Add proper unit tests for double-dispatch pattern

double-dispatch/src/test/java/com/iluwatar/doubledispatch/MeteoroidTest.java

@@ -0,0 +1,87 @@
+package com.iluwatar.doubledispatch;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+/**
+ * Date: 12/10/15 - 11:31 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class MeteoroidTest extends CollisionTest<Meteoroid> {
+
+  @Override
+  final Meteoroid getTestedObject() {
+    return new Meteoroid(1, 2, 3, 4);
+  }
+
+  /**
+   * Test the constructor parameters
+   */
+  @Test
+  public void testConstructor() {
+    final Meteoroid meteoroid = new Meteoroid(1, 2, 3, 4);
+    assertEquals(1, meteoroid.getLeft());
+    assertEquals(2, meteoroid.getTop());
+    assertEquals(3, meteoroid.getRight());
+    assertEquals(4, meteoroid.getBottom());
+    assertFalse(meteoroid.isOnFire());
+    assertFalse(meteoroid.isDamaged());
+    assertEquals("Meteoroid at [1,2,3,4] damaged=false onFire=false", meteoroid.toString());
+  }
+
+  /**
+   * Test what happens we collide with an asteroid
+   */
+  @Test
+  public void testCollideFlamingAsteroid() {
+    testCollision(
+        new FlamingAsteroid(1, 1, 3, 4),
+        false, true,
+        false, false,
+        "Meteoroid hits FlamingAsteroid."
+    );
+  }
+
+  /**
+   * Test what happens we collide with an meteoroid
+   */
+  @Test
+  public void testCollideMeteoroid() {
+    testCollision(
+        new Meteoroid(1, 1, 3, 4),
+        false, false,
+        false, false,
+        "Meteoroid hits Meteoroid."
+    );
+  }
+
+  /**
+   * Test what happens we collide with ISS
+   */
+  @Test
+  public void testCollideSpaceStationIss() {
+    testCollision(
+        new SpaceStationIss(1, 1, 3, 4),
+        true, false,
+        false, false,
+        "Meteoroid hits SpaceStationIss. SpaceStationIss is damaged!"
+    );
+  }
+
+  /**
+   * Test what happens we collide with MIR
+   */
+  @Test
+  public void testCollideSpaceStationMir() {
+    testCollision(
+        new SpaceStationMir(1, 1, 3, 4),
+        true, false,
+        false, false,
+        "Meteoroid hits SpaceStationMir. SpaceStationMir is damaged!"
+    );
+  }
+
+}