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Scala Unit Test Demo -- Scala 的单测框架和示例（JUnit4 & ScalaTest）
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| import org.junit.Assert._ | |
| import org.junit._ | |
| // junit 4 | |
| object UsingJUnit { | |
| @BeforeClass | |
| def beforeClass(): Unit = { | |
| println("before class") | |
| } | |
| @AfterClass | |
| def afterClass(): Unit = { | |
| println("after class") | |
| } | |
| } | |
| class UsingJUnit { | |
| @Before | |
| def before(): Unit = { | |
| println("before test") | |
| } | |
| @After | |
| def after(): Unit = { | |
| println("after test") | |
| } | |
| @Test | |
| def testList(): Unit = { | |
| println("testList") | |
| val list = List("a", "b") | |
| assertEquals(List("a", "b"), list) | |
| assertNotEquals(List("b", "a"), list) | |
| } | |
| } | |
| // junit check exception | |
| class JunitCheckException { | |
| val _thrown = rules.ExpectedException.none | |
| @Rule | |
| def thrown = _thrown | |
| @Test(expected = classOf[IndexOutOfBoundsException]) | |
| def testStringIndexOutOfBounds(): Unit = { | |
| val s = "test string" | |
| s.charAt(-1) | |
| } | |
| @Test | |
| def testStringIndexOutOfBoundsExceptionMessage(): Unit = { | |
| val s = "test string" | |
| thrown.expect(classOf[IndexOutOfBoundsException]) | |
| thrown.expectMessage("String index out of range: -1") | |
| s.charAt(-1) | |
| } | |
| } |
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| import org.scalatest._ | |
| // scala test 3.0.1 | |
| class UsingScalaTest extends FlatSpec with Matchers { | |
| trait EmptyArrayList { | |
| val list = new java.util.ArrayList[String] | |
| } | |
| "a list" should "be empty on create" in new EmptyArrayList { | |
| list.size shouldBe 0 | |
| } | |
| it should "increase in size upon add" in new EmptyArrayList { | |
| list.add("Milk") | |
| list add "Sugar" | |
| list.size should be(2) | |
| } | |
| } | |
| class UsingBeforeAndAfter extends FlatSpec with BeforeAndAfter with Matchers { | |
| var list: java.util.List[String] = _ | |
| before { | |
| println("before") | |
| list = new java.util.ArrayList[String] | |
| } | |
| after { | |
| println("after") | |
| if (list != null) { | |
| list = null | |
| } | |
| } | |
| "a list" should "be empty on create" in { | |
| list.size shouldBe 0 | |
| } | |
| it should "increase in size upon add" in { | |
| list.add("Milk") | |
| list add "Sugar" | |
| list.size should be(2) | |
| } | |
| } | |
| class UsingBeforeAndAfterAll extends FlatSpec with BeforeAndAfterAll with Matchers { | |
| var list: java.util.List[String] = _ | |
| override def beforeAll(): Unit = { | |
| println("before all...") | |
| list = new java.util.ArrayList[String] | |
| super.beforeAll() | |
| } | |
| override def afterAll(): Unit = { | |
| println("after all...") | |
| if (list != null) { | |
| list = null | |
| } | |
| super.afterAll() | |
| } | |
| "a list" should "be empty on create" in { | |
| list.size shouldBe 0 | |
| } | |
| it should "increase in size upon add" in { | |
| list.add("Milk") | |
| list add "Sugar" | |
| list.size should be(2) | |
| } | |
| } | |
| class UsingGivenWhenThen extends FlatSpec with GivenWhenThen with Matchers { | |
| trait EmptyArrayList { | |
| val list = new java.util.ArrayList[String] | |
| } | |
| "a list" should "be empty on create" in new EmptyArrayList { | |
| Given("a empty list") | |
| Then("list size should be 0") | |
| list.size shouldBe 0 | |
| } | |
| it should "increase in size upon add" in new EmptyArrayList { | |
| Given("a empty list") | |
| When("add 2 elements") | |
| list.add("Milk") | |
| list add "Sugar" | |
| Then("list size should be 2") | |
| list.size should be(2) | |
| } | |
| } | |
| // 验证抛出的异常 | |
| // check the exception thrown by method | |
| class ScalaTestCheckException extends FlatSpec with Matchers { | |
| "string" should "throw IndexOutOfBoundsException when index is illegal" in { | |
| val s = "test string" | |
| an [IndexOutOfBoundsException] should be thrownBy s.charAt(-1) | |
| val thrown = the [IndexOutOfBoundsException] thrownBy s.charAt(-1) | |
| thrown.getMessage should equal ("String index out of range: -1") | |
| } | |
| } |
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