Java assertEquals不'；当测试预期出现异常时，不显示错误

我最近开始与Junit合作

我有一个函数，它接收一行来自txt文件的值，并返回带有该值的实例

每当该函数接收到错误的值时，我抛出一个异常

我的测试方法是验证异常是否正常工作，以及实例返回的值是否正确

@Test(expected = StudentException.class)
public void testImportStudent() {
    String txtline = "1, Name, Name"; //Wrong, It should be 1, Name
    Source test = studentMain.importStudent(txtline); //Throw error
    txtline = "1, Name"; //Right
    test = percursoGestor.importSource(line); //Test passed
    assertEquals("Error inserting ID", 3, test.getStudentID()); //Test ignores this line
    assertEquals("Error inserting Name", "Nothing", test.getStudentName()); //Test ignores this line
}

因此，我的测试检查是否抛出了错误，但忽略了assertequals，即使我输入了一个与预期不同的值，测试还是通过了。因为我希望抛出一个异常

---

我做错了什么？

您已经用

expected=StudentException.class

注释了您的测试方法

这基本上就是在整个方法周围放置一个

try-catch

块：

@Test(expected = StudentException.class)
public void testImportStudent() {
    try {
        String txtline = "1, Name, Name";
        Source test = studentMain.importStudent(txtline); //Throw error
        txtline = "1, Name";
        test = percursoGestor.importSource(line);
        assertEquals("Error inserting ID", 3, test.getStudentID());
        assertEquals("Error inserting Name", "Nothing", test.getStudentName());
    } catch (Exception e) {
        // verify exception
    }
}

通常情况下：在抛出异常后，不会执行任何操作

干净的方法是采用两种不同的方法：

@Test(expected = StudentException.class)
public void testImportStudent_incorrectInput() {
    String txtline = "1, Name, Name";
    Source test = studentMain.importStudent(txtline);
}

@Test
public void testImportStudent_correctInput() {
    String txtline = "1, Name";
    Source test = percursoGestor.importSource(line);
    assertEquals("Error inserting ID", 3, test.getStudentID());
    assertEquals("Error inserting Name", "Nothing", test.getStudentName());    
}

如果您真的想在一种方法中测试多个案例（您可能不想），那么您可以自己使用

try-catch

@Test
public void testImportStudent() {
    String txtline = "1, Name, Name";
    Source test;
    try {
        test = studentMain.importStudent(txtline);
        // Make sure that the test fails when no exception is thrown
        fail();
    } catch (Exception e) {
        // Check for the correct exception type
        assertTrue(e instanceof StudentException);
    }
    // Other checks
    txtline = "1, Name";
    test = percursoGestor.importSource(line);
    assertEquals("Error inserting ID", 3, test.getStudentID());
    assertEquals("Error inserting Name", "Nothing", test.getStudentName());
}

---

您已经用

expected=StudentException.class

注释了您的测试方法

这基本上就是在整个方法周围放置一个

try-catch

块：

@Test(expected = StudentException.class)
public void testImportStudent() {
    try {
        String txtline = "1, Name, Name";
        Source test = studentMain.importStudent(txtline); //Throw error
        txtline = "1, Name";
        test = percursoGestor.importSource(line);
        assertEquals("Error inserting ID", 3, test.getStudentID());
        assertEquals("Error inserting Name", "Nothing", test.getStudentName());
    } catch (Exception e) {
        // verify exception
    }
}

通常情况下：在抛出异常后，不会执行任何操作

干净的方法是采用两种不同的方法：

@Test(expected = StudentException.class)
public void testImportStudent_incorrectInput() {
    String txtline = "1, Name, Name";
    Source test = studentMain.importStudent(txtline);
}

@Test
public void testImportStudent_correctInput() {
    String txtline = "1, Name";
    Source test = percursoGestor.importSource(line);
    assertEquals("Error inserting ID", 3, test.getStudentID());
    assertEquals("Error inserting Name", "Nothing", test.getStudentName());    
}

如果您真的想在一种方法中测试多个案例（您可能不想），那么您可以自己使用

try-catch

@Test
public void testImportStudent() {
    String txtline = "1, Name, Name";
    Source test;
    try {
        test = studentMain.importStudent(txtline);
        // Make sure that the test fails when no exception is thrown
        fail();
    } catch (Exception e) {
        // Check for the correct exception type
        assertTrue(e instanceof StudentException);
    }
    // Other checks
    txtline = "1, Name";
    test = percursoGestor.importSource(line);
    assertEquals("Error inserting ID", 3, test.getStudentID());
    assertEquals("Error inserting Name", "Nothing", test.getStudentName());
}