Jestjs Material UI-TypeError:（0，_capitalize.default）不是函数

在本地运行jest测试时，测试套件在尝试使用ThemeProvider装载组件时失败

不幸的是，我无法在回购协议中重现该问题。 我试图在沙箱中重现相同的行为，但该行为没有重现。 请参见此处的示例：

我使用的是react inl和@mui，在测试环境中它无法编译。抱怨

\u大写。默认值
不是函数，但是我检查了节点模块，该函数显然已导出。还尝试重新安装包，以确保文件未损坏

当试图装载虚拟dom中的元素以运行某些单元测试时，似乎发生了错误。使用浅层渲染进行快照测试效果很好

**错误的转储**
TypeError: (0 , _capitalize.default) is not a function
    at InputBase (/home/circleci/project/node_modules/@material-ui/core/InputBase/InputBase.js:453:96)
    at renderWithHooks (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:15108:18)
    at updateForwardRef (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:16746:20)
    at beginWork$1 (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:18522:16)
    at HTMLUnknownElement.callCallback (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:347:14)
    at invokeEventListeners (/home/circleci/project/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:193:27)
    at HTMLUnknownElementImpl._dispatch (/home/circleci/project/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:119:9)
    at HTMLUnknownElementImpl.dispatchEvent (/home/circleci/project/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:82:17)
    at HTMLUnknownElementImpl.dispatchEvent (/home/circleci/project/node_modules/jsdom/lib/jsdom/living/nodes/HTMLElement-impl.js:30:27)
    at HTMLUnknownElement.dispatchEvent (/home/circleci/project/node_modules/jsdom/lib/jsdom/living/generated/EventTarget.js:157:21)
    at Object.invokeGuardedCallbackDev (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:397:16)
    at invokeGuardedCallback (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:454:31)
    at beginWork$$1 (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:23217:7)
    at performUnitOfWork (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:22211:12)
    at workLoopSync (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:22185:22)
    at renderRoot (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:21878:11)
    at scheduleUpdateOnFiber (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:21419:22)
    at scheduleRootUpdate (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:24319:3)
    at updateContainerAtExpirationTime (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:24347:10)
    at updateContainer (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:24436:10)
    at /home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:24963:7
    at unbatchedUpdates (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:21687:12)
    at legacyRenderSubtreeIntoContainer (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:24962:5)
    at Object.render (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:25042:12)
    at fn (/home/circleci/project/node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:437:26)
    at /home/circleci/project/node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:354:37
    at batchedUpdates$1 (/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:21643:12)
    at act (/home/circleci/project/node_modules/react-dom/cjs/react-dom-test-utils.development.js:1002:14)
    at Object.act (/home/circleci/project/node_modules/react-dom/cjs/react-dom-test-utils.development.js:1418:12)
    at wrapAct (/home/circleci/project/node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:354:13)
    at Object.render (/home/circleci/project/node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:423:16)
    at new ReactWrapper (/home/circleci/project/node_modules/enzyme/src/ReactWrapper.js:115:16)
    at mount (/home/circleci/project/node_modules/enzyme/src/mount.js:10:10)
    at mountWithIntl (/home/circleci/project/test/intlHelper.js:22:10)
    at Suite.<anonymous> (/home/circleci/project/src/app/components/statisticsFilter.test.js:52:23)
    at addSpecsToSuite (/home/circleci/project/node_modules/jest-jasmine2/build/jasmine/Env.js:339:25)
    at Env.describe (/home/circleci/project/node_modules/jest-jasmine2/build/jasmine/Env.js:308:7)
    at describe (/home/circleci/project/node_modules/jest-jasmine2/build/jasmine/jasmine_light.js:99:18)
    at Object.<anonymous> (/home/circleci/project/src/app/components/statisticsFilter.test.js:26:1)
    at Runtime._execModule (/home/circleci/project/node_modules/jest-runtime/build/index.js:694:13)
    at Runtime.requireModule (/home/circleci/project/node_modules/jest-runtime/build/index.js:376:14)
    at /home/circleci/project/node_modules/jest-jasmine2/build/index.js:129:13
    at Generator.next (<anonymous>)
    at step (/home/circleci/project/node_modules/jest-jasmine2/build/index.js:170:30)
    at /home/circleci/project/node_modules/jest-jasmine2/build/index.js:189:14
    at new Promise (<anonymous>)
    at /home/circleci/project/node_modules/jest-jasmine2/build/index.js:167:12
    at jasmine2 (/home/circleci/project/node_modules/jest-jasmine2/build/index.js:138:17)
    at /home/circleci/project/node_modules/jest-runner/build/run_test.js:187:24
    at Generator.next (<anonymous>)
    at step (/home/circleci/project/node_modules/jest-runner/build/run_test.js:315:30)
    at /home/circleci/project/node_modules/jest-runner/build/run_test.js:326:15
    at process._tickCallback (internal/process/next_tick.js:68:7)

