improve test coverage

tests/exception/t13115.nim

@@ -1,18 +1,23 @@
-discard """
-  exitcode: 1
-  targets: "c js cpp"
-  matrix: "-d:debug; -d:release"
-  outputsub: ''' and works fine! [Exception]'''
-  disabled: openbsd
-"""
-#[
-disabled: openbsd: just for js
-]#
+const msg = "This char is `" & '\0' & "` and works fine!"
 
-# bug #13115
-
-template fn =
-  var msg = "This char is `" & '\0' & "` and works fine!"
-  raise newException(Exception, msg)
-# static: fn() # would also work
-fn()
+when defined nim_t13115:
+  # bug #13115
+  template fn =
+    raise newException(Exception, msg)
+  when defined nim_t13115_static:
+    static: fn()
+  fn()
+else:
+  import std/[osproc,strformat,os,strutils]
+  proc main =
+    const nim = getCurrentCompilerExe()
+    const file = currentSourcePath
+    for b in "c js cpp".split:
+      when defined(openbsd):
+        if b == "js": continue # xxx bug: pending #13115
+      for opt in ["-d:nim_t13115_static", ""]:
+        let cmd = fmt"{nim} r -b:{b} -d:nim_t13115 {opt} --hints:off {file}"
+        let (outp, exitCode) = execCmdEx(cmd)
+        doAssert msg in outp, cmd & "\n" & msg
+        doAssert exitCode == 1
+  main()