only rm cache

Author: mbostock

package.json

@@ -25,7 +25,7 @@
     "dev": "tsx watch ./src/preview.ts",
     "build": "rm -rf dist && ./bin/observable.ts build",
     "test": "yarn test:mocha && yarn test:lint",
-    "test:mocha": "rm -rf test/.observablehq && tsx ./node_modules/.bin/mocha 'test/**/*-test.*'",
+    "test:mocha": "rm -rf test/.observablehq/cache && tsx ./node_modules/.bin/mocha 'test/**/*-test.*'",
     "test:lint": "eslint src test public"
   },
   "dependencies": {