Don't hook install function directly

This is cheating for the plugin, and might not catch issues with how
the function is hooked up.

Fixes #13

README.md

@@ -119,13 +119,6 @@ class My_Plugin_Uninstall_Test extends WP_Plugin_Uninstall_UnitTestCase {
 	 */
 	protected $plugin_file;
 
-	/**
-	 * The plugin's install function.
-	 *
-	 * @type callable $install_function
-	 */
-	protected $install_function = 'my_plugin_activate';
-
 	//
 	// Public methods.
 	//

bin/install-plugin.php

@@ -8,14 +8,11 @@
  */
 
 $plugin_file      = $argv[1];
-$install_function = $argv[2];
-$config_file_path = $argv[3];
-$is_multisite     = $argv[4];
+$config_file_path = $argv[2];
+$is_multisite     = $argv[3];
 
 require dirname( __FILE__ ) . '/bootstrap.php';
 
 require $plugin_file;
 
-add_action( 'activate_' . $plugin_file, $install_function );
-
-do_action( 'activate_' . $plugin_file, false );
+do_action( 'activate_' . plugin_basename( $plugin_file ), false );

includes/wp-plugin-uninstall-unittestcase.php

@@ -27,15 +27,6 @@ abstract class WP_Plugin_Uninstall_UnitTestCase extends WP_UnitTestCase {
 	 */
 	protected $plugin_file;
 
-	/**
-	 * The plugin's install function.
-	 *
-	 * @since 0.1.0
-	 *
-	 * @type callable $install_function
-	 */
-	protected $install_function;
-
 	/**
 	 * The plugin's uninstall function (if it has one).
 	 *
@@ -164,7 +155,6 @@ protected function install() {
 			WP_PHP_BINARY
 			. ' ' . escapeshellarg( dirname( dirname( __FILE__ ) ) . '/bin/install-plugin.php' )
 			. ' ' . escapeshellarg( $this->plugin_file )
-			. ' ' . escapeshellarg( $this->install_function )
 			. ' ' . escapeshellarg( $this->locate_wp_tests_config() )
 			. ' ' . (int) is_multisite()
 		);