错误1：
1 java.lang.Exception: Test class should have exactly one public zero-argument constructor 2 at org.junit.runners.BlockJUnit4ClassRunner.validateZeroArgConstructor(BlockJUnit4ClassRunner.java:171) 3 at org.junit.runners.BlockJUnit4ClassRunner.validateConstructor(BlockJUnit4ClassRunner.java:148) 4 at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:127) 5 at org.junit.runners.ParentRunner.validate(ParentRunner.java:416) 6 at org.junit.runners.ParentRunner.<init>(ParentRunner.java:84) 7 at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65) 8 at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10) 9 at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59) 10 at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26) 11 at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59) 12 at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33) 13 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createUnfilteredTest(JUnit4TestLoader.java:84) 14 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:70) 15 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:43) 16 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:444) 17 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) 18 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) 19 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)