Add a header should not be equal to value option

src/Context/RestContext.php

@@ -112,6 +112,21 @@ public function theHeaderShouldBeEqualTo($name, $value)
         );
     }
 
+    /**
+    * Checks, whether the header name is not equal to given text
+    *
+    * @Then the header :name should not be equal to :value
+    */
+    public function theHeaderShouldNotBeEqualTo($name, $value) {
+        $actual = $this->getSession()->getResponseHeader($name);
+        if (strtolower($value) == strtolower($actual)) {
+            throw new ExpectationException(
+                "The header '$name' is equal to '$actual'",
+                $this->getSession()->getDriver()
+            );
+        }
+    }
+
     /**
      * Checks, whether the header name contains the given text
      *

tests/features/rest.feature

@@ -4,6 +4,7 @@ Feature: Testing RESTContext
         When I send a GET request to "rest/index.php"
         And the header "Content-Type" should contain "text"
         And the header "Content-Type" should be equal to "text/html; charset=UTF-8"
+        And the header "Content-Type" should not be equal to "x-test/no-such-type"
         And the header "Content-Type" should not contain "text/json"
         And the header "xxx" should not exist
         And the response should expire in the future