add context that checks the resonse headers

features/http-response.feature

@@ -0,0 +1,18 @@
+Feature: HTTP response
+
+  Scenario: Check http status code
+
+    When I am on "/"
+    Then the HTTP status should be 200
+
+    When I am on "/the-page-not-found"
+    Then the HTTP status should be 404
+
+  Scenario: Check http response headers
+
+    When I am on "/"
+    Then the HTTP headers should be:
+      | header        | value                    |
+      | Content-Type  | text/html; charset=UTF-8 |
+      | Connection    | close                    |
+      | Host          | 127.0.0.1:8080           |

features/plugins.feature

@@ -3,16 +3,16 @@ Feature: Get statuses of plugins
   Scenario: Get plugins
 
     When I login as the "administrator" role
-    Then plugins should be:
+    Then the plugins should be:
       | slug               | status   |
       | akismet            | inactive |
       | hello-dolly        | inactive |
       | wordpress-importer | active   |
 
-  Scenario Outline: Plugins should be installed.
+  Scenario Outline: Plugin should be installed.
 
     When I login as the "administrator" role
-    Then the "<slug>" plugins should be installed
+    Then the "<slug>" plugin should be installed
 
     Examples:
       | slug               |
@@ -23,21 +23,21 @@ Feature: Get statuses of plugins
   Scenario Outline: Plugins should be activated.
 
     When I login as the "administrator" role
-    Then the "<slug>" plugins should be activated
+    Then the "<slug>" plugin should be activated
 
     Examples:
       | slug               |
       | wordpress-importer |
 
-  Scenario: Plugins should not be installed.
+  Scenario: Plugin should not be installed.
 
     When I login as the "administrator" role
-    Then the "my-plugin" plugins should not be installed
+    Then the "my-plugin" plugin should not be installed
 
   Scenario Outline: Plugins should not be activated.
 
     When I login as the "administrator" role
-    Then the "<slug>" plugins should not be activated
+    Then the "<slug>" plugin should not be activated
 
     Examples:
       | slug               |

src/Context/RawWordPressContext.php

@@ -70,6 +70,17 @@ protected function get_http_status()
 		return intval( $session->getStatusCode() );
 	}
 
+	/**
+	 * Get http response headers from the current page.
+	 *
+	 * @return array HTTP response headers.
+	 */
+	protected function get_http_headers()
+	{
+		$session = $this->get_goutte_session();
+		return $session->getResponseHeaders();
+	}
+
 	/**
 	 * Log in into the WordPress
 	 *

src/Context/WordPressContext.php

@@ -13,7 +13,7 @@
 class WordPressContext extends RawWordPressContext
 {
 	/**
-	 * Save env to variable
+	 * Save env to variable.
 	 * Example: Given save env $WP_VERSION as {WP_VERSION}
 	 *
 	 * @Given /^save env \$(?P<env>[A-Z_]+) as \{(?P<var>[A-Z_]+)\}$/
@@ -39,22 +39,56 @@ public function the_http_status_should_be( $expect )
 		) );
 	}
 
+	/**
+	 * Check HTTP response headers.
+	 * Example:
+	 * Then the HTTP headers should be:
+     *   | header        | value                    |
+     *   | Content-Type  | text/html; charset=UTF-8 |
+     *   | Connection    | close                    |
+     *   | Host          | 127.0.0.1:8080           |
+	 *
+	 * @then /^the HTTP headers should be:$/
+	 */
+	public function the_http_headers_should_be( TableNode $table )
+	{
+		$headers = $this->get_http_headers();
+
+		foreach ( $table->getHash() as $row ) {
+			if ( ! empty( $headers[ $row['header'] ] ) ) {
+				$value = $headers[ $row['header'] ][0];
+				$this->assertSame( $row['value'], $value, sprintf(
+					'The value of "%1$s" header is "%1$s", but it should be "%3$s".',
+					$row['header'],
+					$value,
+					$row['value']
+				) );
+			} else {
+				throw new \Exception( sprintf(
+					'The value of "%1$s" header is empty, but it should be "%2$s".',
+					$row['header'],
+					$row['value']
+				) );
+			}
+		}
+	}
+
 	/**
 	 * Check status of plugins
 	 * Example:
-	 * Then there are plugins:
+	 * Then the plugins should be:
 	 * | slug               | status   |
 	 * | akismet            | inactive |
 	 * | hello-dolly        | inactive |
 	 * | wordpress-importer | active   |
 	 *
-	 * @then /^plugins should be:$/
+	 * @then /^the plugins should be:$/
 	 */
-	public function there_are_plugins( TableNode $table )
+	public function the_plugins_should_be( TableNode $table )
 	{
 		$plugins = $this->get_plugins();
 
-		foreach ($table->getHash() as $row) {
+		foreach ( $table->getHash() as $row ) {
 			if ( ! empty( $plugins[ $row['slug'] ] ) ) {
 				$status = $plugins[ $row['slug'] ]['status'];
 				$this->assertSame( $row['status'], $status, sprintf(
@@ -72,9 +106,9 @@ public function there_are_plugins( TableNode $table )
 	}
 
 	/**
-	 * Check status of plugins
+	 * Check status of plugins.
 	 *
-	 * @then /^the "(?P<slug>[^"]*)" plugins should be (?P<expect>(installed|activated))$/
+	 * @then /^the "(?P<slug>[^"]*)" plugin should be (?P<expect>(installed|activated))$/
 	 */
 	public function the_plugin_should_be( $slug, $expect )
 	{
@@ -97,9 +131,9 @@ public function the_plugin_should_be( $slug, $expect )
 	}
 
 	/**
-	 * Check status of plugins
+	 * Check status of plugins.
 	 *
-	 * @then /^the "(?P<slug>[^"]*)" plugins should not be (?P<expect>(installed|activated))$/
+	 * @then /^the "(?P<slug>[^"]*)" plugin should not be (?P<expect>(installed|activated))$/
 	 */
 	public function the_plugin_should_not_be( $slug, $expect )
 	{
@@ -122,7 +156,7 @@ public function the_plugin_should_not_be( $slug, $expect )
 	}
 
 	/**
-	 * Check the theme is activated
+	 * Check the theme is activated.
 	 * Example: Given the "twentysixteen" theme should be activated
 	 *
 	 * @Then /^the "(?P<theme>[^"]*)" theme should be activated$/
@@ -140,7 +174,7 @@ public function theme_should_be_activated( $theme )
 	}
 
 	/**
-	 * Check WordPress version
+	 * Check WordPress version.
 	 * Example: Given the WordPress version should be "4.6"
 	 *
 	 * @Given /^the WordPress version should be "(?P<version>[^"]*)"$/
@@ -174,7 +208,7 @@ public function wordpress_version_should_be( $version )
 	}
 
 	/**
-	 * Return exception if user is not logged in
+	 * Return exception if user is not logged-in.
 	 * Example: Then I should be logged in
 	 *
 	 * @Then I should be logged in
@@ -187,7 +221,7 @@ public function i_should_be_logged_in()
 	}
 
 	/**
-	 * Return exception if user is logged in
+	 * Return exception if user is logged-in.
 	 * Example: I should not be logged in
 	 *
 	 * @Then I should not be logged in