test mocha first (#1071)

Author: Fil

package.json

@@ -28,7 +28,7 @@
     "types/**/*.d.ts"
   ],
   "scripts": {
-    "test": "yarn test:typecheck && yarn test:lint && yarn readme:check && yarn test:mocha",
+    "test": "yarn test:mocha && yarn test:typecheck && yarn test:lint && yarn readme:check",
     "test:mocha": "mkdir -p test/output && mocha --conditions=mocha 'test/**/*-test.*' 'test/plot.js'",
     "test:lint": "eslint src test",
     "test:typecheck": "tsc --noEmit",