start building ast spec

spec/compiler_spec.moon

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+import Block from require "moonscript.compile"
+import ref from require "spec.factory"
+
+-- no transform step
+class SimpleBlock extends Block
+  new: (...) =>
+    super ...
+    @transform = {
+      value: (...) -> ...
+      statement: (...) -> ...
+    }
+
+value = require "moonscript.compile.value"
+
+describe "moonscript.compile", ->
+  compile_node = (node) ->
+    block = SimpleBlock!
+    block\add block\value node
+    lines = block._lines\flatten!
+    lines[#lines] = nil if lines[#lines] == "\n"
+    table.concat lines
+
+  -- compiling lua ast
+  describe "value", ->
+    for {name, node, expected} in *{
+      {
+        "ref"
+        -> {"ref", "hello_world"}
+        "hello_world"
+      }
+    }
+      it "compiles #{name}", ->
+        node = node!
+        assert.same expected, compile_node(node)
+
+

spec/factory.moon

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+
+-- ast factory
+
+ref = (name="val") ->
+  {"ref", name}
+
+{
+  :var
+}