1.php

<?php
  	/**
	 * Test adding the filter
	 *
	 * @covers FilterWPQuery::addFilter()
	 */
	public function testAddFilter()
	{
		//Add filter
		$this->assertTrue(FilterWPQuery::addFilter());
		//Make sure addFilter() had the right effect --  it was added with priority 10
		$this->assertEquals(
			FilterWPQuery::getFilterPriority(),
			has_filter('posts_pre_query', [FilterWPQuery::class, 'callback'])
		);
	}

2.php

<?php
	/**
	 * Test removing the filter
	 *
	 * @covers FilterWPQuery::shouldFilter()
	 */
	public function testFilterRemoved()
	{
		//Add filter
		FilterWPQuery::addFilter();
		//Remove and test return type
		$this->assertTrue(FilterWPQuery::removeFilter());
		//Make sure removeFilter() had the right effect -- the filter was removed
		$this->assertFalse(has_filter('posts_pre_query', [FilterWPQuery::class, 'callback']));
	}

3.php

<?php	
  /**
	 * Test that by default this class does not do anything by default
	 *
	 * @covers FilterWPQuery::shouldFilter()
	 * @covers FilterWPQuery::callback()
	 */
	public function testNotFilteringByDefault()
	{
		//Add one post and save its title and ID in variables for comparing to
		$postTitle = 'The expected post title';
		$postId = $this->factory->post->create(['post_title' => $postTitle]);
		//Add filter
		FilterWPQuery::addFilter();
		//Test that the filter SHOULD not do anything
		$this->assertFalse(FilterWPQuery::shouldFilter());
		//Query for all posts -- should only be one post, the one we just created.
		$query = new \WP_Query(['post_type' => 'post']);
		$this->assertFalse(empty($query->posts));
		$this->assertEquals(1, count($query->posts[0]));
		$this->assertEquals($postId, $query->posts[0]->ID);
		$this->assertEquals($postTitle, $query->posts[0]->post_title);
	}

4.php

<?php
  /**
	 * Test that the getPosts method return an array
	 *
	 * @covers \CalderaLearn\RestSearch\FilterWPQuery::getPosts()
	 */
	public function testGetPosts()
	{
		//Get the mock posts
		$results = FilterWPQuery::getPosts();
		//Make sure results are an array
		$this->assertTrue(is_array($results));
	}

5.php

	/**
	 * Test that the getPosts method returns an array of WP_Posts.
	 *
	 * @covers \CalderaLearn\RestSearch\FilterWPQuery::getPosts()
	 */
	public function testGetPostsArePosts()
	{
		//Get the mock posts
		$results = FilterWPQuery::getPosts();
		$this->assertFalse(empty($results));
		//Make sure results are an array of WP_Posts
		$looped = false;
		foreach ($results as $result) {
			$looped = true;
			//Make sure all results are WP_Posts
			$this->assertTrue(is_a($result, '\WP_Post'), get_class($result));
		}
		//Make sure loop ran
		$this->assertTrue($looped);
	}

6.php

<?php
	/**
	 * Test that the getPosts method returns an array of WP_Posts.
	 *
	 * @covers \CalderaLearn\RestSearch\FilterWPQuery::getPosts()
	 */
	public function testGetPostsArePosts()
	{
		//Get the mock posts
		$results = FilterWPQuery::getPosts();
		$this->assertFalse(empty($results));
		//Make sure results are an array of WP_Posts
		$looped = false;
		foreach ($results as $result) {
			$looped = true;
			//Make sure all results are WP_Posts
			$this->assertTrue(is_a($result, '\WP_Post'), get_class($result));
		}
		//Make sure loop ran
		$this->assertTrue($looped);
	}