Add FakeIdp.reset! method to reset configuration state

lib/fake_idp.rb

@@ -18,4 +18,8 @@ def self.configuration
   def self.configure
     yield(configuration)
   end
+
+  def self.reset!
+    @configuration = nil
+  end
 end

spec/fake_idp_spec.rb

@@ -1,7 +1,7 @@
 require "spec_helper"
 
 describe FakeIdp do
-  describe "#configure" do
+  describe ".configure" do
     context 'valid configuration' do
       before do
         FakeIdp.configure do |config|
@@ -61,4 +61,39 @@
       end
     end
   end
+
+  describe ".reset!" do
+    before do
+      FakeIdp.configure do |config|
+        config.callback_url = "http://localhost.dev:3000/auth/saml/devidp/callback"
+        config.sso_uid = "12345"
+        config.username = "bobthessouser"
+        config.name_id = "[email protected]"
+        config.additional_attributes = { foo: "bar" }
+      end
+
+      FakeIdp.reset!
+    end
+
+    it "resets the callback_url" do
+      expect(FakeIdp.configuration.callback_url).
+        not_to eq("http://localhost.dev:3000/auth/saml/devidp/callback")
+    end
+
+    it "resets the sso_uid" do
+      expect(FakeIdp.configuration.sso_uid).not_to eq("12345")
+    end
+
+    it "resets the username" do
+      expect(FakeIdp.configuration.username).not_to eq("bobthessouser")
+    end
+
+    it "resets the name_id" do
+      expect(FakeIdp.configuration.name_id).not_to eq("[email protected]")
+    end
+
+    it "resets the additional_attributes" do
+      expect(FakeIdp.configuration.additional_attributes).not_to eq({ foo: "bar" })
+    end
+  end
 end