write tests for Callbacks

spec/lib/diaspora_federation/callbacks_spec.rb

@@ -0,0 +1,74 @@
+module DiasporaFederation
+  describe Callbacks do
+    subject(:callbacks) { Callbacks.new %i(some_event another_event) }
+
+    context "callbacks" do
+      it "defines a callback and calls it" do
+        callbacks.on(:some_event) do
+          "result"
+        end
+
+        expect(callbacks.trigger(:some_event)).to eq("result")
+      end
+
+      it "defines a callback with params and calls it" do
+        callbacks.on(:some_event) do |arg1, arg2|
+          "result: #{arg1}, #{arg2}"
+        end
+
+        expect(callbacks.trigger(:some_event, "foo", "bar")).to eq("result: foo, bar")
+      end
+    end
+
+    describe "#on" do
+      it "fails if an event is unknown" do
+        expect { callbacks.on(:unknown_event) {} }.to raise_error ArgumentError, "Undefined event unknown_event"
+      end
+
+      it "fails if an event is unknown" do
+        callbacks.on(:some_event) {}
+        expect { callbacks.on(:some_event) {} }.to raise_error ArgumentError, "Already defined event some_event"
+      end
+    end
+
+    describe "#trigger" do
+      it "fails if an event is unknown" do
+        expect { callbacks.trigger(:unknown_event) }.to raise_error ArgumentError, "Undefined event unknown_event"
+      end
+    end
+
+    describe "#definition_complete?" do
+      it "is false if nothing is defined" do
+        expect(callbacks.definition_complete?).to be_falsey
+      end
+
+      it "is false if not all events are defined" do
+        callbacks.on(:some_event) {}
+        expect(callbacks.definition_complete?).to be_falsey
+      end
+
+      it "is true if all events are defined" do
+        callbacks.on(:some_event) {}
+        callbacks.on(:another_event) {}
+        expect(callbacks.definition_complete?).to be_truthy
+      end
+    end
+
+    describe "#missing_handlers" do
+      it "contains all events if nothing isdefined" do
+        expect(callbacks.missing_handlers).to eq(%i(some_event another_event))
+      end
+
+      it "contains the missing events if not all events are defined" do
+        callbacks.on(:some_event) {}
+        expect(callbacks.missing_handlers).to eq(%i(another_event))
+      end
+
+      it "is empty if all events are defined" do
+        callbacks.on(:some_event) {}
+        callbacks.on(:another_event) {}
+        expect(callbacks.missing_handlers).to be_empty
+      end
+    end
+  end
+end