use-assert-in

Collection: fixit-extra Autofix: Yes Python: Any

Prefer assertIn and assertNotIn for unittest membership checks.

Message

Use assertIn/assertNotIn instead of assertTrue/assertFalse for inclusion check.

References

• unittest deprecated aliases

• unittest assertIn

Valid examples

self.assertIn(a, b)

self.assertIn(f(), b)

self.assertIn(f(x), b)

self.assertIn(f(g(x)), b)

self.assertNotIn(a, b)

self.assertNotIn(f(), b)

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self.assertNotIn(f(x), b)

self.assertNotIn(f(g(x)), b)

class Checker:
    def assertTrue(self, expr):
        print(expr)

    def check(self, a, b):
        self.assertTrue(a in b)

Invalid examples

self.assertTrue(a in b)

Suggested fix

self.assertIn(a, b)

self.assertTrue(f() in b)

Suggested fix

self.assertIn(f(), b)

self.assertTrue(f(x) in b)

Suggested fix

self.assertIn(f(x), b)

Show more

self.assertTrue(f(g(x)) in b)

Suggested fix

self.assertIn(f(g(x)), b)

self.assertTrue(a not in b)

Suggested fix

self.assertNotIn(a, b)

self.assertTrue(not a in b)

Suggested fix

self.assertNotIn(a, b)

self.assertFalse(a in b)

Suggested fix

self.assertNotIn(a, b)