Here's a list of find/replace based on regexp that allow to change JUnit assertion into FEST assertion (don't forget to check regexp mode in your editor replace window).
A similar idea would be to use the Structured Search and Replace (SSR) feature of IntelliJ IDEA.
Note that FEST & JUnit assertions can coexist together, you don't have to migrate all in one time.
Changing assertEquals(0, myList.size()) to assertThat(myList).isEmpty()
It's important to run this one before the assertEquals -> isEqualTo, to avoid ending with : assertThat(myList.size()).isEqualTo(0)
Changing assertEquals(expectedSize, myList.size()) to assertThat(myList).hasSize(expectedSize)
It's important to run this one before the assertEquals -> isEqualTo, to avoid ending with : assertThat(myList.size()).isEqualTo(expectedSize)
Changing assertEquals(value, valueUnderTest) to assertThat(valueUnderTest).isEqualTo(value)
Changing assertNotEquals(value, valueUnderTest) to assertThat(valueUnderTest).isNotEqualTo(value)
Changing assertNull(objectUnderTest) to assertThat(objectUnderTest).isNull()
Changing assertNotNull(objectUnderTest) to assertThat(objectUnderTest).isNotNull()
Changing assertTrue(logicalCondition) to assertThat(logicalCondition).isTrue()
Changing assertFalse(logicalCondition) to assertThat(logicalCondition).isFalse()
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