idea/java/tests/src/quality/text/DroidFontTest.java

package quality.text;

import org.junit.Test;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.io.File;

import static org.junit.Assert.*;

public class DroidFontTest {
    /* Tests for the following font names and styles:

            "droid sans" : PLAIN, BOLD
            "droid sans bold" : alias for "droid sans"

            "droid sans mono" : PLAIN
            "droid sans mono slashed" : PLAIN
            "droid sans mono dotted" : PLAIN

            "droid serif" : PLAIN, BOLD, ITALIC, BOLD | ITALIC

            "droid serif bold" : alias for "droid serif" BOLD, BOLD | ITALIC
    */

    private static final String abc =
            "the quick brown fox jumps over the lazy dog";

    private static final String digits = "0123456789";

    @SuppressWarnings("SameParameterValue")
    private void doTestFont(String aliasName, String name, int style, int size)
            throws Exception {

        String testDataStr = System.getProperty("testdata");
        assertNotNull("testdata property is not set", testDataStr);

        File testData = new File(testDataStr, "quality" + File.separator + "text");
        assertTrue("Test data dir does not exist", testData.exists());

        String testStr = abc.toUpperCase() + abc + digits;

        BufferedImage image = new BufferedImage((size + 3)*testStr.length(),
                size*3, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = image.createGraphics();

        Font f = new Font(aliasName, style, size);

        g2d.setFont(f);
        g2d.setColor(Color.WHITE);
        Rectangle2D bnd = f.getStringBounds(testStr, g2d.getFontRenderContext());

        g2d.drawString(testStr, 0, size + 3);


        BufferedImage resultImage = image.getSubimage((int) bnd.getX(),
                (int) (size + 3 + bnd.getY()),
                (int) bnd.getWidth(), (int) bnd.getHeight());

        String gfName = name.toLowerCase().replace(" ", "") +
                Integer.toString(style) + "_" + Integer.toString(size) + ".png";

        File goldenFile = new File(testData, gfName);
        if (System.getProperty("gentestdata") == null) {
            BufferedImage goldenImage = ImageIO.read(goldenFile);
            assertTrue("Golden image and result have different sizes",
                    resultImage.getWidth() == goldenImage.getWidth() &&
                            resultImage.getHeight() == resultImage.getHeight());

            Raster gRaster = goldenImage.getData();
            Raster rRaster = resultImage.getData();
            int[] gArr = new int[3];
            int[] rArr = new int[3];
            for (int i = 0; i < gRaster.getWidth(); i++) {
                for (int j = 0; j < gRaster.getHeight(); j++) {
                    gRaster.getPixel(i, j, gArr);
                    rRaster.getPixel(i, j, rArr);
                    assertArrayEquals(
                            "Different pixels found at (" + i + "," + j + ")",
                            gArr, rArr);
                }
            }
        }
        else {
            ImageIO.write(resultImage, "png", goldenFile);
        }
    }

    private void doTestFont(String name, int style)
            throws Exception {
        doTestFont(name, name, style, 20);
    }

        @Test
    public void testDroidSans() throws Exception {
        doTestFont("Droid Sans", Font.PLAIN);
    }

    @Test
    public void testDroidSansBold() throws Exception {
        doTestFont("Droid Sans", Font.BOLD);
        doTestFont("Droid Sans Bold", "Droid Sans", Font.BOLD, 20);
    }

    @Test
    public void testDroidSansMono() throws Exception {
        doTestFont("Droid Sans Mono", Font.PLAIN);
    }

    @Test
    public void testDroidSansMonoSlashed() throws Exception {
        doTestFont("Droid Sans Mono Slashed", Font.PLAIN);
    }

    @Test
    public void testDroidSansMonoDotted() throws Exception {
        doTestFont("Droid Sans Mono Dotted", Font.PLAIN);
    }

    @Test
    public void testDroidSerif() throws Exception {
        doTestFont("Droid Serif", Font.PLAIN);
    }

    @Test
    public void testDroidSerifBold() throws Exception {
        doTestFont("Droid Serif", Font.BOLD);
        doTestFont("Droid Serif Bold", "Droid Serif",
                Font.BOLD, 20);
        doTestFont("Droid Serif Bold", "Droid Serif",
                Font.BOLD | Font.ITALIC, 20);
    }

    @Test
    public void testDroidSerifItalic() throws Exception {
        doTestFont("Droid Serif", Font.ITALIC);
        doTestFont("Droid Serif Italic", "Droid Serif",
                Font.ITALIC, 20);
    }
}