change test framework to use files for in and out (s-exp)

test/cases/conditional/if_else.tst

@@ -0,0 +1,12 @@
+if(0)
+  42
+else
+  667
+end
+-- -- --
+s(:list,  [s(:if, 
+  s(:condition, 
+    s(:int,  0)), 
+  s(:if_true, 
+    s(:int,  42)), 
+  s(:if_false,  [s(:int,  667)]))])

test/cases/conditional/if_else_expressions.tst

@@ -0,0 +1,24 @@
+if(3 > var)
+  Object.initialize(3)
+else
+  var.new(33)
+end
+-- -- --
+s(:list,  [s(:if, 
+  s(:condition, 
+    s(:operator,  ">", 
+      s(:int,  3), 
+      s(:name,  "var"))), 
+  s(:if_true, 
+    s(:call, 
+      s(:name,  "initialize"), 
+      s(:arguments, 
+        s(:int,  3)), 
+      s(:receiver, 
+        s(:module,  "Object")))), 
+  s(:if_false,  [s(:call, 
+  s(:name,  "new"), 
+  s(:arguments, 
+    s(:int,  33)), 
+  s(:receiver, 
+    s(:name,  "var")))]))])

test/cases/conditional/if_end.tst

@@ -0,0 +1,10 @@
+if(0)
+  42
+end
+-- -- --
+s(:list,  [s(:if, 
+  s(:condition, 
+    s(:int,  0)), 
+  s(:if_true, 
+    s(:int,  42)), 
+  s(:if_false,  nil))])

test/cases/conditional/if_end_expressions.tst

@@ -0,0 +1,17 @@
+if(3 > var)
+  Object.initialize(3)
+end
+-- -- --
+s(:list,  [s(:if, 
+  s(:condition, 
+    s(:operator,  ">", 
+      s(:int,  3), 
+      s(:name,  "var"))), 
+  s(:if_true, 
+    s(:call, 
+      s(:name,  "initialize"), 
+      s(:arguments, 
+        s(:int,  3)), 
+      s(:receiver, 
+        s(:module,  "Object")))), 
+  s(:if_false,  nil))])