public function test_400x400_no_crop() {
    // Landscape: resize 640x480 to fit 400x400: 400x300.
    $out = image_resize_dimensions( 640, 480, 400, 400, false );
    // dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w, src_h.
    $this->assertSame( array( 0, 0, 0, 0, 400, 300, 640, 480 ), $out );

    // Portrait: resize 480x640 to fit 400x400: 300x400.
    $out = image_resize_dimensions( 480, 640, 400, 400, false );
    // dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w, src_h.
    $this->assertSame( array( 0, 0, 0, 0, 300, 400, 480, 640 ), $out );
  }