_Beans_WP_Customize.php

<?php
/**
 * Tests for add() method of _Beans_WP_Customize.
 *
 * @package Beans\Framework\Tests\Unit\API\WP-Customize
 *
 * @since   1.5.0
 */

namespace Beans\Framework\Tests\Unit\API\WPCustomize;

use Beans\Framework\Tests\Unit\API\WPCustomize\Includes\WP_Customize_Test_Case;
use Brain\Monkey;
use Mockery;

require_once dirname( __DIR__ ) . '/includes/class-wp-customize-test-case.php';

/**
 * Class Tests_Beans_Options_Actions
 *
 * @package Beans\Framework\Tests\Unit\API\Options
 * @group   api
 * @group   api-wp-customize
 */
class Tests_Beans_WP_Customize_Add extends WP_Customize_Test_Case {

	/**
	 * Test add().
	 */
	public function test_add_adds() {
		$test_data = static::$test_data['single_fields'];

		$mocked_wp_customize = Mockery::mock( 'WP_Customize_Manager' );
		global $wp_customize;
		$wp_customize = $mocked_wp_customize; // phpcs:ignore WordPress.Variables.GlobalVariables.OverrideProhibited -- Limited to test function scope.
		$mocked_wp_customize->shouldReceive( 'get_section' )->andReturn( true );

		Monkey\Functions\expect( 'beans_get_fields' )
		->with( 'wp_customize', $test_data['section'] )
		->once()
		->ordered()
		->andReturn( array() )
		->andAlsoExpectIt()
		->with( 'wp_customize', $test_data['section'] )
		->once()
		->ordered()
		->andReturn( array() );

		Monkey\Functions\expect( 'beans_add_attribute' )
		->with( 'beans_field_label', 'class', 'customize-control-title' )
		->once()
		->andReturn( true );

		$customizer = new \_Beans_WP_Customize( $test_data['section'], $test_data['args'] );
		$add        = $this->get_reflective_method( 'add' );

		$this->assertNull( $add->invoke( $customizer ) );
	}

	/**
	 * Test add_section().
	 */
	public function test_add_section() {
		$test_data = static::$test_data['single_fields'];

		$mocked_wp_customize = Mockery::mock( 'WP_Customize_Manager' );
		global $wp_customize;
		$wp_customize = $mocked_wp_customize; // phpcs:ignore WordPress.Variables.GlobalVariables.OverrideProhibited -- Limited to test function scope.
		$mocked_wp_customize->shouldReceive( 'get_section' )->andReturn( true );

		Monkey\Functions\expect( 'beans_get_fields' )
		->with( 'wp_customize', $test_data['section'] )
		->once()
		->ordered()
		->andReturn( array() );

		Monkey\Functions\expect( 'beans_add_attribute' )
		->with( 'beans_field_label', 'class', 'customize-control-title' )
		->once()
		->andReturn( true );

		$customizer  = new \_Beans_WP_Customize( $test_data['section'], $test_data['args'] );
		$add_section = $this->get_reflective_method( 'add_section' );

		$this->assertNull( $add_section->invoke( $customizer, $wp_customize ) );
	}

	/**
	 * Test add_setting() calls beans_get().
	 */
	public function test_add_setting_calls_beans_get() {
		$test_data = static::$test_data['single_fields'];

		$mocked_wp_customize = Mockery::mock( 'WP_Customize_Manager' );
		global $wp_customize;
		$wp_customize = $mocked_wp_customize; // phpcs:ignore WordPress.Variables.GlobalVariables.OverrideProhibited -- Limited to test function scope.
		$mocked_wp_customize->shouldReceive( 'get_section', 'add_setting', 'add_section' )->andReturn( true );

		Monkey\Functions\expect( 'beans_get_fields' )
		->with( 'wp_customize', $test_data['section'] )
		->once()
		->ordered()
		->andReturn( array() );

		Monkey\Functions\expect( 'beans_get' )
		->once()
		->andReturn( 'default' );

		Monkey\Functions\expect( 'beans_add_attribute' )
		->with( 'beans_field_label', 'class', 'customize-control-title' )
		->once()
		->andReturn( true );

		$customizer  = new \_Beans_WP_Customize( $test_data['section'], $test_data['args'] );
		$add_setting = $this->get_reflective_method( 'add_setting' );

		$this->assertNull( $add_setting->invoke( $customizer, $wp_customize, $test_data['fields'] ) );
	}

	/**
	 * Test add_group_setting() with no grouped fields.
	 */
	public function test_add_group_setting_without_grouped_field() {
		$test_data = static::$test_data['single_fields'];

