Set up testing with Github Actions.

.github/workflows/maven.yml

@@ -0,0 +1,31 @@
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 7
+      uses: actions/setup-java@v1
+      with:
+        java-version: 7
+    - name: Compile
+      run: mvn -B compile
+    - name: Test
+      run: mvn -B test
+    - name: Package
+      run: mvn -B package
+    - uses: actions/upload-artifact@v2
+      with:
+        name: artifacts
+        path: |
+          target/*.jar
+

test/net/sf/image4j/codec/bmp/BMPDecoderTest.java

@@ -2,10 +2,8 @@
 
 import static org.junit.Assert.*;
 
-import java.awt.Color;
 import java.awt.image.BufferedImage;
-import java.io.File;
-import java.io.IOException;
+import java.awt.image.Raster;
 import java.io.InputStream;
 
 import org.junit.After;
@@ -16,40 +14,44 @@
 
 @RunWith(BlockJUnit4ClassRunner.class)
 public class BMPDecoderTest {
-
-	InputStream is;
-
-	String filename = "/monochrome.bmp";
-
-	@Before
-	public void setUp() throws Exception {
-		is = getClass().getResourceAsStream(filename);
-	}
-
-	@After
-	public void tearDown() throws Exception {
-		if(is != null){
-			is.close();
-		}
-	}
-
-	@Test
-	public void test() throws Exception {
-		assertNotNull("Test file missing", 
-	               getClass().getResource(filename));
-		BufferedImage img = BMPDecoder.read(is);
-
-		javax.swing.JFrame f = new javax.swing.JFrame("test");
-		f.getContentPane().setBackground(Color.green);
-		f.getContentPane().setLayout(new java.awt.BorderLayout(0, 0));
-		f.getContentPane().add(
-				java.awt.BorderLayout.CENTER,
-				new javax.swing.JLabel(
-						new javax.swing.ImageIcon(img)));
-		f.pack();
-		f.setVisible(true);
-
-
-	}
+
+    InputStream is;
+
+    String filename = "/monochrome.bmp";
+
+    @Before
+    public void setUp() throws Exception {
+        is = getClass().getResourceAsStream(filename);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        if (is != null) {
+            is.close();
+        }
+    }
+
+    @Test
+    public void testMonochromeImage() throws Exception {
+        assertNotNull("Test file missing",
+                getClass().getResource(filename));
+        BufferedImage image = BMPDecoder.read(is);
+
+        assertEquals("Wrong width", 4, image.getWidth());
+        assertEquals("Wrong height", 8, image.getHeight());
+        assertEquals("Wrong image type", BufferedImage.TYPE_BYTE_BINARY, image.getType());
+
+        Raster raster = image.getRaster();
+        assertEquals("Wrong number of bands", 1, raster.getNumBands());
+        for (int x = 0; x < image.getWidth(); ++x) {
+            for (int y = 0; y < image.getHeight(); ++y) {
+                if (x == y) {
+                    assertEquals("Wrong pixel on the main diagonal", 1, raster.getSample(x, y, 0));
+                } else {
+                    assertEquals("Wrong pixel outside the main diagonal", 0, raster.getSample(x, y, 0));
+                }
+            }
+        }
+    }
 
 }