add small test to assert that neutral is not an enemy

Author: JasperGeurtz

src/test/java/bwapi/PlayerTest.java

@@ -0,0 +1,21 @@
+package bwapi;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertFalse;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class PlayerTest {
+
+    @Test
+    public void neutralIsNotEnemy() {
+        Player neutral = mock(Player.class);
+        Player self = mock(Player.class);
+
+        when(neutral.isNeutral()).thenReturn(true);
+        when(self.isEnemy(neutral)).thenCallRealMethod();
+
+        assertFalse(self.isEnemy(neutral));
+    }
+}