@Test
public void singletonCreatesOnlyOneInstance() {
SingletonDBConnection testSingle2 = null;
SingletonDBConnection testSingle3 = null;
testSingle2 = SingletonDBConnection.getInstance();
testSingle3 = SingletonDBConnection.getInstance();
Assert.assertNotNull("Shouldn't be NULL", testSingle2);
Assert.assertNotNull("Shouldn't be NULL", testSingle3);
Assert.assertSame("Should be the same object", testSingle2, testSingle3);
}
/*
I Tried to make a test to prove that a SingletonDBConnection instance
can not be created by calling the constructor directly, because it's
private. The problem is that the class won't compile if it tries to
call the constructor SingletonDBConnection(), so I skipped the test
*/
@Ignore("Couldn't figure out how to make it work yet")
@Test
public void singletonCreatesObjectOnlyThrough_getInstance() {
SingletonDBConnection testSingle4 = null;
// testSingle4 = new SingletonDBConnection();
Assert.assertNull("Should be NULL", testSingle4);
}
@Test
public void singletonCreatesSomeInstance() {
SingletonDBConnection testSingle1 = null;
testSingle1 = SingletonDBConnection.getInstance();
Assert.assertNotNull("Shouldn't be NULL", testSingle1);
}