add some node transform specs

spec/transform_spec.moon

@@ -1,11 +1,107 @@
 
 import with_dev from require "spec.helpers"
 
+
 describe "moonscript.transform.destructure", ->
-  local extract_assign_names
+  local extract_assign_names, split_assign, Block
 
   with_dev ->
-    { :extract_assign_names } = require "moonscript.transform.destructure"
+    { :extract_assign_names, :split_assign } = require "moonscript.transform.destructure"
+    {:Block} = require "moonscript.compile"
+
+  describe "split_assign #fff", ->
+    -- {:hello} = world
+    it "simple assignment", ->
+      node = {
+        "assign"
+        {
+          { "table", {
+              {{"key_literal", "hello"}, {"ref", "hello"}}
+            }
+          }
+        }
+        {
+          {"ref", "world"}
+        }
+      }
+
+      out = split_assign Block!, node
+
+      assert.same {
+        "group", {
+          {
+            "group", {
+              { "declare", { {"ref", "hello"} } }
+              { "assign", { {"ref", "hello"} }, { {"chain", {"ref", "world"}, {"dot", "hello"}} } }
+            }
+          }
+        }
+      }, out
+
+    -- a, {:hello} = one, two
+    it "multiple assigns", ->
+      node = {
+        "assign"
+        {
+          {"ref", "a"}
+          { "table", {
+              {{"key_literal", "hello"}, {"ref", "hello"}}
+            }
+          }
+        }
+        {
+          {"ref", "one"}
+          {"ref", "two"}
+        }
+      }
+
+      out = split_assign Block!, node
+
+      assert.same {
+        "group", {
+          {"assign", { {"ref", "a"} }, { {"ref", "one"} }}
+
+          {
+            "group", {
+              { "declare", { {"ref", "hello"} } }
+              { "assign", { {"ref", "hello"} }, { {"chain", {"ref", "two"}, {"dot", "hello"}} } }
+            }
+          }
+        }
+      }, out
+
+    -- {:hello}, a = one, two
+    it "multiple assigns swapped #ddd", ->
+      node = {
+        "assign"
+        {
+          { "table", {
+              {{"key_literal", "hello"}, {"ref", "hello"}}
+            }
+          }
+          {"ref", "a"}
+        }
+        {
+          {"ref", "one"}
+          {"ref", "two"}
+        }
+      }
+
+      out = split_assign Block!, node
+
+      assert.same {
+        "group", {
+          {
+            "group", {
+              { "declare", { {"ref", "hello"} } }
+              { "assign", { {"ref", "hello"} }, { {"chain", {"ref", "one"}, {"dot", "hello"}} } }
+            }
+          }
+
+          {"assign", { {"ref", "a"} }, { {"ref", "two"} }}
+        }
+      }, out
+
 
   it "extracts names from table destructure", ->
     des = {