1 files changed, 50 insertions, 0 deletions

diff --git a/spec/outputs/test/using_spec.lua b/spec/outputs/test/using_spec.lua
new file mode 100644
index 0000000..5c2f357
--- /dev/null
+++ b/spec/outputs/test/using_spec.lua
@@ -0,0 +1,50 @@
+return describe("using", function()
+        it("should prevent variable shadowing in assignment", function()
+                local tmp = 100
+                local i, k = 100, 50
+                local process
+                process = function(add)
+                        local tmp = tmp + add
+                        i = i + tmp
+                        k = k + tmp
+                end
+                process(22)
+                assert.same(i, 222)
+                assert.same(k, 172)
+                return assert.same(tmp, 100)
+        end)
+        it("should handle multiple variable names", function()
+                local a, b, c = 1, 2, 3
+                local process
+                process = function(sum)
+                        a = a + 1
+                        b = b + 2
+                        local c = sum + 100
+                end
+                process(10)
+                assert.same(a, 2)
+                assert.same(b, 4)
+                return assert.same(c, 3)
+        end)
+        it("should work with nil value", function()
+                local x = 1
+                local fn
+                fn = function(val)
+                        if val ~= nil then
+                                x = val
+                        end
+                end
+                fn(100)
+                assert.same(x, 100)
+                return assert.is_true(x ~= 1)
+        end)
+        return it("should work with function calls", function()
+                local count = 0
+                local fn
+                fn = function(n)
+                        count = count + n
+                end
+                fn(5)
+                return assert.same(count, 5)
+        end)
+end)