File

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−local events = require "util.events";
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−
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−describe("util.events", function ()
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−	it("should export a new() function", function ()
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−		assert.is_function(events.new);
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−	end);
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−	describe("new()", function ()
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−		it("should return return a new events object", function ()
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−			local e = events.new();
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−			assert.is_function(e.add_handler);
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−			assert.is_function(e.remove_handler);
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−		end);
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−	end);
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−
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−	local e, h;
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−
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−
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−	describe("API", function ()
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−		before_each(function ()
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−			e = events.new();
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−			h = spy.new(function () end);
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−		end);
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−
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−		it("should call handlers when an event is fired", function ()
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−			e.add_handler("myevent", h);
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−			e.fire_event("myevent");
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−			assert.spy(h).was_called();
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−		end);
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−
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−		it("should not call handlers when a different event is fired", function ()
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−			e.add_handler("myevent", h);
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−			e.fire_event("notmyevent");
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−			assert.spy(h).was_not_called();
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−		end);
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−
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−		it("should pass the data argument to handlers", function ()
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−			e.add_handler("myevent", h);
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−			e.fire_event("myevent", "mydata");
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−			assert.spy(h).was_called_with("mydata");
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−		end);
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−
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−		it("should support non-string events", function ()
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−			local myevent = {};
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−			e.add_handler(myevent, h);
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−			e.fire_event(myevent, "mydata");
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−			assert.spy(h).was_called_with("mydata");
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−		end);
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−
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−		it("should call handlers in priority order", function ()
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−			local data = {};
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−			e.add_handler("myevent", function () table.insert(data, "h1"); end, 5);
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−			e.add_handler("myevent", function () table.insert(data, "h2"); end, 3);
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−			e.add_handler("myevent", function () table.insert(data, "h3"); end);
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−			e.fire_event("myevent", "mydata");
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−			assert.same(data, { "h1", "h2", "h3" });
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−		end);
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−
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−		it("should support non-integer priority values", function ()
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−			local data = {};
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−			e.add_handler("myevent", function () table.insert(data, "h1"); end, 1);
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−			e.add_handler("myevent", function () table.insert(data, "h2"); end, 0.5);
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−			e.add_handler("myevent", function () table.insert(data, "h3"); end, 0.25);
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−			e.fire_event("myevent", "mydata");
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−			assert.same(data, { "h1", "h2", "h3" });
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−		end);
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−
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−		it("should support negative priority values", function ()
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−			local data = {};
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−			e.add_handler("myevent", function () table.insert(data, "h1"); end, 1);
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−			e.add_handler("myevent", function () table.insert(data, "h2"); end, 0);
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−			e.add_handler("myevent", function () table.insert(data, "h3"); end, -1);
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−			e.fire_event("myevent", "mydata");
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−			assert.same(data, { "h1", "h2", "h3" });
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−		end);
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−
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−		it("should support removing handlers", function ()
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−			e.add_handler("myevent", h);
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−			e.fire_event("myevent");
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−			e.remove_handler("myevent", h);
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−			e.fire_event("myevent");
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−			assert.spy(h).was_called(1);
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−		end);
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−
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−		it("should support adding multiple handlers at the same time", function ()
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−			local ht = {
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−				myevent1 = spy.new(function () end);
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−				myevent2 = spy.new(function () end);
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−				myevent3 = spy.new(function () end);
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−			};
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−			e.add_handlers(ht);
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−			e.fire_event("myevent1");
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−			e.fire_event("myevent2");
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−			assert.spy(ht.myevent1).was_called();
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−			assert.spy(ht.myevent2).was_called();
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−			assert.spy(ht.myevent3).was_not_called();
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−		end);
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−
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−		it("should support removing multiple handlers at the same time", function ()
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−			local ht = {
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−				myevent1 = spy.new(function () end);
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−				myevent2 = spy.new(function () end);
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−				myevent3 = spy.new(function () end);
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−			};
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−			e.add_handlers(ht);
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−			e.remove_handlers(ht);
