Add tests for plugin header requires check

tests/phpunit/testdata/plugins/test-plugin-header-requires-errors/load.php

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+<?php
+/**
+ * Plugin Name: Test Plugin Header Requires Errors
+ * Plugin URI: https://github.com/WordPress/plugin-check
+ * Description: Test plugin for the Plugin Header Requires check.
+ * Version: 1.0.0
+ * Author: WordPress Performance Team
+ * Author URI: https://make.wordpress.org/performance/
+ * License: GPLv2 or later
+ * License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * Text Domain: test-plugin-header-requires-errors
+ *
+ * @package test-plugin-header-requires-errors
+ */

tests/phpunit/testdata/plugins/test-plugin-header-requires-errors/readme.txt

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+=== Test Plugin Header Requires Errors ===
+
+Contributors:      plugin-check
+Tested up to:      6.1
+Stable tag:        1.0.0
+License:           GPLv2 or later
+License URI:       https://www.gnu.org/licenses/gpl-2.0.html
+Tags:              testing, security
+
+Plugin description.

tests/phpunit/testdata/plugins/test-plugin-header-requires-without-errors/load.php

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+<?php
+/**
+ * Plugin Name: Test Plugin Header Requires Without Errors
+ * Plugin URI: https://github.com/WordPress/plugin-check
+ * Description: Test plugin for the Plugin Header Requires check.
+ * Version: 1.0.0
+ * Author: WordPress Performance Team
+ * Author URI: https://make.wordpress.org/performance/
+ * License: GPLv2 or later
+ * License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * Text Domain: test-plugin-header-requires-without-errors
+ *
+ * @package test-plugin-header-requires-without-errors
+ */

tests/phpunit/testdata/plugins/test-plugin-header-requires-without-errors/readme.txt

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+=== Test Plugin Header Requires Without Errors ===
+
+Contributors:      plugin-check
+Tested up to:      6.1
+Requires at least: 6.0
+Requires PHP:      5.6
+Stable tag:        1.0.0
+License:           GPLv2 or later
+License URI:       https://www.gnu.org/licenses/gpl-2.0.html
+Tags:              testing, security
+
+Plugin description.
+

tests/phpunit/tests/Checker/Checks/Plugin_Header_Requires_Check_Tests.php

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+<?php
+/**
+ * Tests for the Plugin_Header_Requires_Check class.
+ *
+ * @package plugin-check
+ */
+
+use WordPress\Plugin_Check\Checker\Check_Context;
+use WordPress\Plugin_Check\Checker\Check_Result;
+use WordPress\Plugin_Check\Checker\Checks\Plugin_Header_Requires_Check;
+
+class Plugin_Header_Requires_Check_Tests extends WP_UnitTestCase {
+
+	public function test_run_with_errors() {
+		$check         = new Plugin_Header_Requires_Check();
+		$check_context = new Check_Context( UNIT_TESTS_PLUGIN_DIR . 'test-plugin-header-requires-errors/load.php' );
+		$check_result  = new Check_Result( $check_context );
+
+		$check->run( $check_result );
+
+		$errors   = $check_result->get_errors();
+		$warnings = $check_result->get_warnings();
+
+		$this->assertNotEmpty( $errors );
+		$this->assertArrayHasKey( 'load.php', $errors );
+		$this->assertEquals( 2, $check_result->get_error_count() );
+		$this->assertEmpty( $warnings );
+		$this->assertEquals( 0, $check_result->get_warning_count() );
+
+		$this->assertArrayHasKey( 0, $errors['load.php'] );
+		$this->assertArrayHasKey( 0, $errors['load.php'][0] );
+		$this->assertArrayHasKey( 'code', $errors['load.php'][0][0][0] );
+		$this->assertEquals( 'missing_plugin_header', $errors['load.php'][0][0][0]['code'] );
+		$this->assertArrayHasKey( 'code', $errors['load.php'][0][0][1] );
+		$this->assertEquals( 'missing_plugin_header', $errors['load.php'][0][0][1]['code'] );
+	}
+
+	public function test_run_without_errors() {
+		$check         = new Plugin_Header_Requires_Check();
+		$check_context = new Check_Context( UNIT_TESTS_PLUGIN_DIR . 'test-plugin-header-requires-without-errors/load.php' );
+		$check_result  = new Check_Result( $check_context );
+
+		$check->run( $check_result );
+
+		$errors   = $check_result->get_errors();
+		$warnings = $check_result->get_warnings();
+
+		$this->assertEmpty( $errors );
+		$this->assertEquals( 0, $check_result->get_error_count() );
+		$this->assertEmpty( $warnings );
+		$this->assertEquals( 0, $check_result->get_warning_count() );
+	}
+}