add posmap matching specs

spec/error_rewriting_spec.moon

@@ -3,6 +3,8 @@ moonscript = require "moonscript.base"
 errors = require "moonscript.errors"
 util = require "moonscript.util"
 
+import unindent from require "spec.helpers"
+
 get_rewritten_line_no = (fname) ->
   fname = "spec/error_inputs/#{fname}.moon"
   chunk = moonscript.loadfile fname
@@ -28,3 +30,35 @@ describe "error rewriting", ->
     it "should rewrite line number", ->
       assert.same get_rewritten_line_no(name), expected_no
 
+describe "line map", ->
+  import to_lua from require "moonscript.base"
+
+  it "should create line table", ->
+    moon_code = unindent [[
+      print "hello world"
+      if something
+        print "cats"
+    ]]
+
+    lua_code, posmap = assert to_lua moon_code
+    -- print util.debug_posmap(posmap, moon_code, lua_code)
+    assert.same { 7, 29, 42, 27 }, posmap
+
+  it "should create line table for multiline string", ->
+    moon_code = unindent [[
+      print "one"
+      x = [==[
+        one
+        two
+        thre
+        yes
+        no
+      ]==]
+      print "two"
+    ]]
+
+    lua_code, posmap = assert to_lua moon_code
+    -- print util.debug_posmap(posmap, moon_code, lua_code)
+    assert.same {[1]: 7, [7]: 19, [8]: 63}, posmap
+
+