Support regex header matching

lib/airborne/request_expectations.rb

@@ -44,6 +44,10 @@ def expect_header_contains(key, content)
       expect_header_impl(key, content, true)
     end
 
+    def expect_header_matches(key, content)
+      expect_header_impl(key, content, false, true)
+    end
+
     def optional(hash)
       OptionalHashTypeExpectations.new(hash)
     end
@@ -58,11 +62,13 @@ def date
 
     private
 
-    def expect_header_impl(key, content, contains = nil)
+    def expect_header_impl(key, content, contains = nil, matches = nil)
       header = headers[key]
       if header
         if contains
           expect(header.downcase).to include(content.downcase)
+        elsif matches
+          expect(header.downcase).to match(content)
         else
           expect(header.downcase).to eq(content.downcase)
         end

spec/airborne/expectations/expect_header_matches_spec.rb

@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+describe 'expect header matches' do
+  it 'should ensure partial header match exists' do
+    mock_get('simple_get', 'Content-Type' => 'application/json')
+    get '/simple_get'
+    expect_header_matches(:content_type, /json/)
+  end
+
+  it 'should ensure header is present' do
+    mock_get('simple_get', 'Content-Type' => 'application/json')
+    get '/simple_get'
+    expect { expect_header_matches(:foo, /json/) }.to raise_error
+  end
+
+  it 'should ensure partial header is present' do
+    mock_get('simple_get', 'Content-Type' => 'application/json')
+    get '/simple_get'
+    expect { expect_header_matches(:content_type, /bar/) }.to raise_error
+  end
+end