断言AssertJ使用方式
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1 // entry point for all assertThat methods and utility methods (e.g. entry) 2 import static org.assertj.core.api.Assertions.*; 3 4 // basic assertions 5 assertThat(frodo.getName()).isEqualTo("Frodo"); 6 assertThat(frodo).isNotEqualTo(sauron); 7 8 // chaining string specific assertions 9 assertThat(frodo.getName()).startsWith("Fro") 10 .endsWith("do") 11 .isEqualToIgnoringCase("frodo"); 12 13 // collection specific assertions (there are plenty more) 14 // in the examples below fellowshipOfTheRing is a List<TolkienCharacter> 15 assertThat(fellowshipOfTheRing).hasSize(9) 16 .contains(frodo, sam) 17 .doesNotContain(sauron); 18 19 // as() is used to describe the test and will be shown before the error message 20 assertThat(frodo.getAge()).as("check %s‘s age", frodo.getName()).isEqualTo(33); 21 22 // Java 8 exception assertion, standard style ... 23 assertThatThrownBy(() -> { throw new Exception("boom!"); }).hasMessage("boom!"); 24 // ... or BDD style 25 Throwable thrown = catchThrowable(() -> { throw new Exception("boom!"); }); 26 assertThat(thrown).hasMessageContaining("boom"); 27 28 // using the ‘extracting‘ feature to check fellowshipOfTheRing character‘s names (Java 7) 29 assertThat(fellowshipOfTheRing).extracting("name") 30 .contains("Boromir", "Gandalf", "Frodo", "Legolas") 31 // same thing using a Java 8 method reference 32 assertThat(fellowshipOfTheRing).extracting(TolkienCharacter::getName) 33 .doesNotContain("Sauron", "Elrond"); 34 35 // extracting multiple values at once grouped in tuples (Java 7) 36 assertThat(fellowshipOfTheRing).extracting("name", "age", "race.name") 37 .contains(tuple("Boromir", 37, "Man"), 38 tuple("Sam", 38, "Hobbit"), 39 tuple("Legolas", 1000, "Elf")); 40 41 // filtering a collection before asserting in Java 7 ... 42 assertThat(fellowshipOfTheRing).filteredOn("race", HOBBIT) 43 .containsOnly(sam, frodo, pippin, merry); 44 // ... or in Java 8 45 assertThat(fellowshipOfTheRing).filteredOn(character -> character.getName().contains("o")) 46 .containsOnly(aragorn, frodo, legolas, boromir); 47 48 // combining filtering and extraction (yes we can) 49 assertThat(fellowshipOfTheRing).filteredOn(character -> character.getName().contains("o")) 50 .containsOnly(aragorn, frodo, legolas, boromir) 51 .extracting(character -> character.getRace().getName()) 52 .contains("Hobbit", "Elf", "Man");
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