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-rw-r--r--spec/util_events_spec.lua212
1 files changed, 212 insertions, 0 deletions
diff --git a/spec/util_events_spec.lua b/spec/util_events_spec.lua
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+local events = require "util.events";
+
+describe("util.events", function ()
+ it("should export a new() function", function ()
+ assert.is_function(events.new);
+ end);
+ describe("new()", function ()
+ it("should return return a new events object", function ()
+ local e = events.new();
+ assert.is_function(e.add_handler);
+ assert.is_function(e.remove_handler);
+ end);
+ end);
+
+ local e, h;
+
+
+ describe("API", function ()
+ before_each(function ()
+ e = events.new();
+ h = spy.new(function () end);
+ end);
+
+ it("should call handlers when an event is fired", function ()
+ e.add_handler("myevent", h);
+ e.fire_event("myevent");
+ assert.spy(h).was_called();
+ end);
+
+ it("should not call handlers when a different event is fired", function ()
+ e.add_handler("myevent", h);
+ e.fire_event("notmyevent");
+ assert.spy(h).was_not_called();
+ end);
+
+ it("should pass the data argument to handlers", function ()
+ e.add_handler("myevent", h);
+ e.fire_event("myevent", "mydata");
+ assert.spy(h).was_called_with("mydata");
+ end);
+
+ it("should support non-string events", function ()
+ local myevent = {};
+ e.add_handler(myevent, h);
+ e.fire_event(myevent, "mydata");
+ assert.spy(h).was_called_with("mydata");
+ end);
+
+ it("should call handlers in priority order", function ()
+ local data = {};
+ e.add_handler("myevent", function () table.insert(data, "h1"); end, 5);
+ e.add_handler("myevent", function () table.insert(data, "h2"); end, 3);
+ e.add_handler("myevent", function () table.insert(data, "h3"); end);
+ e.fire_event("myevent", "mydata");
+ assert.same(data, { "h1", "h2", "h3" });
+ end);
+
+ it("should support non-integer priority values", function ()
+ local data = {};
+ e.add_handler("myevent", function () table.insert(data, "h1"); end, 1);
+ e.add_handler("myevent", function () table.insert(data, "h2"); end, 0.5);
+ e.add_handler("myevent", function () table.insert(data, "h3"); end, 0.25);
+ e.fire_event("myevent", "mydata");
+ assert.same(data, { "h1", "h2", "h3" });
+ end);
+
+ it("should support negative priority values", function ()
+ local data = {};
+ e.add_handler("myevent", function () table.insert(data, "h1"); end, 1);
+ e.add_handler("myevent", function () table.insert(data, "h2"); end, 0);
+ e.add_handler("myevent", function () table.insert(data, "h3"); end, -1);
+ e.fire_event("myevent", "mydata");
+ assert.same(data, { "h1", "h2", "h3" });
+ end);
+
+ it("should support removing handlers", function ()
+ e.add_handler("myevent", h);
+ e.fire_event("myevent");
+ e.remove_handler("myevent", h);
+ e.fire_event("myevent");
+ assert.spy(h).was_called(1);
+ end);
+
+ it("should support adding multiple handlers at the same time", function ()
+ local ht = {
+ myevent1 = spy.new(function () end);
+ myevent2 = spy.new(function () end);
+ myevent3 = spy.new(function () end);
+ };
+ e.add_handlers(ht);
+ e.fire_event("myevent1");
+ e.fire_event("myevent2");
+ assert.spy(ht.myevent1).was_called();
+ assert.spy(ht.myevent2).was_called();
+ assert.spy(ht.myevent3).was_not_called();
+ end);
+
+ it("should support removing multiple handlers at the same time", function ()
+ local ht = {
+ myevent1 = spy.new(function () end);
+ myevent2 = spy.new(function () end);
+ myevent3 = spy.new(function () end);
+ };
+ e.add_handlers(ht);
+ e.remove_handlers(ht);
+ e.fire_event("myevent1");
+ e.fire_event("myevent2");
+ assert.spy(ht.myevent1).was_not_called();
+ assert.spy(ht.myevent2).was_not_called();
+ assert.spy(ht.myevent3).was_not_called();
+ end);
+
+ pending("should support adding handlers within an event handler")
+ pending("should support removing handlers within an event handler")
+
+ it("should support getting the current handlers for an event", function ()
+ e.add_handler("myevent", h);
+ local handlers = e.get_handlers("myevent");
+ assert.equal(h, handlers[1]);
+ end);
+
+ describe("wrappers", function ()
+ local w
+ before_each(function ()
+ w = spy.new(function (handlers, event_name, event_data)
+ assert.is_function(handlers);
+ assert.equal("myevent", event_name)
+ assert.equal("abc", event_data);
+ return handlers(event_name, event_data);
+ end);
+ end);
+
+ it("should get called", function ()
+ e.add_wrapper("myevent", w);
+ e.add_handler("myevent", h);
+ e.fire_event("myevent", "abc");
+ assert.spy(w).was_called(1);
+ assert.spy(h).was_called(1);
+ end);
+
+ it("should be removable", function ()
+ e.add_wrapper("myevent", w);
+ e.add_handler("myevent", h);
+ e.fire_event("myevent", "abc");
+ e.remove_wrapper("myevent", w);
+ e.fire_event("myevent", "abc");
+ assert.spy(w).was_called(1);
+ assert.spy(h).was_called(2);
+ end);
+
+ it("should allow multiple wrappers", function ()
+ local w2 = spy.new(function (handlers, event_name, event_data)
+ return handlers(event_name, event_data);
+ end);
+ e.add_wrapper("myevent", w);
+ e.add_handler("myevent", h);
+ e.add_wrapper("myevent", w2);
+ e.fire_event("myevent", "abc");
+ e.remove_wrapper("myevent", w);
+ e.fire_event("myevent", "abc");
+ assert.spy(w).was_called(1);
+ assert.spy(w2).was_called(2);
+ assert.spy(h).was_called(2);
+ end);
+
+ it("should support a mix of global and event wrappers", function ()
+ local w2 = spy.new(function (handlers, event_name, event_data)
+ return handlers(event_name, event_data);
+ end);
+ e.add_wrapper(false, w);
+ e.add_handler("myevent", h);
+ e.add_wrapper("myevent", w2);
+ e.fire_event("myevent", "abc");
+ e.remove_wrapper(false, w);
+ e.fire_event("myevent", "abc");
+ assert.spy(w).was_called(1);
+ assert.spy(w2).was_called(2);
+ assert.spy(h).was_called(2);
+ end);
+ end);
+
+ describe("global wrappers", function ()
+ local w
+ before_each(function ()
+ w = spy.new(function (handlers, event_name, event_data)
+ assert.is_function(handlers);
+ assert.equal("myevent", event_name)
+ assert.equal("abc", event_data);
+ return handlers(event_name, event_data);
+ end);
+ end);
+
+ it("should get called", function ()
+ e.add_wrapper(false, w);
+ e.add_handler("myevent", h);
+ e.fire_event("myevent", "abc");
+ assert.spy(w).was_called(1);
+ assert.spy(h).was_called(1);
+ end);
+
+ it("should be removable", function ()
+ e.add_wrapper(false, w);
+ e.add_handler("myevent", h);
+ e.fire_event("myevent", "abc");
+ e.remove_wrapper(false, w);
+ e.fire_event("myevent", "abc");
+ assert.spy(w).was_called(1);
+ assert.spy(h).was_called(2);
+ end);
+ end);
+ end);
+end);
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