Merge tests into a larger file (part 1 of ∞) (#9318)

* merge actiontable tests

* merge arithm tests

* merge array tests

* merge assign tests

* merge bind tests

* merge casestmt tests

* merge closure tests

* merge cnt seq tests

* merge collections tests

* merge concept issues tests

* merge concept tests

* fix failing tests

* smaller outputs

Use `doAssert` where possible.

* fix wrong output

* split `tcomputedgoto`

* revert merging concepts

* fix failing test

tests/actiontable/tactiontable.nim

@@ -1,5 +1,8 @@
 discard """
-  output: "action 3 arg"
+  output: '''
+action 3 arg
+action 3 arg
+'''
 """
 
 import tables
@@ -17,10 +20,18 @@ proc action4(arg: string) =
   echo "action 4 ", arg
 
 var
-  actionTable = {
+  actionTable1 = {
     "A": action1,
     "B": action2,
     "C": action3,
     "D": action4}.toTable
 
-actionTable["C"]("arg")
+const
+  actionTable2 = {
+    "A": action1,
+    "B": action2,
+    "C": action3,
+    "D": action4}.toTable
+
+actionTable1["C"]("arg")
+actionTable2["C"]("arg")

tests/actiontable/tactiontable2.nim

@@ -1,27 +0,0 @@
-discard """
-  output: "action 3 arg"
-"""
-
-import tables
-
-proc action1(arg: string) =
-  echo "action 1 ", arg
-
-proc action2(arg: string) =
-  echo "action 2 ", arg
-
-proc action3(arg: string) =
-  echo "action 3 ", arg
-
-proc action4(arg: string) =
-  echo "action 4 ", arg
-
-const
-  actionTable = {
-    "A": action1,
-    "B": action2,
-    "C": action3,
-    "D": action4}.toTable
-
-actionTable["C"]("arg")
-