AssertJ

Recipes for migrating to AssertJ and adopting its more expressive assertions.

Composite Recipes

Recipes that include further recipes, often including the individual recipes below.

• Adopt AssertJ BigInteger assertions
• Adopt AssertJ Byte assertions
• Adopt AssertJ Double assertions
• Adopt AssertJ Float assertions
• Adopt AssertJ Integer assertions
• Adopt AssertJ Long assertions
• Adopt AssertJ Short assertions
• AssertJ best practices
• Migrate AssertionsForClassTypes and AssertionsForInterfaceTypes to Assertions
• Migrate Fest 2.x to AssertJ
• Migrate JUnit asserts to AssertJ
• Shorten AssertJ assertions
• Simplify AssertJ chained assertions
• Statically import AssertJ's assertThat

Recipes

• Adopt AssertJ Duration assertions
• Collapse assertThat followed by return into single statement
• Collapse consecutive assertThat statements
• Convert try-catch-fail blocks to AssertJ's assertThatThrownBy
• Decompose assertThat on conjunctions into separate assertions
• JUnit AssertThrows to AssertJ exceptionType
• JUnit assertArrayEquals to AssertJ
• JUnit assertEquals to AssertJ
• JUnit assertFalse to AssertJ
• JUnit assertInstanceOf to AssertJ
• JUnit assertNotEquals to AssertJ
• JUnit assertNotNull to AssertJ
• JUnit assertNull to AssertJ
• JUnit assertSame to AssertJ
• JUnit assertTrue to AssertJ
• JUnit fail to AssertJ
• Place AssertJ descriptions and failure messages before the assertion
• Replace AbstractDateAssert#isEqualToIgnoringMillis(java.util.Date) with isCloseTo(Date, long)
• Replace isCloseTo with isEqualTo
• Replace isCloseTo with isEqualTo
• Replace isCloseTo with isEqualTo
• Replace isCloseTo with isEqualTo
• Replace isCloseTo with isEqualTo
• Replace isCloseTo with isEqualTo
• Replace isCloseTo with isEqualTo
• Replace isEqualTo with isCloseTo
• Replace isEqualTo with isCloseTo
• Replace isEqualTo(0) with isZero()
• Replace isEqualTo(0) with isZero()
• Replace isEqualTo(0) with isZero()
• Replace isEqualTo(0) with isZero()
• Replace isEqualTo(0) with isZero()
• Replace isEqualTo(0) with isZero()
• Replace isEqualTo(0) with isZero()
• Replace isEqualTo(1) with isOne()
• Replace isEqualTo(1) with isOne()
• Replace isEqualTo(1) with isOne()
• Replace isEqualTo(1) with isOne()
• Replace isEqualTo(1) with isOne()
• Replace isEqualTo(1) with isOne()
• Replace isEqualTo(1) with isOne()
• Replace isNotCloseTo with isNotEqualTo
• Replace isNotCloseTo with isNotEqualTo
• Replace isNotCloseTo with isNotEqualTo
• Replace isNotCloseTo with isNotEqualTo
• Replace isNotCloseTo with isNotEqualTo
• Replace isNotCloseTo with isNotEqualTo
• Replace isNotCloseTo with isNotEqualTo
• Replace isNotEqualTo(0) with isNotZero()
• Replace isNotEqualTo(0) with isNotZero()
• Replace isNotEqualTo(0) with isNotZero()
• Replace isNotEqualTo(0) with isNotZero()
• Replace isNotEqualTo(0) with isNotZero()
• Replace isNotEqualTo(0) with isNotZero()
• Replace isNotEqualTo(0) with isNotZero()
• Simplify AssertJ assertions on == and != comparisons
• Simplify AssertJ assertions on SequencedCollection
• Simplify AssertJ assertions on an array's length
• Simplify AssertJ assertions on instanceof expressions
• Simplify AssertJ assertions with hasSize argument
• Simplify AssertJ assertions with literal arguments
• Simplify AssertJ chained assertions
• Simplify assertThat(collection.stream().map(...)) to assertThat(collection).extracting(...)
• Simplify literal-first AssertJ size assertions to hasSize
• Simplify redundant AssertJ assertion chains
• Use Assertions.assertThatObject for ambiguous AssertionsForClassTypes.assertThat calls