Add missing Test annotations

core/src/test/java/info/openrocket/core/motor/ManufacturerTest.java

@@ -24,6 +24,7 @@ public class ManufacturerTest {
 
 	}
 
+	@Test
 	public void testContrail() {
 		Manufacturer c1, c2;
 

core/src/test/java/info/openrocket/core/optimization/rocketoptimization/modifiers/TestGenericModifier.java

@@ -78,6 +78,7 @@ public class TestGenericModifier extends BaseTestCase {
 		assertEquals(4.0, value.d, EPSILON);
 	}
 
+	@Test
 	public void testSingularRange() throws OptimizationException {
 		gm.setMinValue(1.0);
 		gm.setMaxValue(1.0);

core/src/test/java/info/openrocket/core/util/TestMutex.java

@@ -207,6 +207,7 @@ public class TestMutex {
 		}
 	}
 
+	@Test
 	public void testBogusMutex() {
 		SafetyMutex m = new SafetyMutex.BogusSafetyMutex();
 		m.lock("foo");