Add way to run tests using my in-development vim debugger

tests/.vimspector.json

@@ -0,0 +1,21 @@
+{
+  "configurations": {
+    "Run test": {
+      "adapter": "vim-debug-adapter",
+      "configuration": {
+        "request": "launch",
+        "cwd": "${workspaceRoot}",
+        "env": {
+          "VIMSPECTOR_MIMODE": "lldb"
+        },
+        "args": [
+          "--clean",
+          "--not-a-term",
+          "-S", "lib/run_test.vim",
+          "${file}",
+          "${TestFunction}"
+        ]
+      }
+    }
+  }
+}

tests/lib/run_test.vim

@@ -36,7 +36,7 @@
 let s:single_test_timeout = 60000
 
 " Restrict the runtimepath to the exact minimum needed for testing
-let &rtp = getcwd() . '/lib'
+let &runtimepath = getcwd() . '/lib'
 set runtimepath+=$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after
 if has('packages')
   let &packpath = &runtimepath
@@ -71,7 +71,7 @@ func s:TestFailed()
 endfunc
 
 func! Abort( timer_id )
-  if exists( '&debugfunc' ) && &debugfunc != ''
+  if exists( '&debugfunc' ) && &debugfunc !=# ''
     return
   endif