AssertJ是 JAVA的流畅断言库。
示例代码：
// unique entry point to get access to all assertThat methods and utility methods (e.g. entry) import static org.assertj.core.api.Assertions.*; // common assertions assertThat(frodo.getName()).isEqualTo("Frodo");assertThat(frodo).isNotEqualTo(sauron) .isIn(fellowshipOfTheRing); // String specific assertions assertThat(frodo.getName()).startsWith("Fro") .endsWith("do") .isEqualToIgnoringCase("frodo"); // collection specific assertions assertThat(fellowshipOfTheRing).hasSize(9) .contains(frodo, sam) .doesNotContain(sauron); // using extracting magical feature to check fellowshipOfTheRing characters name :) assertThat(fellowshipOfTheRing).extracting("name").contains("Boromir", "Gandalf", "Frodo", "Legolas") .doesNotContain("Sauron", "Elrond"); // map specific assertions, ringBearers initialized with the elves rings and the one ring bearers. assertThat(ringBearers).hasSize(4) .contains(entry(oneRing, frodo), entry(nenya, galadriel)) .doesNotContainEntry(oneRing, aragorn); // and many more assertions : dates, file, numbers, exceptions ...
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