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A set of AssertJ assertion helpers geared toward testing Android.

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package org.assertj.android.design.api.widget;

import android.graphics.drawable.Drawable;
import android.support.design.widget.NavigationView;
import org.assertj.android.api.widget.AbstractFrameLayoutAssert;

import static org.assertj.core.api.Assertions.assertThat;

/** Assertions for {@link NavigationView} instances. */
public class NavigationViewAssert
    extends AbstractFrameLayoutAssert {
  public NavigationViewAssert(NavigationView actual) {
    super(actual, NavigationViewAssert.class);
  }

  public NavigationViewAssert hasItemBackground(Drawable itemBackground) {
    isNotNull();
    Drawable actualItemBackground = actual.getItemBackground();
    assertThat(actualItemBackground) //
        .overridingErrorMessage("Expected item background <%s> but was <%s>.", itemBackground,
            actualItemBackground) //
        .isEqualTo(itemBackground);
    return this;
  }
}