--[[**
	ensure value is an Instance and it's ClassName matches the given ClassName

	@param className The class name to check for

	@returns A function that will return true iff the condition is passed
**--]]

function t.instanceOf(className, childTable)
	assert(t.string(className))

	local childrenCheck
	if childTable ~= nil then
		childrenCheck = t.children(childTable)
	end

	return function(value)
		local instanceSuccess, instanceErrMsg = t.Instance(value)
		if not instanceSuccess then
			return false, instanceErrMsg or ""
		end

		if value.ClassName ~= className then
			return false, string.format("%s expected, got %s", className, value.ClassName)
		end

		if childrenCheck then
			local childrenSuccess, childrenErrMsg = childrenCheck(value)
			if not childrenSuccess then
				return false, childrenErrMsg
			end
		end

		return true
	end
end

t.instance = t.instanceOf
