test: use lute for tests

packages/vide-charm/src/__tests__/useSignalState.test.luau

@@ -0,0 +1,59 @@
+local Charm = require("../../Charm")
+local Vide = require("../../Vide")
+local VideCharm = require("../")
+local test = require("../../../../tests/test")
+
+test("tracks signal state", function()
+	local getState, setState = Charm.signal(0)
+	local source
+	local cleanup = Vide.root(function()
+		source = VideCharm.useSignalState(getState)
+	end)
+	assert(source() == 0, "should return 0")
+	setState(1)
+	assert(source() == 1, "should return 1")
+	cleanup()
+end)
+
+test("accepts a selector", function()
+	local getState, setState = Charm.signal(0)
+	local source
+	local cleanup = Vide.root(function()
+		source = VideCharm.useSignalState(function()
+			return 2 * getState()
+		end)
+	end)
+	assert(source() == 0, "should return 0")
+	setState(1)
+	assert(source() == 2, "should return 2")
+	cleanup()
+end)
+
+test("updates source in untracked", function()
+	local getOuter, setOuter = Charm.signal(nil :: any)
+	local getInner, setInner = Charm.signal(0)
+	local spyCalls = 0
+	local cleanup = Vide.root(function()
+		return Vide.show(VideCharm.useSignalState(getOuter), function()
+			-- Charm effects created in Vide scopes triggered by useSignalState might
+			-- incorrectly get treated as an inner effect in useSignalState. This test
+			-- ensures that doesn't happen.
+			Vide.cleanup(Charm.effect(function()
+				getInner()
+				spyCalls += 1
+			end))
+			return nil
+		end)
+	end)
+	assert(spyCalls == 0, "should not call spy initially")
+	setOuter(true)
+	assert(spyCalls == 1, "should call spy when visible")
+	setInner(1)
+	assert(spyCalls == 2, "spy should run when counter updates")
+	setOuter({}) -- set to a truthy value to trigger an outer effect re-run
+	setInner(2)
+	assert(spyCalls == 3, "spy should still run when counter updates")
+	cleanup()
+end)
+
+return {}