# Whitebox.getInternalState()

Similar to `setInternalState()` you can get value of any global field at my time with `getInternalState()` method.

This method is really useful to test any void methods, we can get any state change caused by that void method and write our assertion on that.

for example:

```java
// Example Source Class
public class ExampleClass {

    private int mHeight = 0;

    public void clear() {
        // this is a void method that updated height and does not return anything.
        mHeight = 0;
    }
}
```

With method's like `clear()` that return void but change state of class, we can get value of `mHeight` and check if it was unset or not.

Here is how we would achieve that:

```java
@RunWith(PowerMockRunner.class)
@PrepareForTest({
    ExampleClass.class
})
public class ExampleClassTest {

    private ExampleClass classUnderTest;

    @Before
    public void setUp() throws Exception {
        // Create constructor of ExampleClass
        classUnderTest = new ExampleClass();
    }

    @Test
    public void getHeight_shoudReturnHeightOfView() throws NoSuchMethodException {
        // Given

        // When
        classUnderTest.clear()

        // Then
        final int mHeight = Whitebox.getInternalState(classUnderTest, "mHeight");;
        Assert.assertEquals(0, mHeight);
    }
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://notes.tejpratapsingh.com/_/java-testing/powermockito/whitebox.getinternalstate.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.