How to use storedLocally method of org.junit.experimental.max.MaxCore class

Since Exception is a checked exception, you either:

• Have to catch the exception in a try...catch statement, or
• Declare the exception to be thrown in the method itself.

What you have up there works fine, but my personal preference is to declare the exception to be thrown. This way, if an exception I'm not expecting is thrown during the run of the test, the test will fail.

@Test
public void someTest() throws Exception {
    // dodgy code here
}

If we need to see if a specific exception is thrown, then you have the option of using @Rule or adding the value to the @Test annotation directly.

@Test(expected = FileNotFoundException.class)
public void someTest() throws Exception {
    // dodgy code here
}

In JUnit 5, you can leverage Assertions.assertThrows to accomplish the same thing. I'm less familiar with this overall since it's not yet GA at the time of editing, but it appears to accept an Executable coming from JUnit 5.

@Test
public void someTest() {
    assertThrows(FileNotFoundException.class, () ->
         { dodgyService.breakableMethod() };
}

Your getScore() returns Double, not double. Therefore compiler is confused: Should it convert both arguments to Object, or if it should convert only the Double to double?

    double a = 2.0;
    Double b = 2.0;
    // assertEquals(a,b); // fails to compile
    // the compiler is confused whether to use
    assertEquals((Object) a,(Object) b); // OK
    // or
    assertEquals(a,(double) b); // OK

Anyway, I would set the method to return primitive type double.

As the Exception says add a default Constructor to your Class. This is needed for the initialisation by the testing framework. Replace your constructor:

public MainActivityTest(Class<MainActivity> activityClass) {
    super(activityClass);
}

by the following:

public MainActivityTest() {
    super(MainActivity.class);
}

This constructor has no arguments as needed by the framework and showing in the code listing of your tutorial:

Try Skyscreamer's JSONAssert.

Its non-strict mode has two major advantages that make it less brittle:

• Object extensibility (e.g. With an expected value of {id:1}, this would still pass: {id:1,moredata:'x'}.)
• Loose array ordering (e.g. ['dog','cat']==['cat','dog'])

In strict mode it behaves more like json-lib's test class.

A test looks something like this:

@Test
public void testGetFriends() {
    JSONObject data = getRESTData("/friends/367.json");
    String expected = "{friends:[{id:123,name:\"Corby Page\"}"
        + ",{id:456,name:\"Solomon Duskis\"}]}";
    JSONAssert.assertEquals(expected, data, false);
}

The parameters in the JSONAssert.assertEquals() call are expectedJSONString, actualDataString, and isStrict.

The result messages are pretty clear, which is important when comparing really big JSON objects.

@RunWith(SpringRunner.class) : You need this annotation to just enable spring boot features like @Autowire, @MockBean etc.. during junit testing

is used to provide a bridge between Spring Boot test features and JUnit. Whenever we are using any Spring Boot testing features in our JUnit tests, this annotation will be required.

@SpringBootTest : This annotation is used to load complete application context for end to end integration testing

The @SpringBootTest annotation can be used when we need to bootstrap the entire container. The annotation works by creating the ApplicationContext that will be utilized in our tests.

Here is the article with clear examples on both scenarios Baeldung

Another argument for suffix - at least in english language:

A class usually represents a noun, it is a model of a concept. An instance of one of your tests would be a 'MyClass test'. In contrast, a method would model some kind of action, like 'test [the] calculate [method]'.

Because of this, I'd always use the 'suffix' for test classes and the prefix for test methods:

the MyClass test          --> MyClassTest
test the calculate method --> testCalculate()

The JUnit library resides wherever you tell it to reside. Personally, I would forget entirely about linking against the jar files shipped with Eclipse and instead download the jars directly.

If I have a project, say at path /project then I would try to put the dependency somewhere in that hierarchy, like at /project/test/lib/junit.jar. If my ant build file is then /project/build.xml then it's as simple as adding ./test/lib/junit.jar to the JUnit classpath. Trying to reference an arbitrary location on your machine is fragile (remember, Eclipse could be installed anywhere), particularly when using relative paths (since your project contents could also be stored anywhere).

A test oracle is a source of information about whether the output of a program (or function or method) is correct or not.

A test oracle might specify correct output for all possible input or only for specific input. It might not specify actual output values but only constraints on them.

The oracle might be

• a program (separate from the system under test) which takes the same input and produces the same output
• documentation that gives specific correct outputs for specific given inputs
• a documented algorithm that a human could use to calculate correct outputs for given inputs
• a human domain expert who can somehow look at the output and tell whether it is correct
• or any other way of telling that output is correct.

If not vague, the concept is at least very broad.

An oracle isn't a test runner, but a test runner could use an oracle as a source of correct output to which to compare the system-under-test's output, or as a source of constraints against which to evaluate the SUT's output.

In your example, you used your personal ability to carry out the algorithm of addition as your oracle. Instead, you could use a different implementation of that algorithm as an oracle:

assertEquals("2 + 3 is 5", 2 + 3, tester.sum(2, 3));

You will get this exception, if you use the JUnit 4.4 core runner to execute a class that has no "@Test" method. Kindly consult the link for more info.

courtesy vipin8169