假设

JUnit Jupiter附带了JUnit4提供的一些assumption方法的子集，并增加了一些适合与Java 8 lambda一起使用的方法。所有的JUnit Jupiter assumption都是org.junit.jupiter.Asumptions类中的静态方法。

  1. import static org.junit.jupiter.api.Assertions.assertEquals;
  2. import static org.junit.jupiter.api.Assumptions.assumeTrue;
  3. import static org.junit.jupiter.api.Assumptions.assumingThat;
  5. import org.junit.jupiter.api.Test;
  7. class AssumptionsDemo {
  9.     @Test
  10.     void testOnlyOnCiServer() {
  11.         assumeTrue("CI".equals(System.getenv("ENV")));
  12.         // remainder of test
  13.     }
  15.     @Test
  16.     void testOnlyOnDeveloperWorkstation() {
  17.         assumeTrue("DEV".equals(System.getenv("ENV")),
  18.             () -> "Aborting test: not on developer workstation");
  19.         // remainder of test
  20.     }
  22.     @Test
  23.     void testInAllEnvironments() {
  24.         assumingThat("CI".equals(System.getenv("ENV")),
  25.             () -> {
  26.                 // perform these assertions only on the CI server
  27.                 assertEquals(2, 2);
  28.             });
  30.         // perform these assertions in all environments
  31.         assertEquals("a string", "a string");
  32.     }
  34. }