use-assert-in

Collection: fixit-extra Autofix: Yes Python: Any

Prefer assertIn and assertNotIn for unittest membership checks.

Message

Use assertIn() or assertNotIn() for membership checks.

References

• 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)

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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)