Algo to pick every item from array once

		$num_posts = count( $languages );

		$this->gistpens = $this->factory->post->create_many( $num_posts, array(
			'post_type' => 'gistpens',
		), array(
			'post_title' => new WP_UnitTest_Generator_Sequence( 'Post title %s' ),
			'post_name' => new WP_UnitTest_Generator_Sequence( 'Post title %s' ),
			'post_content' => new WP_UnitTest_Generator_Sequence( 'Post content %s' )
		));

		foreach ( $this->gistpens as $gistpen_id ) {
			// Pick a random language
			$num_posts = $num_posts - 1;
			$lang_num = rand( 0, ( $num_posts ) );

			// Get the language's id
			$lang_id = $languages[$lang_num];

			// Remove the language and reindex the languages array
			unset( $languages[$lang_num] );
			$languages = array_values( $languages );