message: npm clean:dependencies should include testbed
diff: "build:testbed": "cd source/testbed && npm run build",
  "clean": "concurrently \"npm run clean:backend\" \"npm run clean:frontend\" \"npm run clean:test\" \"npm run clean:legacy\" \"npm run clean:testbed\"",
  "clean:backend": "cd source/backend && npm run clean",
  - "clean:dependencies": "concurrently \"rimraf source/backend/node_modules\" \"rimraf source/frontend/node_modules\" \"rimraf source/test/node_modules\"",
  + "clean:dependencies": "concurrently \"rimraf source/backend/node_modules\" \"rimraf source/frontend/node_modules\" \"rimraf source/test/node_modules\" \"rimraf source/testbed/node_modules\"",
  "clean:frontend": "cd source/frontend && npm run clean",
  "clean:legacy": "concurrently \"rimraf lib\" \"rimraf source/common/lib\" \"rimraf source/common/node_modules\"",
  "clean:test": "cd source/test && npm run clean",
  