Fixed test assertions in order to improve the test coverage

[dearrudam]

Fixed test assertions to use assertFalse assertion method because assertEquals assertion method doesn't call the target object equals method when the 1st provided parameter is null:

FYI, here are some snippet codes from the Junit Jupiter Assertions API that I'm talking about:

The org.junit.jupiter.api.AssertEquals.assertEquals() method:

    static void assertEquals(Object expected, Object actual, Supplier<String> messageSupplier) {
        if (!objectsAreEqual(expected, actual)) {
            failNotEqual(expected, actual, messageSupplier);
        }
    }

And the org.junit.jupiter.api.AssertionUtils.objectsAreEqual():

    static boolean objectsAreEqual(Object obj1, Object obj2) {
        if (obj1 == null) {
            return (obj2 == null);
        }
        return obj1.equals(obj2);
    }

@otaviojava, could you review this PR, please?

[genie-jnosql]

Can one of the admins verify this patch?