TypeError:（0，_capitalize.default）不是函数
在InputBase（/home/circleci/project/node_modules/@material ui/core/InputBase/InputBase.js:453:96）
在renderWithHooks（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:15108:18）
在updateForwardRef（/home/circleci/project/node_modules/react dom/cjs/react dom.development.js:16746:20）中
开始工作时$1（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:18522:16）
在htmlunknowneelement.callCallback（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:347:14）
在invokeEventListeners（/home/circleci/project/node_modules/jsdom/lib/jsdom/living/events/EventTarget impl.js:193:27）
在HTMLUnknownElementImpl.\u调度（/home/circleci/project/node\u modules/jsdom/lib/jsdom/living/events/EventTarget impl.js:119:9）
在HTMLUnknownElementImpl.dispatchEvent（/home/circleci/project/node_modules/jsdom/lib/jsdom/living/events/EventTarget impl.js:82:17）
在HTMLUnknownElementImpl.dispatchEvent（/home/circleci/project/node_modules/jsdom/lib/jsdom/living/nodes/HTMLElement impl.js:30:27）上
在HTMLUnknownElement.dispatchEvent（/home/circleci/project/node_modules/jsdom/lib/jsdom/living/generated/EventTarget.js:157:21）
在Object.invokeGuardedCallbackDev（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:397:16）
在invokeGuardedCallback（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:454:31）
开始工作时$$1（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:23217:7）
在执行工作时（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:22211:12）
在workLoopSync（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:22185:22）
在renderRoot（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:21878:11）
在scheduleUpdateOnFiber（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:21419:22）
在scheduleRootUpdate（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:24319:3）
在UpdateContainerExpirationTime（/home/circleci/project/node_modules/react dom/cjs/react dom.development.js:24347:10）
在updateContainer（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:24436:10）
at/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:24963:7
在未分段的更新中（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:21687:12）
在legacyRenderSubtreeIntoContainer（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:24962:5）
在Object.render（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:25042:12）
在fn（/home/circleci/project/node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:437:26）
at/home/circleci/project/node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:354:37
batchedUpdate$1（/home/circleci/project/node_modules/react-dom/cjs/react-dom.development.js:21643:12）
在act（/home/circleci/project/node_modules/react-dom/cjs/react-dom-test-utils.development.js:1002:14）
在Object.act（/home/circleci/project/node_modules/react-dom/cjs/react-dom-test-utils.development.js:1418:12）
在wrapAct（/home/circleci/project/node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:354:13）
在Object.render（/home/circleci/project/node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:423:16）
在新的ReactWrapper（/home/circleci/project/node_modules/enzyme/src/ReactWrapper.js:115:16）
挂载时（/home/circleci/project/node_modules/enzyme/src/mount.js:10:10）
在mountWithIntl（/home/circleci/project/test/intlHelper.js:22:10）
在套房。（/home/circleci/project/src/app/components/statisticsFilter.test.js:52:23）
在addSpecsToSuite（/home/circleci/project/node_modules/jest-jasmine2/build/jasmine/Env.js:339:25）
在Env.descripe（/home/circleci/project/node_modules/jest-jasmine2/build/jasmine/Env.js:308:7）
在description（/home/circleci/project/node_modules/jest-jasmine2/build/jasmine/jasmine_light.js:99:18）
反对。（/home/circleci/project/src/app/components/statisticsFilter.test.js:26:1）
运行时。_execModule（/home/circleci/project/node_modules/jest Runtime/build/index.js:694:13）
在Runtime.requireModule（/home/circleci/project/node_modules/jest Runtime/build/index.js:376:14）
at/home/circleci/project/node_modules/jest-jasmine2/build/index.js:129:13
在Generator.next（）处
步骤（/home/circleci/project/node_modules/jest-jasmine2/build/index.js:170:30）
at/home/circleci/project/node_modules/jest-jasmine2/build/index.js:189:14
在新的承诺（）
at/home/circleci/project/node_modules/jest-jasmine2/build/index.js:167:12
jasmine2（/home/circleci/project/node_modules/jest-jasmine2/build/index.js:138:17）
at/home/circleci/project/node_modules/jest runner/build/run_test.js:187:24
在Generator.next（）处
在步骤（/home/circlec