build: install dev deps with wally

pkgs/charm-sync/tests/flatten.spec.luau

@@ -0,0 +1,28 @@
+local ReplicatedStorage = game:GetService("ReplicatedStorage")
+local ServerScriptService = game:GetService("ServerScriptService")
+
+local Charm = require(ReplicatedStorage.Packages.Charm)
+local CharmSync = require(ReplicatedStorage.Packages.CharmSync)
+local suite = require(ServerScriptService.Tests.suite)
+
+local atom = Charm.atom
+local flatten = CharmSync.flatten
+local test = suite.test
+
+test("should flatten atoms", function()
+	local input = {
+		a = atom(0),
+		b = { c = atom(0) },
+		d = { e = { f = atom(0) } },
+	}
+	local result = flatten(input)
+
+	assert(result.a == input.a)
+	assert(result["b/c"] == input.b.c)
+	assert(result["d/e/f"] == input.d.e.f)
+
+	assert(result.b == nil)
+	assert(result.d == nil)
+end)
+
+return {}