loading);
+
+        MainUiState state = viewModel.getUiState().getValue();
+        assertNotNull(state);
+        assertEquals(NavigationBarView.LABEL_VISIBILITY_UNLABELED, state.bottomNavVisibility());
+        assertEquals(R.id.navigation_about, state.defaultNavDestination());
+        assertTrue(state.themeChanged());
+    }
+
+    private int callVisibilityMode(String value) throws Exception {
+        Method method = MainViewModel.class.getDeclaredMethod(
+                "getVisibilityMode", String.class, String[].class);
+        method.setAccessible(true);
+        return (Integer) method.invoke(null, value, bottomNavBarLabelsValues);
+    }
+
+    @Test
+    public void getVisibilityModeReturnsLabeled() throws Exception {
+        assertEquals(NavigationBarView.LABEL_VISIBILITY_LABELED, callVisibilityMode("labeled"));
+    }
+
+    @Test
+    public void getVisibilityModeReturnsSelected() throws Exception {
+        assertEquals(NavigationBarView.LABEL_VISIBILITY_SELECTED, callVisibilityMode("selected"));
+    }
+
+    @Test
+    public void getVisibilityModeReturnsUnlabeled() throws Exception {
+        assertEquals(NavigationBarView.LABEL_VISIBILITY_UNLABELED, callVisibilityMode("unlabeled"));
+    }
+
+    @Test
+    public void getVisibilityModeReturnsAutoForUnknown() throws Exception {
+        assertEquals(NavigationBarView.LABEL_VISIBILITY_AUTO, callVisibilityMode("other"));
+    }
+}
+