test: added unit tests for the DoNotDisturbUtils utility class (#530)

* test: added unit tests for the DoNotDisturbUtils utility class

Signed-off-by: eho <edvard.holst@gmail.com>

* added Mario's mandatory newline.

Signed-off-by: eho <edvard.holst@gmail.com>

app/src/test/java/com/nextcloud/talk/utils/DoNotDisturbUtilsTest.java

@@ -0,0 +1,116 @@
+package com.nextcloud.talk.utils;
+
+import android.app.NotificationManager;
+import android.content.Context;
+import android.media.AudioManager;
+import android.os.Build;
+import android.os.Vibrator;
+
+import com.nextcloud.talk.application.NextcloudTalkApplication;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.when;
+import static org.powermock.api.mockito.PowerMockito.mockStatic;
+
+@RunWith(PowerMockRunner.class)
+@PrepareForTest(NextcloudTalkApplication.class)
+public class DoNotDisturbUtilsTest {
+
+    @Mock
+    private Context context;
+
+    @Mock
+    private NextcloudTalkApplication application;
+
+    @Mock
+    private NotificationManager notificationManager;
+
+    @Mock
+    private AudioManager audioManager;
+
+    @Mock
+    private Vibrator vibrator;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mockStatic(NextcloudTalkApplication.class);
+        PowerMockito.when(NextcloudTalkApplication.getSharedApplication()).thenReturn(application);
+        when(application.getApplicationContext()).thenReturn(context);
+        when(context.getSystemService(Context.NOTIFICATION_SERVICE)).thenReturn(notificationManager);
+        when(context.getSystemService(Context.AUDIO_SERVICE)).thenReturn(audioManager);
+        when(context.getSystemService(Context.VIBRATOR_SERVICE)).thenReturn(vibrator);
+    }
+
+    private static void setFinalStatic(Field field, Object newValue) throws Exception {
+        field.setAccessible(true);
+
+        Field modifiersField = Field.class.getDeclaredField("modifiers");
+        modifiersField.setAccessible(true);
+        modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
+
+        field.set(null, newValue);
+    }
+
+
+    @Test
+    public void shouldPlaySound_givenAndroidMAndInterruptionFilterNone_assertReturnsFalse()
+            throws Exception {
+        setFinalStatic(Build.VERSION.class.getField("SDK_INT"), Build.VERSION_CODES.M);
+
+        when(notificationManager.getCurrentInterruptionFilter()).thenReturn(NotificationManager.INTERRUPTION_FILTER_NONE);
+        when(audioManager.getRingerMode()).thenReturn(AudioManager.RINGER_MODE_NORMAL);
+
+        assertFalse("shouldPlaySound incorrectly returned true",
+                DoNotDisturbUtils.shouldPlaySound());
+    }
+
+    @Test
+    public void shouldPlaySound_givenRingerModeNotNormal_assertReturnsFalse() throws Exception {
+        setFinalStatic(Build.VERSION.class.getField("SDK_INT"), Build.VERSION_CODES.LOLLIPOP);
+        when(audioManager.getRingerMode()).thenReturn(AudioManager.RINGER_MODE_VIBRATE);
+
+        assertFalse("shouldPlaySound incorrectly returned true",
+                DoNotDisturbUtils.shouldPlaySound());
+    }
+
+    @Test
+    public void shouldVibrate_givenNoVibrator_assertReturnsFalse() {
+        when(vibrator.hasVibrator()).thenReturn(false);
+
+        assertFalse("shouldVibrate returned true despite no vibrator",
+                DoNotDisturbUtils.shouldVibrate(true));
+    }
+
+    @Test
+    public void shouldVibrate_givenVibratorAndRingerModeNormal_assertReturnsTrue() {
+        when(vibrator.hasVibrator()).thenReturn(true);
+
+        when(audioManager.getRingerMode()).thenReturn(AudioManager.RINGER_MODE_NORMAL);
+
+        assertTrue("shouldVibrate incorrectly returned false",
+                DoNotDisturbUtils.shouldVibrate(true));
+    }
+
+    @Test
+    public void shouldVibrate_givenVibratorAndRingerModeSilent_assertReturnsFalse() {
+        when(vibrator.hasVibrator()).thenReturn(true);
+
+        when(audioManager.getRingerMode()).thenReturn(AudioManager.RINGER_MODE_SILENT);
+
+        assertFalse("shouldVibrate returned true despite ringer mode set to silent",
+                DoNotDisturbUtils.shouldVibrate(true));
+    }
+}