CMSDK : Add tests for ColorUtils

CYNGNOS-3047

Change-Id: Icdea3bd18f80302eb421cbd572abc9e6eeb30f0a

tests/src/org/cyanogenmod/tests/util/ColorUtilTest.java

@@ -0,0 +1,94 @@
+/**
+ * Copyright (c) 2016, The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.cyanogenmod.tests.util;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.drawable.BitmapDrawable;
+import android.test.AndroidTestCase;
+import android.util.MathUtils;
+import cyanogenmod.util.ColorUtils;
+
+public class ColorUtilTest extends AndroidTestCase {
+    private ColorUtils mColorUtils;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        mColorUtils = new ColorUtils();
+    }
+
+    public void testDropAlpha() {
+        // With pre-existing alpha
+        int color = 0xBBCCDD;
+        int alpha = 0xAA000000;
+        int result = mColorUtils.dropAlpha(color | alpha);
+        // Assert alpha was removed
+        assertEquals(Color.alpha(result), 0);
+        // Ensure color is preserved
+        assertEquals(result & color, color);
+
+        // Without pre-existing alpha
+        color = Color.argb(0, 100, 200 ,300);
+        result = mColorUtils.dropAlpha(color);
+        // Assert alpha was removed
+        assertEquals(Color.alpha(result), 0);
+        // Ensure color is preserved
+        assertEquals(result, color);
+    }
+
+    public void testGenerateAlertColorFromDrawable() {
+        // Test null drawable
+        int color = mColorUtils.generateAlertColorFromDrawable(null);
+        assertEquals(color, Color.BLACK);
+
+        Bitmap bitmap = Bitmap.createBitmap(10, 10, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(bitmap);
+        canvas.drawColor(Color.RED);
+
+        // Test fully red bitmap
+        BitmapDrawable bitmapDrawable = new BitmapDrawable(bitmap);
+        color = mColorUtils.generateAlertColorFromDrawable(bitmapDrawable);
+        assertEquals(color, Color.RED);
+
+        // Test blue/red bitmap with blue dominating
+        Paint p = new Paint();
+        p.setColor(Color.BLUE);
+        p.setStyle(Paint.Style.FILL_AND_STROKE);
+        canvas.drawRect(0, 0, 8, 8, p);
+        color = mColorUtils.generateAlertColorFromDrawable(bitmapDrawable);
+        assertEquals(color, Color.BLUE);
+
+        // Test large white + small blue scenario
+        canvas.drawColor(Color.WHITE);
+        canvas.drawRect(0, 0, 2, 2, p);
+        color = mColorUtils.generateAlertColorFromDrawable(bitmapDrawable);
+        assertEquals(color, Color.BLUE);
+
+        // Test large white + small black scenario
+        canvas.drawColor(Color.WHITE);
+        p.setColor(Color.BLACK);
+        canvas.drawRect(0, 0, 2, 2, p);
+        color = mColorUtils.generateAlertColorFromDrawable(bitmapDrawable);
+        assertEquals(color, Color.WHITE);
+
+        assertEquals(bitmap.isRecycled(), false);
+        bitmap.recycle();
+    }
+}