First unit test, still to get passing.

spec/unit/cacheForeverExpecation.js

@@ -2,8 +2,34 @@ var assert = require('chai').assert,
     cacheForeverExpectation = lib.require('cacheForeverExpectation');
 
 describe("when passed a value with no max-age", function() {
+    it("should throw an error", function() {
+        var runExpectation = cacheForeverExpectationWrapper("public,")
+        assert.throws(runExpectation, /The cache-control value \'public,\' should have contained a max-age./)
+    });
+});
 
+describe("when passed a value with no location", function() {
     it("should throw an error", function() {
-        assert.throws(function() { cacheForeverExpectation })
+        var runExpectation = cacheForeverExpectationWrapper(",max-age=5000")
+        assert.throws(runExpectation, /The cache-control value \',max-age=5000\' should have matched/)
+    });
+});
+
+describe("when passed a value with max-age at end", function() {
+    it("should not throw an error", function() {
+        var runExpectation = cacheForeverExpectationWrapper("public, max-age=5000")
+        assert.doesNotThrow(runExpectation)
     });
-});
+});
+
+var cacheForeverExpectationWrapper = function cacheForeverExpectationWrapper(cacheControlHeader) {
+    return function() { 
+        var fakeResponse = { 
+            headers: {
+                'cache-control': cacheControlHeader
+            }
+        };
+
+        cacheForeverExpectation("public", fakeResponse) 
+    }
+}