chore: auto-complete for __spec__.jsonc file (#23476)

This makes writing these tests a little easier.

tests/specs/README.md

@@ -76,9 +76,26 @@ a "steps" array.
 - `args` - A string (that will be spilt on whitespace into an args array) or an
   array of arguments.
 - `output` - Path to use to assert the output.
-- `clean` (boolean) - Whether to empty the deno_dir before running the step.
+- `cleanDenoDir` (boolean) - Whether to empty the deno_dir before running the
+  step.
 - `exitCode` (number) - Expected exit code.
 
+### Auto-complete
+
+To get auto-complete for these files, add the following to a local
+`.vscode/settings.json` file:
+
+```json
+{
+  "json.schemas": [{
+    "fileMatch": [
+      "__test__.jsonc"
+    ],
+    "url": "./tests/specs/schema.json"
+  }]
+}
+```
+
 ## `.out` files
 
 `.out` files are used to assert the output when running a test or test step.

tests/specs/schema.json

@@ -0,0 +1,90 @@
+{
+  "$id": "https://github.com/denoland/deno/blob/tests/specs/schema.json",
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "description": "Schema file for the __test__.jsonc files",
+  "required": [],
+  "title": "Deno internal spec test schema",
+  "type": "object",
+  "definitions": {
+    "single_test": {
+      "type": "object",
+      "required": ["args", "output"],
+      "properties": {
+        "args": {
+          "default": "",
+          "oneOf": [{
+            "type": "string"
+          }, {
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          }]
+        },
+        "cleanDenoDir": {
+          "type": "boolean"
+        },
+        "cwd": {
+          "type": "string"
+        },
+        "commandName": {
+          "type": "string"
+        },
+        "envs": {
+          "type": "object",
+          "additionalProperties": {
+            "type": "string"
+          }
+        },
+        "output": {
+          "type": "string"
+        },
+        "exitCode": {
+          "type": "integer"
+        }
+      }
+    }
+  },
+  "oneOf": [{
+    "required": ["steps"],
+    "properties": {
+      "tempDir": {
+        "type": "boolean"
+      },
+      "base": {
+        "type": "string"
+      },
+      "envs": {
+        "type": "object",
+        "additionalProperties": {
+          "type": "string"
+        }
+      },
+      "steps": {
+        "type": "array",
+        "items": {
+          "$ref": "#/definitions/single_test"
+        }
+      }
+    }
+  }, {
+    "allOf": [{
+      "properties": {
+        "tempDir": {
+          "type": "boolean"
+        },
+        "base": {
+          "type": "string"
+        },
+        "envs": {
+          "type": "object",
+          "additionalProperties": {
+            "type": "string"
+          }
+        }
+      }
+    }, {
+      "$ref": "#/definitions/single_test"
+    }]
+  }]
+}