new tester; all tests categorized

tests/method/tmultim1.nim

@@ -0,0 +1,29 @@
+discard """
+  file: "tmultim1.nim"
+  output: "7"
+"""
+# Test multi methods
+
+type
+  Expression = ref object {.inheritable.}
+  Literal = ref object of Expression
+    x: int
+  PlusExpr = ref object of Expression
+    a, b: Expression
+    
+method eval(e: Expression): int = quit "to override!"
+method eval(e: Literal): int = return e.x
+method eval(e: PlusExpr): int = return eval(e.a) + eval(e.b)
+
+proc newLit(x: int): Literal =
+  new(result)
+  result.x = x
+  
+proc newPlus(a, b: Expression): PlusExpr =
+  new(result)
+  result.a = a
+  result.b = b
+
+echo eval(newPlus(newPlus(newLit(1), newLit(2)), newLit(4))) #OUT 7
+
+