=htt #5 assertHeaderExists functions now behave in the same way

Information about missing header name or values not matching assertion are logged.

akka-http-testkit/src/main/scala/akka/http/javadsl/testkit/TestRouteResult.scala

@@ -177,14 +177,6 @@ abstract class TestRouteResult(_result: RouteResult, awaitAtMost: FiniteDuration
   def assertEntityAs[T <: AnyRef](unmarshaller: Unmarshaller[HttpEntity, T], expected: T): TestRouteResult =
     assertEqualsKind(expected, entity(unmarshaller), "entity")
 
-  /**
-   * Assert that a given header instance exists in the response.
-   */
-  def assertHeaderExists(expected: HttpHeader): TestRouteResult = {
-    assertTrue(response.headers.exists(_ == expected), s"Header $expected was missing.")
-    this
-  }
-
   /**
    * Assert that a header of the given type exists.
    */
@@ -217,6 +209,12 @@ abstract class TestRouteResult(_result: RouteResult, awaitAtMost: FiniteDuration
     this
   }
 
+  /**
+   * Assert that a given header instance exists in the response.
+   */
+  def assertHeaderExists(expected: HttpHeader): TestRouteResult =
+    assertHeaderExists(expected.name(), expected.value())
+
   @varargs def assertRejections(expectedRejections: Rejection*): TestRouteResult = {
     if (rejections.asScala == expectedRejections.toSeq) {
       this