Question 1

How to ignore extra fields in JsonUnit assertions?

Accepted Answer

Use the IGNORING_EXTRA_FIELDS option, e.g., assertThatJson(actual).when(IGNORING_EXTRA_FIELDS).isEqualTo(expected). This allows comparing JSON documents while ignoring unexpected keys in the actual value.

Question 2

JsonUnit vs AssertJ JSON assertions: which is better?

Accepted Answer

JsonUnit's AssertJ integration combines both libraries, offering JsonUnit's flexible comparison with AssertJ's fluent API. Use JsonUnit if you need features like JsonPath or placeholders; pure AssertJ might suffice for simpler JSON checks.

Question 3

How to use JsonPath with JsonUnit in Spring tests?

Accepted Answer

In Spring MVC or WebTestClient tests, use the inPath method, e.g., json().inPath('$.store.book').isArray().contains(...). This leverages JsonPath for targeted assertions within JSON responses.

Question 4

Can JsonUnit handle unordered JSON arrays?

Accepted Answer

Yes, use the IGNORING_ARRAY_ORDER option, e.g., assertThatJson(actual).when(IGNORING_ARRAY_ORDER).isEqualTo(expected). This ignores the order of elements in arrays during comparison.

Question 5

How to set tolerance for floating-point numbers in JsonUnit?

Accepted Answer

Use the withTolerance method, e.g., assertThatJson(actual).node('value').withTolerance(0.001).isEqualTo(1.0). This allows approximate equality for numerical comparisons to avoid precision issues.

Question 6

JsonUnit or Hamcrest for JSON testing in Java?

Accepted Answer

JsonUnit's Hamcrest integration provides matchers like jsonEquals, but JsonUnit with AssertJ is recommended for a more expressive API. Choose based on your existing test framework; Hamcrest is standard, while AssertJ offers better fluency.

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