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−			e.fire_event("myevent1");
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−			e.fire_event("myevent2");
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−			assert.spy(ht.myevent1).was_not_called();
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−			assert.spy(ht.myevent2).was_not_called();
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−			assert.spy(ht.myevent3).was_not_called();
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−		end);
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−
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−		pending("should support adding handlers within an event handler")
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−		pending("should support removing handlers within an event handler")
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−
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−		it("should support getting the current handlers for an event", function ()
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−			e.add_handler("myevent", h);
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−			local handlers = e.get_handlers("myevent");
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−			assert.equal(h, handlers[1]);
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−		end);
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−
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−		describe("wrappers", function ()
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−			local w
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−			before_each(function ()
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−				w = spy.new(function (handlers, event_name, event_data)
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−					assert.is_function(handlers);
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−					assert.equal("myevent", event_name)
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−					assert.equal("abc", event_data);
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−					return handlers(event_name, event_data);
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−				end);
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−			end);
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−
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−			it("should get called", function ()
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−				e.add_wrapper("myevent", w);
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−				e.add_handler("myevent", h);
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−				e.fire_event("myevent", "abc");
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−				assert.spy(w).was_called(1);
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−				assert.spy(h).was_called(1);
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−			end);
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−
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−			it("should be removable", function ()
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−				e.add_wrapper("myevent", w);
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−				e.add_handler("myevent", h);
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−				e.fire_event("myevent", "abc");
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−				e.remove_wrapper("myevent", w);
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−				e.fire_event("myevent", "abc");
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−				assert.spy(w).was_called(1);
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−				assert.spy(h).was_called(2);
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−			end);
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−
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−			it("should allow multiple wrappers", function ()
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−				local w2 = spy.new(function (handlers, event_name, event_data)
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−					return handlers(event_name, event_data);
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−				end);
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−				e.add_wrapper("myevent", w);
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−				e.add_handler("myevent", h);
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−				e.add_wrapper("myevent", w2);
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−				e.fire_event("myevent", "abc");
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−				e.remove_wrapper("myevent", w);
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−				e.fire_event("myevent", "abc");
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−				assert.spy(w).was_called(1);
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−				assert.spy(w2).was_called(2);
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−				assert.spy(h).was_called(2);
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−			end);
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−
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−			it("should support a mix of global and event wrappers", function ()
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−				local w2 = spy.new(function (handlers, event_name, event_data)
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−					return handlers(event_name, event_data);
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−				end);
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−				e.add_wrapper(false, w);
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−				e.add_handler("myevent", h);
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−				e.add_wrapper("myevent", w2);
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−				e.fire_event("myevent", "abc");
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−				e.remove_wrapper(false, w);
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−				e.fire_event("myevent", "abc");
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−				assert.spy(w).was_called(1);
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−				assert.spy(w2).was_called(2);
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−				assert.spy(h).was_called(2);
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−			end);
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−		end);
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−
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−		describe("global wrappers", function ()
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−			local w
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−			before_each(function ()
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−				w = spy.new(function (handlers, event_name, event_data)
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−					assert.is_function(handlers);
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−					assert.equal("myevent", event_name)
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−					assert.equal("abc", event_data);
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−					return handlers(event_name, event_data);
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−				end);
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−			end);
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−
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−			it("should get called", function ()
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−				e.add_wrapper(false, w);
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−				e.add_handler("myevent", h);
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−				e.fire_event("myevent", "abc");
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−				assert.spy(w).was_called(1);
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−				assert.spy(h).was_called(1);
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−			end);
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−
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−			it("should be removable", function ()
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−				e.add_wrapper(false, w);
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−				e.add_handler("myevent", h);
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−				e.fire_event("myevent", "abc");
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−				e.remove_wrapper(false, w);
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−				e.fire_event("myevent", "abc");
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−				assert.spy(w).was_called(1);
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−				assert.spy(h).was_called(2);
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−			end);
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−		end);
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−	end);
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−end);