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A set of AssertJ assertion helpers geared toward testing Android.
There is a newer version: 1.2.0
package org.assertj.android.api.widget;

import android.annotation.TargetApi;
import android.widget.GridLayout;
import org.assertj.android.api.view.AbstractViewGroupAssert;

import static android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH;
import static android.widget.GridLayout.ALIGN_BOUNDS;
import static android.widget.GridLayout.ALIGN_MARGINS;
import static android.widget.GridLayout.HORIZONTAL;
import static android.widget.GridLayout.VERTICAL;
import static org.assertj.android.internal.IntegerUtils.buildNamedValueString;
import static org.assertj.core.api.Assertions.assertThat;

/** Assertions for {@link GridLayout} instances. */
@TargetApi(ICE_CREAM_SANDWICH)
public class GridLayoutAssert extends AbstractViewGroupAssert {
  public GridLayoutAssert(GridLayout actual) {
    super(actual, GridLayoutAssert.class);
  }

  public GridLayoutAssert hasAlignmentMode(@GridLayoutAlignmentMode int mode) {
    isNotNull();
    int actualMode = actual.getAlignmentMode();
    //noinspection ResourceType
    assertThat(actualMode) //
        .overridingErrorMessage("Expected alignment mode <%s> but was <%s>.",
            alignmentModeToString(mode), alignmentModeToString(actualMode)) //
        .isEqualTo(mode);
    return this;
  }

  public GridLayoutAssert hasColumnCount(int count) {
    isNotNull();
    int actualCount = actual.getColumnCount();
    assertThat(actualCount) //
        .overridingErrorMessage("Expected column count <%s> but was <%s>.", count, actualCount) //
        .isEqualTo(count);
    return this;
  }

  public GridLayoutAssert hasOrientation(@GridLayoutOrientation int orientation) {
    isNotNull();
    int actualOrientation = actual.getOrientation();
    //noinspection ResourceType
    assertThat(actualOrientation) //
        .overridingErrorMessage("Expected orientation <%s> but was <%s>.",
            orientationToString(orientation), orientationToString(actualOrientation)) //
        .isEqualTo(orientation);
    return this;
  }

  public GridLayoutAssert isVertical() {
    return hasOrientation(VERTICAL);
  }

  public GridLayoutAssert isHorizontal() {
    return hasOrientation(HORIZONTAL);
  }

  public GridLayoutAssert hasRowCount(int count) {
    isNotNull();
    int actualCount = actual.getRowCount();
    assertThat(actualCount) //
        .overridingErrorMessage("Expected row count <%s> but was <%s>.", count, actualCount) //
        .isEqualTo(count);
    return this;
  }

  public GridLayoutAssert isUsingDefaultMargins() {
    isNotNull();
    assertThat(actual.getUseDefaultMargins()) //
        .overridingErrorMessage("Expected to be using default margins but was not.") //
        .isTrue();
    return this;
  }

  public GridLayoutAssert isNotUsingDefaultMargins() {
    isNotNull();
    assertThat(actual.getUseDefaultMargins()) //
        .overridingErrorMessage("Expected to not be using default margins but was.") //
        .isFalse();
    return this;
  }

  public GridLayoutAssert isPreservingColumnOrder() {
    isNotNull();
    assertThat(actual.isColumnOrderPreserved()) //
        .overridingErrorMessage("Expected to be preserving column order but was not.") //
        .isTrue();
    return this;
  }

  public GridLayoutAssert isNotPreservingColumnOrder() {
    isNotNull();
    assertThat(actual.isColumnOrderPreserved()) //
        .overridingErrorMessage("Expected to not be preserving column order but was.") //
        .isFalse();
    return this;
  }

  public GridLayoutAssert isPreservingRowOrder() {
    isNotNull();
    assertThat(actual.isRowOrderPreserved()) //
        .overridingErrorMessage("Expected to be preserving row order but was not.") //
        .isTrue();
    return this;
  }

  public GridLayoutAssert isNotPreservingRowOrder() {
    isNotNull();
    assertThat(actual.isRowOrderPreserved()) //
        .overridingErrorMessage("Expected to not be preserving row order but was.") //
        .isFalse();
    return this;
  }

  public static String alignmentModeToString(@GridLayoutAlignmentMode int mode) {
    return buildNamedValueString(mode)
        .value(ALIGN_BOUNDS, "alignBounds")
        .value(ALIGN_MARGINS, "alignMargins")
        .get();
  }

  public static String orientationToString(@GridLayoutOrientation int orientation) {
    return buildNamedValueString(orientation)
        .value(HORIZONTAL, "horizontal")
        .value(VERTICAL, "vertical")
        .get();
  }
}