Implement custom matcher for comparing BufferedImages

src/test/java/me/goudham/BufferedImageMatcher.java

@@ -0,0 +1,47 @@
+package me.goudham;
+
+import java.awt.image.BufferedImage;
+import org.hamcrest.Description;
+import org.hamcrest.Matcher;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class BufferedImageMatcher implements Matcher<BufferedImage> {
+
+    private final BufferedImage expected;
+
+    public BufferedImageMatcher(BufferedImage expected) {
+        this.expected = expected;
+    }
+
+    @Override
+    public boolean matches(Object argument) {
+        BufferedImage actual = (BufferedImage) argument;
+
+        assertEquals(expected.getWidth(), actual.getWidth());
+        assertEquals(expected.getHeight(), actual.getHeight());
+
+        for (int x = 0; x < actual.getWidth(); x++) {
+            for (int y = 0; y < actual.getHeight(); y++) {
+                assertEquals(expected.getRGB(x, y), actual.getRGB(x, y));
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public void describeMismatch(Object o, Description description) {
+
+    }
+
+    @Override
+    public void _dont_implement_Matcher___instead_extend_BaseMatcher_() {
+
+    }
+
+    @Override
+    public void describeTo(Description description) {
+
+    }
+}