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local log = require "mason-core.log"
local match = require "luassert.match"
local spy = require "luassert.spy"
local EventEmitter = require "mason-core.EventEmitter"
local a = require "mason-core.async"
describe("EventEmitter", function()
it("should call registered event handlers", function()
local emitter = EventEmitter.init(setmetatable({}, { __index = EventEmitter }))
local my_event_handler = spy.new()
emitter:on("my:event", my_event_handler --[[@as fun()]])
emitter:emit("my:event", { table = "value" })
emitter:emit("my:event", 1337, 42)
assert.spy(my_event_handler).was_called(2)
assert.spy(my_event_handler).was_called_with(match.same { table = "value" })
assert.spy(my_event_handler).was_called_with(1337, 42)
end)
it("should call registered event handlers only once", function()
local emitter = EventEmitter.init(setmetatable({}, { __index = EventEmitter }))
local my_event_handler = spy.new()
emitter:once("my:event", my_event_handler --[[@as fun()]])
emitter:emit("my:event", { table = "value" })
emitter:emit("my:event", 1337, 42)
assert.spy(my_event_handler).was_called(1)
assert.spy(my_event_handler).was_called_with(match.same { table = "value" })
end)
it("should remove registered event handlers", function()
local emitter = EventEmitter.init(setmetatable({}, { __index = EventEmitter }))
local my_event_handler = spy.new() --[[@as fun()]]
emitter:on("my:event", my_event_handler)
emitter:once("my:event", my_event_handler)
emitter:off("my:event", my_event_handler)
emitter:emit("my:event", { table = "value" })
assert.spy(my_event_handler).was_called(0)
end)
it("should log errors in handlers", function()
spy.on(log, "fmt_warn")
local emitter = EventEmitter.init(setmetatable({}, { __index = EventEmitter }))
emitter:on("event", mockx.throws "My error.")
emitter:emit "event"
a.run_blocking(a.wait, vim.schedule)
assert.spy(log.fmt_warn).was_called(1)
assert
.spy(log.fmt_warn)
.was_called_with("EventEmitter handler failed for event %s with error %s", "event", "My error.")
end)
end)
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