Added test coverage to auto focus feature

packages/camera/camera/android/src/main/java/io/flutter/plugins/camera/features/autofocus/AutoFocusFeature.java

@@ -24,7 +24,7 @@ public AutoFocusFeature(CameraProperties cameraProperties, boolean recordingVide
 
   @Override
   public String getDebugName() {
-    return "AutoFocus";
+    return "AutoFocusFeature";
   }
 
   @Override

packages/camera/camera/android/src/test/java/io/flutter/plugins/camera/features/autofocus/AutoFocusFeatureTest.java

@@ -0,0 +1,163 @@
+package io.flutter.plugins.camera.features.autofocus;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CaptureRequest;
+import io.flutter.plugins.camera.CameraProperties;
+import org.junit.Test;
+
+public class AutoFocusFeatureTest {
+  private static final int[] FOCUS_MODES_ONLY_OFF = new int[] { CameraCharacteristics.CONTROL_AF_MODE_OFF };
+  private static final int[] FOCUS_MODES = new int[] { CameraCharacteristics.CONTROL_AF_MODE_OFF, CameraCharacteristics.CONTROL_AF_MODE_AUTO };
+
+  @Test
+  public void getDebugName_should_return_the_name_of_the_feature() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    assertEquals("AutoFocusFeature", autoFocusFeature.getDebugName());
+  }
+
+  @Test
+  public void getValue_should_return_auto_if_not_set() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    assertEquals(FocusMode.auto, autoFocusFeature.getValue());
+  }
+
+  @Test
+  public void getValue_should_echo_the_set_value() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+    FocusMode expectedValue = FocusMode.locked;
+
+    autoFocusFeature.setValue(expectedValue);
+    FocusMode actualValue = autoFocusFeature.getValue();
+
+    assertEquals(expectedValue, actualValue);
+  }
+
+  @Test
+  public void checkIsSupported_should_return_false_when_minimum_focus_distance_is_zero() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    when(mockCameraProperties.getControlAutoFocusAvailableModes()).thenReturn(FOCUS_MODES);
+    when(mockCameraProperties.getLensInfoMinimumFocusDistance()).thenReturn(0.0F);
+
+    assertFalse(autoFocusFeature.checkIsSupported());
+  }
+
+  @Test
+  public void checkIsSupported_should_return_false_when_minimum_focus_distance_is_null() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    when(mockCameraProperties.getControlAutoFocusAvailableModes()).thenReturn(FOCUS_MODES);
+    when(mockCameraProperties.getLensInfoMinimumFocusDistance()).thenReturn(null);
+
+    assertFalse(autoFocusFeature.checkIsSupported());
+  }
+
+  @Test
+  public void checkIsSupport_should_return_false_when_no_focus_modes_are_available() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    when(mockCameraProperties.getControlAutoFocusAvailableModes()).thenReturn(new int[] {});
+    when(mockCameraProperties.getLensInfoMinimumFocusDistance()).thenReturn(1.0F);
+
+    assertFalse(autoFocusFeature.checkIsSupported());
+  }
+
+  @Test
+  public void checkIsSupport_should_return_false_when_only_focus_off_is_available() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    when(mockCameraProperties.getControlAutoFocusAvailableModes()).thenReturn(FOCUS_MODES_ONLY_OFF);
+    when(mockCameraProperties.getLensInfoMinimumFocusDistance()).thenReturn(1.0F);
+
+    assertFalse(autoFocusFeature.checkIsSupported());
+  }
+
+  @Test
+  public void checkIsSupport_should_return_true_when_only_multiple_focus_modes_are_available() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    when(mockCameraProperties.getControlAutoFocusAvailableModes()).thenReturn(FOCUS_MODES);
+    when(mockCameraProperties.getLensInfoMinimumFocusDistance()).thenReturn(1.0F);
+
+    assertTrue(autoFocusFeature.checkIsSupported());
+  }
+
+  @Test
+  public void updateBuilder_should_return_when_checkIsSupported_is_false() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    CaptureRequest.Builder mockBuilder = mock(CaptureRequest.Builder.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    when(mockCameraProperties.getControlAutoFocusAvailableModes()).thenReturn(FOCUS_MODES);
+    when(mockCameraProperties.getLensInfoMinimumFocusDistance()).thenReturn(0.0F);
+
+    autoFocusFeature.updateBuilder(mockBuilder);
+
+    verify(mockBuilder, never()).set(any(), any());
+  }
+
+  @Test
+  public void updateBuilder_should_set_control_mode_to_auto_when_focus_is_locked() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    CaptureRequest.Builder mockBuilder = mock(CaptureRequest.Builder.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    when(mockCameraProperties.getControlAutoFocusAvailableModes()).thenReturn(FOCUS_MODES);
+    when(mockCameraProperties.getLensInfoMinimumFocusDistance()).thenReturn(1.0F);
+
+    autoFocusFeature.setValue(FocusMode.locked);
+    autoFocusFeature.updateBuilder(mockBuilder);
+
+    verify(mockBuilder, times(1)).set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_AUTO);
+  }
+
+  @Test
+  public void updateBuilder_should_set_control_mode_to_continuous_video_when_focus_is_auto_and_recording_video() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    CaptureRequest.Builder mockBuilder = mock(CaptureRequest.Builder.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, true);
+
+    when(mockCameraProperties.getControlAutoFocusAvailableModes()).thenReturn(FOCUS_MODES);
+    when(mockCameraProperties.getLensInfoMinimumFocusDistance()).thenReturn(1.0F);
+
+    autoFocusFeature.setValue(FocusMode.auto);
+    autoFocusFeature.updateBuilder(mockBuilder);
+
+    verify(mockBuilder, times(1)).set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_VIDEO);
+  }
+
+  @Test
+  public void updateBuilder_should_set_control_mode_to_continuous_video_when_focus_is_auto_and_not_recording_video() {
+    CameraProperties mockCameraProperties = mock(CameraProperties.class);
+    CaptureRequest.Builder mockBuilder = mock(CaptureRequest.Builder.class);
+    AutoFocusFeature autoFocusFeature = new AutoFocusFeature(mockCameraProperties, false);
+
+    when(mockCameraProperties.getControlAutoFocusAvailableModes()).thenReturn(FOCUS_MODES);
+    when(mockCameraProperties.getLensInfoMinimumFocusDistance()).thenReturn(1.0F);
+
+    autoFocusFeature.setValue(FocusMode.auto);
+    autoFocusFeature.updateBuilder(mockBuilder);
+
+    verify(mockBuilder, times(1)).set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
+  }
+}