a start on conditionals

test/vool/test_if_statement.rb

@@ -0,0 +1,54 @@
+require_relative 'helper'
+
+module Vool
+  class TestIfStatement < MiniTest::Test
+
+    def basic_if
+      "if(10 < 12) ; true ; end"
+    end
+
+    def test_if_basic
+      lst = Compiler.compile( basic_if )
+      assert_equal IfStatement , lst.class
+    end
+
+    def test_if_basic_cond
+      lst = Compiler.compile( basic_if )
+      assert_equal SendStatement , lst.condition.class
+    end
+    def test_if_basic_branches
+      lst = Compiler.compile( basic_if )
+      assert_equal TrueStatement , lst.if_true.class
+      assert_nil lst.if_false
+    end
+
+    def pest_if_basicr
+      @input = s(:statements, s(:if_statement, :plus, s(:condition, s(:operator_value, :-, s(:int, 10), s(:int, 12))), s(:true_statements, s(:return, s(:int, 3))), s(:false_statements, s(:return, s(:int, 4)))))
+
+    @expect =  [Label, LoadConstant, LoadConstant, OperatorInstruction, IsPlus, LoadConstant ,
+                 RegToSlot, Branch, Label, LoadConstant, RegToSlot, Label ,
+                 LoadConstant, SlotToReg, RegToSlot, Label, FunctionReturn]
+    assert_nil msg = check_nil , msg
+    end
+
+
+    def pest_if_small_minus
+      @input = s(:statements, s(:if_statement, :minus, s(:condition, s(:operator_value, :-, s(:int, 10), s(:int, 12))), s(:true_statements, s(:return, s(:int, 3))), s(:false_statements, nil)))
+
+    @expect = [Label, LoadConstant, LoadConstant, OperatorInstruction, IsMinus, Branch ,
+                 Label, LoadConstant, RegToSlot, Label, LoadConstant, SlotToReg ,
+                 RegToSlot, Label, FunctionReturn]
+    assert_nil msg = check_nil , msg
+    end
+
+
+    def pest_if_small_zero
+      @input = s(:statements, s(:if_statement, :zero, s(:condition, s(:operator_value, :-, s(:int, 10), s(:int, 12))), s(:true_statements, s(:return, s(:int, 3))), s(:false_statements, nil)))
+
+    @expect =  [Label, LoadConstant, LoadConstant, OperatorInstruction, IsZero, Branch ,
+                 Label, LoadConstant, RegToSlot, Label, LoadConstant, SlotToReg ,
+                 RegToSlot, Label, FunctionReturn]
+    assert_nil msg = check_nil , msg
+    end
+  end
+end