function test_wp_calculate_image_srcset_corrupted_image_meta() {
    $size_array = array( 300, 150 );
    $image_src  = 'http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/2015/12/test-300x150.png';
    $image_meta = array(
      'width'  => 1600,
      'height' => 800,
      'file'   => '2015/12/test.png',
      'sizes'  => array(
        'thumbnail'    => array(
          'file'      => 'test-150x150.png',
          'width'     => 150,
          'height'    => 150,
          'mime-type' => 'image/png',
        ),
        'medium'       => array(
          'file'      => 'test-300x150.png',
          'width'     => 300,
          'height'    => 150,
          'mime-type' => 'image/png',
        ),
        'medium_large' => array(
          'file'      => 'test-768x384.png',
          'width'     => 768,
          'height'    => 384,
          'mime-type' => 'image/png',
        ),
        'large'        => array(
          'file'      => 'test-1024x512.png',
          'width'     => 1024,
          'height'    => 512,
          'mime-type' => 'image/png',
        ),
      ),
    );

    $srcset = array(
      300  => 'http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/2015/12/test-300x150.png 300w',
      768  => 'http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/2015/12/test-768x384.png 768w',
      1024 => 'http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/2015/12/test-1024x512.png 1024w',
      1600 => 'http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/2015/12/test.png 1600w',
    );

    // No sizes array
    $image_meta1 = $image_meta;
    unset( $image_meta1['sizes'] );
    $this->assertFalse( wp_calculate_image_srcset( $size_array, $image_src, $image_meta1 ) );

    // Sizes is string instead of array; only full size available means no srcset.
    $image_meta2          = $image_meta;
    $image_meta2['sizes'] = '';
    $this->assertFalse( wp_calculate_image_srcset( $size_array, $image_src, $image_meta2 ) );

    // File name is incorrect
    $image_meta3         = $image_meta;
    $image_meta3['file'] = '/';
    $this->assertFalse( wp_calculate_image_srcset( $size_array, $image_src, $image_meta3 ) );

    // File name is incorrect
    $image_meta4 = $image_meta;
    unset( $image_meta4['file'] );
    $this->assertFalse( wp_calculate_image_srcset( $size_array, $image_src, $image_meta4 ) );

    // Intermediate size is string instead of array.
    $image_meta5                          = $image_meta;
    $image_meta5['sizes']['medium_large'] = '';
    unset( $srcset[768] );
    $expected_srcset = implode( ', ', $srcset );
    $this->assertSame( $expected_srcset, wp_calculate_image_srcset( $size_array, $image_src, $image_meta5 ) );
  }