Tests for getPrimaryHorizontal with grapheme boundaries

/*

 * Copyright (C) 2016 The Android Open Source 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 android.text;

import android.text.Layout.Alignment;

import junit.framework.TestCase;

/**

 * Tests for text measuring methods of StaticLayout.

 */

public class StaticLayoutTextMeasuringTest extends TestCase {

    private static final float SPACE_MULTI = 1.0f;

    private static final float SPACE_ADD = 0.0f;

    private static final int DEFAULT_OUTER_WIDTH = 150;

    private static final Alignment DEFAULT_ALIGN = Alignment.ALIGN_LEFT;

    private TextPaint mDefaultPaint;

    @Override

    protected void setUp() throws Exception {

        super.setUp();

        if (mDefaultPaint == null) {

            mDefaultPaint = new TextPaint();

        }

    }

    public void testGetPrimaryHorizontal_zwnbsp() {

        // a, ZERO WIDTH NO-BREAK SPACE

        String testString = "a\uFEFF";

        StaticLayout layout = new StaticLayout(testString, mDefaultPaint,

                DEFAULT_OUTER_WIDTH, DEFAULT_ALIGN, SPACE_MULTI, SPACE_ADD, true);

        assertEquals(0.0f, layout.getPrimaryHorizontal(0));

        assertEquals(layout.getPrimaryHorizontal(2), layout.getPrimaryHorizontal(1));

    }

    public void testGetPrimaryHorizontal_devanagari() {

        // DEVANAGARI LETTER KA, DEVANAGARI VOWEL SIGN AA

        String testString = "\u0915\u093E";

        StaticLayout layout = new StaticLayout(testString, mDefaultPaint,

                DEFAULT_OUTER_WIDTH, DEFAULT_ALIGN, SPACE_MULTI, SPACE_ADD, true);

        assertEquals(0.0f, layout.getPrimaryHorizontal(0));

        assertEquals(layout.getPrimaryHorizontal(2), layout.getPrimaryHorizontal(1));

    }

    public void testGetPrimaryHorizontal_flagEmoji() {

        // REGIONAL INDICATOR SYMBOL LETTER U, REGIONAL INDICATOR SYMBOL LETTER S, REGIONAL

        // INDICATOR SYMBOL LETTER Z

        // First two code points (U and S) forms a US flag.

        String testString = "\uD83C\uDDFA\uD83C\uDDF8\uD83C\uDDFF";

        StaticLayout layout = new StaticLayout(testString, mDefaultPaint,

                DEFAULT_OUTER_WIDTH, DEFAULT_ALIGN, SPACE_MULTI, SPACE_ADD, true);

        assertEquals(0.0f, layout.getPrimaryHorizontal(0));

        assertEquals(layout.getPrimaryHorizontal(4), layout.getPrimaryHorizontal(1));

        assertEquals(layout.getPrimaryHorizontal(4), layout.getPrimaryHorizontal(2));

        assertEquals(layout.getPrimaryHorizontal(4), layout.getPrimaryHorizontal(3));

        assertTrue(layout.getPrimaryHorizontal(6) > layout.getPrimaryHorizontal(4));

        assertEquals(layout.getPrimaryHorizontal(6), layout.getPrimaryHorizontal(5));

    }

}