Commit 5d26288

@@ -19,6 +19,8 @@ module TFA
         ShowCommand.new(@storage)
       when "totp"
         TotpCommand.new(@storage)
+      else
+        UsageCommand.new(@storage)
       end
     end
   end

@@ -0,0 +1,15 @@
+module TFA
+  class UsageCommand
+    def initialize(storage)
+    end
+
+    def run(arguments)
+      <<-MESSAGE
+Try:
+  - tfa add develoment <secret>
+  - tfa show development
+  - tfa totp development
+      MESSAGE
+    end
+  end
+end

@@ -4,4 +4,5 @@ require "tfa/version"
 require "tfa/add_command"
 require "tfa/show_command"
 require "tfa/totp_command"
+require "tfa/usage_command"
 require "tfa/console"

@@ -3,14 +3,26 @@ module TFA
     subject { Console.new('testing') }
     let(:secret) { ::ROTP::Base32.random_base32 }
 
-    it "saves a new secret" do
-      subject.run(["add", "development", secret])
-      expect(subject.run(["show", "development"])).to eql(secret)
-    end
+    describe "#run" do
+      context "when adding a key" do
+        it "saves a new secret" do
+          subject.run(["add", "development", secret])
+          expect(subject.run(["show", "development"])).to eql(secret)
+        end
+      end
+
+      context "when getting a one time password" do
+        it "creates a totp for a certain key" do
+          subject.run(["add", "development", secret])
+          expect(subject.run(["totp", "development"])).to_not be_nil
+        end
+      end
 
-    it "creates a totp for a certain key" do
-      subject.run(["add", "development", secret])
-      expect(subject.run(["totp", "development"])).to_not be_nil
+      context "when running an unknown command" do
+        it "returns the usage" do
+          expect(subject.run([])).to_not be_nil
+        end
+      end
     end
   end
 end