new tester; all tests categorized

tests/object/toop.nim

@@ -0,0 +1,21 @@
+discard """
+  output: "b"
+"""
+
+type
+  TA = object of TObject
+    x, y: int
+  
+  TB = object of TA
+    z: int
+    
+  TC = object of TB
+    whatever: string
+  
+proc p(a: var TA) = echo "a"
+proc p(b: var TB) = echo "b"
+
+var c: TC
+
+p(c)
+