Hamcrest quiz

Test your Hamcrest knowledge with a free interactive quiz — 20 questions with answers and explanations. No signup needed to play.

What does the `is()` matcher do in Hamcrest, e.g. `assertThat(value, is(5))`?

1. What does the `is()` matcher do in Hamcrest, e.g. `assertThat(value, is(5))`?
2. What is Hamcrest?
3. What is a practical downside of over-relying on very generic matchers like `notNullValue()` or `anything()` in tests?
4. What is `hasProperty()` used for, e.g. `assertThat(person, hasProperty("name", equalTo("Alice")))`?
5. What is `closeTo()` used for?
6. What does `containsString()` check, as opposed to `equalTo()`, when asserting on a String?
7. How does Hamcrest typically integrate with JUnit assertions?
8. What does `empty()` (and `emptyCollectionOf(Class)`) check?
9. How do you combine multiple conditions in a single Hamcrest assertion, e.g. requiring a value be both greater than 5 AND less than 10?
10. How do you write a custom Hamcrest matcher for a domain-specific assertion?
11. What is `hasSize()` used for on a collection or array assertion?
12. What advantage does `assertThat(value, greaterThan(5))` have over a plain `assertTrue(value > 5)`?

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