Added 2 matchers for headers

CHANGELOG.md

@@ -1,5 +1,10 @@
 # OHHTTPStubs — CHANGELOG
 
+## Master
+
+* Added matchers that check whether a request has a particular header present, and a matcher to check if a request has a header with a key and value.  
+  [@hq-mobile](https://github.com/hq-mobile), [#160](https://github.com/AliSoftware/OHHTTPStubs/pull/160)
+
 ## [4.8.0](https://github.com/AliSoftware/OHHTTPStubs/releases/tag/4.8.0)
 
 * Added `isEnabled` and `isEnabledForSessionConfiguration` getter methods.  

OHHTTPStubs/Sources/Swift/OHHTTPStubsSwift.swift

@@ -190,7 +190,31 @@ public func containsQueryParams(params: [String:String?]) -> OHHTTPStubsTestBloc
     }
 }
 
+/**
+ * Matcher testing that the `NSURLRequest` headers contain a specific key
+ * - Parameter name: the name of the key to search for in the `NSURLRequest`'s **allHTTPHeaderFields** property
+ *  
+ * - Returns: a matcher that returns true if the `NSURLRequest`'s headers contain a value for the key name
+ */
+public func hasHeaderNamed(name: String) -> OHHTTPStubsTestBlock {
+    return { (req: NSURLRequest) -> Bool in
+        return req.valueForHTTPHeaderField(name) != nil
+    }
+}
 
+/**
+ * Matcher testing that the `NSURLRequest` headers contain a specific key and the key's value is equal to the parameter value
+ * - Parameter name: the name of the key to search for in the `NSURLRequest`'s **allHTTPHeaderFields** property
+ * - Parameter value: the value to compare against the header's value
+ *  
+ * - Returns: a matcher that returns true if the `NSURLRequest`'s headers contain a value for the key name and it's value
+ *            is equal to the parameter value
+ */
+public func hasHeaderNamed(name: String, value: String) -> OHHTTPStubsTestBlock {
+    return { (req: NSURLRequest) -> Bool in
+        return req.valueForHTTPHeaderField(name) == value
+    }
+}
 
 // MARK: Operators on OHHTTPStubsTestBlock
 

OHHTTPStubs/UnitTests/Test Suites/SwiftHelpersTests.swift

@@ -155,6 +155,49 @@ class SwiftHelpersTests : XCTestCase {
       XCTAssert(matcher(req) == result, "containsQueryParams(\"\(params)\") matcher failed when testing url \(url)")
     }
   }
+
+  func testHasHeaderNamedIsTrue() {
+    let req = NSMutableURLRequest(URL: NSURL(string: "foo://bar")!)
+    req.addValue("1234567890", forHTTPHeaderField: "ArbitraryKey")
+
+    let hasHeader = hasHeaderNamed("ArbitraryKey")(req)
+
+    XCTAssertTrue(hasHeader)
+  }
+
+  func testHasHeaderNamedIsFalse() {
+    let req = NSMutableURLRequest(URL: NSURL(string: "foo://bar")!)
+
+    let hasHeader = hasHeaderNamed("ArbitraryKey")(req)
+
+    XCTAssertFalse(hasHeader)
+  }
+
+  func testHeaderValueForKeyEqualsIsTrue() {
+    let req = NSMutableURLRequest(URL: NSURL(string: "foo://bar")!)
+    req.addValue("bar", forHTTPHeaderField: "foo")
+
+    let matchesHeader = hasHeaderNamed("foo", value: "bar")(req)
+
+    XCTAssertTrue(matchesHeader)
+  }
+
+  func testHeaderValueForKeyEqualsIsFalse() {
+    let req = NSMutableURLRequest(URL: NSURL(string: "foo://bar")!)
+    req.addValue("bar", forHTTPHeaderField: "foo")
+
+    let matchesHeader = hasHeaderNamed("foo", value: "baz")(req)
+
+    XCTAssertFalse(matchesHeader)
+  }
+
+  func testHeaderValueForKeyEqualsDoesNotExist() {
+    let req = NSMutableURLRequest(URL: NSURL(string: "foo://bar")!)
+
+    let matchesHeader = hasHeaderNamed("foo", value: "baz")(req)
+
+    XCTAssertFalse(matchesHeader)
+  }
 
   let sampleURLs = [
     // Absolute URLs