Add 'check this plugin' link on the plugin list table

includes/Admin/Admin_Page.php

@@ -21,6 +21,7 @@ class Admin_Page {
 	 */
 	public function add_hooks() {
 		add_action( 'admin_menu', array( $this, 'add_page' ) );
+		add_filter( 'plugin_action_links', array( $this, 'filter_plugin_action_links' ), 10, 2 );
 	}
 
 	/**
@@ -69,6 +70,31 @@ private function get_available_plugins() {
 	public function render_page() {
 		$available_plugins = $this->get_available_plugins();
 
+		$selected_plugin_basename = filter_input( INPUT_GET, 'plugin', FILTER_SANITIZE_STRING );
+
 		require WP_PLUGIN_CHECK_PLUGIN_DIR_PATH . '/templates/admin-page.php';
 	}
+
+	/**
+	 * Adds "check this plugin" link in the plugins list table.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param array  $actions     List of actions.
+	 * @param string $plugin_file Plugin main file.
+	 * @return array The modified list of actions.
+	 */
+	public function filter_plugin_action_links( $actions, $plugin_file ) {
+
+		if ( current_user_can( 'activate_plugins' ) ) {
+
+			$actions[] = sprintf(
+				'<a href="%1$s">%2$s</a>',
+				esc_url( admin_url() . 'tools.php?page=plugin-check&plugin=' . $plugin_file ),
+				esc_html__( 'Check this plugin', 'plugin-check' )
+			);
+		}
+
+		return $actions;
+	}
 }

templates/admin-page.php

@@ -25,7 +25,7 @@
 				<select id="plugin-check__plugins" name="plugin_check_plugins">
 					<option><?php esc_html_e( 'Select Plugin', 'plugin-check' ); ?></option>
 					<?php foreach ( $available_plugins as $plugin_basename => $available_plugin ) { ?>
-						<option value="<?php echo esc_attr( $plugin_basename ); ?>">
+						<option value="<?php echo esc_attr( $plugin_basename ); ?>"<?php selected( $selected_plugin_basename, $plugin_basename ); ?>>
 							<?php echo esc_html( $available_plugin['Name'] ); ?>
 						</option>
 					<?php } ?>

tests/Admin/Admin_Page_Tests.php

@@ -23,6 +23,7 @@ public function set_up() {
 	public function test_add_hooks() {
 		$this->admin_page->add_hooks();
 		$this->assertEquals( 10, has_action( 'admin_menu', array( $this->admin_page, 'add_page' ) ) );
+		$this->assertEquals( 10, has_filter( 'plugin_action_links', array( $this->admin_page, 'filter_plugin_action_links' ) ) );
 	}
 
 	public function test_add_page() {
@@ -118,4 +119,30 @@ public function test_render_page_with_no_plugins() {
 		$this->assertStringContainsString( 'No plugins available.', $output );
 		$this->assertStringNotContainsString( '<select id="plugin-check__plugins"', $output );
 	}
+
+	public function test_filter_plugin_action_links() {
+
+		$base_file = plugin_basename( WP_PLUGIN_CHECK_MAIN_FILE );
+
+		$action_links = $this->admin_page->filter_plugin_action_links( array(), $base_file );
+		$this->assertEmpty( $action_links );
+
+		/** Administrator check */
+		$admin_user = self::factory()->user->create( array( 'role' => 'administrator' ) );
+
+		if ( is_multisite() ) {
+			grant_super_admin( $admin_user );
+		}
+		wp_set_current_user( $admin_user );
+		$action_links = $this->admin_page->filter_plugin_action_links( array(), $base_file );
+
+		$this->assertEquals(
+			sprintf(
+				'<a href="%1$s">%2$s</a>',
+				esc_url( admin_url() . 'tools.php?page=plugin-check&plugin=' . $base_file ),
+				esc_html__( 'Check this plugin', 'plugin-check' )
+			),
+			$action_links[0]
+		);
+	}
 }