This is a pretty dumb question but my first time with unit testing so: lets say I have an object variable like obj and I want my unit test to Fail if this obj is Null. so for assertions, should I say AssertNull or AssertNotNull ? I get confused how they are named.
4 Answers
Use assertNotNull(obj). assert means must be.
The assertNotNull() method means "a passed parameter must not be null": if it is null then the test case fails.
The assertNull() method means "a passed parameter must be null": if it is not null then the test case fails.
String str1 = null;
String str2 = "hello";
// Success.
assertNotNull(str2);
// Fail.
assertNotNull(str1);
// Success.
assertNull(str1);
// Fail.
assertNull(str2);
assertNotNull asserts that the object is not null. If it is null the test fails, so you want that.
I just want to add that if you want to write special text if It null than you make it like that
Assert.assertNotNull("The object you enter return null", str1)