		$mocked_wp_customize = Mockery::mock( 'WP_Customize_Manager' );
		global $wp_customize;
		$wp_customize = $mocked_wp_customize; // phpcs:ignore WordPress.Variables.GlobalVariables.OverrideProhibited -- Limited to test function scope.
		$mocked_wp_customize->shouldReceive( 'get_section', 'add_setting', 'add_section' )->andReturn( true );

		Monkey\Functions\expect( 'beans_get_fields' )
		->with( 'wp_customize', $test_data['section'] )
		->once()
		->ordered()
		->andReturn( array() );

		Monkey\Functions\expect( 'beans_add_attribute' )
		->with( 'beans_field_label', 'class', 'customize-control-title' )
		->once()
		->andReturn( true );

		$customizer        = new \_Beans_WP_Customize( $test_data['section'], $test_data['args'] );
		$add_group_setting = $this->get_reflective_method( 'add_group_setting' );

		$this->assertNull( $add_group_setting->invoke( $customizer, $wp_customize, $test_data['fields'] ) );
	}

	/**
	 * Test add_group_setting()_with_group_fields().
	 */
	public function test_add_group_setting_with_grouped_fields() {
		$test_data = static::$test_data['group'];

		$mocked_wp_customize = Mockery::mock( 'WP_Customize_Manager' );
		global $wp_customize;
		$wp_customize = $mocked_wp_customize; // phpcs:ignore WordPress.Variables.GlobalVariables.OverrideProhibited -- Limited to test function scope.
		$mocked_wp_customize->shouldReceive( 'get_section', 'add_setting', 'add_section' )->andReturn( true );

		Monkey\Functions\expect( 'beans_get_fields' )
		->with( 'wp_customize', $test_data['section'] )
		->once()
		->ordered()
		->andReturn( array() );

		Monkey\Functions\expect( 'beans_get' )
		->times( 3 )
		->andReturn( 'default' );

		Monkey\Functions\expect( 'beans_add_attribute' )
		->with( 'beans_field_label', 'class', 'customize-control-title' )
		->once()
		->andReturn( true );

		$customizer        = new \_Beans_WP_Customize( $test_data['section'], $test_data['args'] );
		$add_group_setting = $this->get_reflective_method( 'add_group_setting' );

		$this->assertNull( $add_group_setting->invoke( $customizer, $wp_customize, $test_data['fields'] ) );
	}


	/**
	 * Test add_control().
	 */
	public function test_add_control() {
		$test_data = static::$test_data['single_fields'];

		$mocked_wp_customize = Mockery::mock( 'WP_Customize_Manager' );
		global $wp_customize;
		$wp_customize = $mocked_wp_customize; // phpcs:ignore WordPress.Variables.GlobalVariables.OverrideProhibited -- Limited to test function scope.
		$mocked_wp_customize->shouldReceive( 'get_section', 'add_setting', 'add_section', 'add_control' )->andReturn( true );

		$mocked_beans_customize_control = Mockery::mock( '_Beans_WP_Customize_Control' );

		Monkey\Functions\expect( 'beans_get_fields' )
		->with( 'wp_customize', $test_data['section'] )
		->once()
		->ordered()
		->andReturn( array() );

		Monkey\Functions\expect( 'beans_add_attribute' )
		->with( 'beans_field_label', 'class', 'customize-control-title' )
		->once()
		->andReturn( true );

		$customizer  = new \_Beans_WP_Customize( $test_data['section'], $test_data['args'] );
		$add_control = $this->get_reflective_method( 'add_control' );

		$this->assertNull( $add_control->invoke( $customizer, $wp_customize, $test_data['fields'] ) );
	}
}

In your gist, move the WP Customize mock code into setUp() like this:

	protected $wp_customize_mock;

	protected function setUp() {
		parent::setUp();

		$this->wp_customize_mock = Mockery::mock( 'WP_Customize_Manager' );
		global $wp_customize;
		$wp_customize = $this->wp_customize_mock; // phpcs:ignore WordPress.Variables.GlobalVariables.OverrideProhibited -- Limited to test function scope.
	}
}

Then you can use $this->wp_customize_mock throughout your tests.

import _Beans_WP_Customize via use _Beans_WP_Customize; Then you can get rid of the backslash in all of your tests to make it more readable like this:

$customizer        = new _Beans_WP_Customize( $test_data['section'], $test_data['args'] );

For the reflective method getter, take a look at the method in the Test_Case. Notice that it wants the method's name as the 1st argument and the class name as the 2nd argument.

Here in your tests, you would want to do it like this:

$add        = $this->get_reflective_method( 'add', '_Beans_WP_Customize' );

Of course, that assumes you have not overwritten the get_reflective_method in your test case, i.e. in WP_Customize_Test_Case.