> For the complete documentation index, see [llms.txt](https://notes.tejpratapsingh.com/java-testing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://notes.tejpratapsingh.com/java-testing/powermockito/whitebox.getinternalstate.md).

# 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
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

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

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.