Edit Question - KnowledgeHub

Title Body

The following class serve as generic tester for equals/hashCode contract. It is a part of a home grown testing framework. What do you think about? How can I (strong) test this class? It is a good use of Junit theories? The class: @Ignore @RunWith(Theories.class) public abstract class ObjectTest { // For any non-null reference value x, x.equals(x) should return true @Theory public void equalsIsReflexive(Object x) { assumeThat(x, is(not(equalTo(null)))); assertThat(x.equals(x), is(true)); } // For any non-null reference values x and y, x.equals(y) // should return true if and only if y.equals(x) returns true. @Theory public void equalsIsSymmetric(Object x, Object y) { assumeThat(x, is(not(equalTo(null)))); assumeThat(y, is(not(equalTo(null)))); assumeThat(y.equals(x), is(true)); assertThat(x.equals(y), is(true)); } // For any non-null reference values x, y, and z, if x.equals(y) // returns true and y.equals(z) returns true, then x.equals(z) // should return true. @Theory public void equalsIsTransitive(Object x, Object y, Object z) { assumeThat(x, is(not(equalTo(null)))); assumeThat(y, is(not(equalTo(null)))); assumeThat(z, is(not(equalTo(null)))); assumeThat(x.equals(y) && y.equals(z), is(true)); assertThat(z.equals(x), is(true)); } // For any non-null reference values x and y, multiple invocations // of x.equals(y) consistently return true or consistently return // false, provided no information used in equals comparisons on // the objects is modified. @Theory public void equalsIsConsistent(Object x, Object y) { assumeThat(x, is(not(equalTo(null)))); boolean alwaysTheSame = x.equals(y); for (int i = 0; i < 30; i++) { assertThat(x.equals(y), is(alwaysTheSame)); }

Tags (comma-separated) Cancel