diff --git a/lib/cookie_extractor/browser_detector.rb b/lib/cookie_extractor/browser_detector.rb
index de67f05..17cef26 100644
--- a/lib/cookie_extractor/browser_detector.rb
+++ b/lib/cookie_extractor/browser_detector.rb
@@ -4,13 +4,14 @@ module CookieExtractor
   class NoCookieFileFoundException < Exception; end
 
   class BrowserDetector
+    attr_reader :cookie_locations
+
     @cookie_locations = {
       "chrome" => "~/.config/google-chrome/Default/Cookies",
       "chromium" => "~/.config/chromium/Default/Cookies",
       "firefox" => "~/.mozilla/firefox/*.default/cookies.sqlite"
     }
 
-
     # Returns the extractor of the most recently used browser's cookies
     #   or raise NoCookieFileFoundException if there are no cookies
     def self.guess
diff --git a/spec/browser_detector_spec.rb b/spec/browser_detector_spec.rb
index 179cd5b..c01cd4c 100644
--- a/spec/browser_detector_spec.rb
+++ b/spec/browser_detector_spec.rb
@@ -40,4 +40,26 @@ describe CookieExtractor::BrowserDetector, "determining the correct extractor to
       extractor.instance_of?(CookieExtractor::ChromeCookieExtractor).should be_true
     end
   end
+
+  describe "when no cookie files are found in the standard locations" do
+    before :each do
+      Dir.stub!(:glob).and_return([])
+    end
+
+    it "should raise NoCookieFileFoundException" do
+      lambda { CookieExtractor::BrowserDetector.guess }.
+        should raise_error(CookieExtractor::NoCookieFileFoundException)
+    end
+  end
+
+  describe "when multiple cookie files are found in the standard locations" do
+    before :each do
+      Dir.stub!(:glob).and_return(CookieExtractor::BrowserDetector.cookie_locations.values)
+    end
+
+    it "should return a ChromeCookieExtractor or FirefoxCookieExtractor" do
+      lambda { CookieExtractor::BrowserDetector.guess }.
+        should be_kind_of(CookieExtractor::Common)
+    end
+  end
 end