diff --git a/.gitignore b/.gitignore
index 890fa322..34e024f8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 node_modules
 extension
+extension.zip
 artifacts/
+coverage
diff --git a/.prettierignore b/.prettierignore
index af66bf58..3fbe9d36 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1 +1,2 @@
 extension
+coverage
diff --git a/package.json b/package.json
index 631b62df..610bf6ea 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,8 @@
     "@babel/plugin-transform-modules-commonjs": "7.10.4",
     "@babel/preset-react": "7.10.4",
     "@svgr/webpack": "5.4.0",
+    "@testing-library/dom": "6.10.1",
+    "@testing-library/jest-dom": "4.2.0",
     "archiver": "5.0.0",
     "babel-loader": "8.1.0",
     "babel-plugin-transform-react-remove-prop-types": "0.4.24",
@@ -41,9 +43,11 @@
     "css-loader": "4.2.2",
     "eslint": "7.7.0",
     "eslint-config-prettier": "6.11.0",
+    "eslint-plugin-jest-dom": "1.3.0",
     "eslint-plugin-prettier": "3.1.4",
     "eslint-plugin-react": "7.20.6",
     "eslint-plugin-react-hooks": "4.1.0",
+    "eslint-plugin-testing-library": "1.3.2",
     "fs-extra": "9.0.1",
     "html-webpack-plugin": "4.3.0",
     "husky": "4.2.5",
@@ -68,5 +72,8 @@
     "hooks": {
       "pre-commit": "lint-staged"
     }
+  },
+  "jest": {
+    "collectCoverage": true
   }
 }
diff --git a/src/__mocks__/webextension-polyfill.js b/src/__mocks__/webextension-polyfill.js
new file mode 100644
index 00000000..f762214e
--- /dev/null
+++ b/src/__mocks__/webextension-polyfill.js
@@ -0,0 +1,28 @@
+const listeners = [];
+let storageItems = {};
+
+function callListeners() {
+  for (const listener of listeners) {
+    listener();
+  }
+}
+
+export default {
+  storage: {
+    onChanged: {
+      addListener(listener) {
+        listeners.push(listener);
+      },
+    },
+    sync: {
+      async get() {
+        return storageItems;
+      },
+      async set(newItems) {
+        await Promise.resolve();
+        storageItems = { ...storageItems, ...newItems };
+        callListeners();
+      },
+    },
+  },
+};
diff --git a/src/content/.eslintrc.json b/src/content/.eslintrc.json
new file mode 100644
index 00000000..58faf3eb
--- /dev/null
+++ b/src/content/.eslintrc.json
@@ -0,0 +1,11 @@
+{
+  "overrides": [
+    {
+      "files": "*test*.js",
+      "extends": [
+        "plugin:jest-dom/recommended",
+        "plugin:testing-library/recommended"
+      ]
+    }
+  ]
+}
diff --git a/src/content/button.test.js b/src/content/button.test.js
new file mode 100644
index 00000000..00c5bfd0
--- /dev/null
+++ b/src/content/button.test.js
@@ -0,0 +1,30 @@
+import "./testUtils";
+import renderButton from "./button";
+
+const buttonRef = {};
+const element = document.createElement("div");
+
+beforeEach(() => (document.body.innerHTML = ""));
+
+test.each([
+  [{}, [element, buttonRef]],
+  [{ append: false }, [buttonRef, element]],
+  [{ refNode: element }, [buttonRef, element]],
+])("renderButton with %p", (positionOptions, expectedOrder) => {
+  document.body.appendChild(element);
+  buttonRef.current = renderButton(document.body, {
+    classes: ["btn2"],
+    style: { color: "blue" },
+    ...positionOptions,
+  });
+
+  expect(Array.from(document.body.childNodes)).toEqual(
+    expectedOrder.map((thing) => thing.current || thing)
+  );
+  expect(buttonRef.current).toBeInstanceOf(HTMLButtonElement);
+  expect(buttonRef.current).toHaveTextContent("Prettier");
+  expect(buttonRef.current).toHaveAttribute("type", "button");
+  expect(buttonRef.current).toHaveClass("btn", "btn2");
+  expect(buttonRef.current).toHaveStyle("color: blue;");
+  expect(buttonRef.current).toBeInTheDocument();
+});
diff --git a/src/content/domUtils.test.js b/src/content/domUtils.test.js
new file mode 100644
index 00000000..c0f76625
--- /dev/null
+++ b/src/content/domUtils.test.js
@@ -0,0 +1,21 @@
+import { findWithClass, isElementVisible } from "./domUtils";
+import renderButton from "./button";
+
+test("findWithClass", () => {
+  const prettierButton = renderButton(document.body);
+  expect(findWithClass(prettierButton, "comment-form-textarea")).toBeNull();
+
+  // Basis: https://github.com/prettier/prettier-chrome-extension/issues/new
+  const textarea = document.createElement("textarea");
+  textarea.className = "comment-form-textarea";
+  document.body.appendChild(textarea);
+  expect(findWithClass(prettierButton, "comment-form-textarea")).toBe(textarea);
+});
+
+test("isElementVisible", () => {
+  const element = document.createElement("div");
+  expect(isElementVisible(element)).toBeFalsy();
+
+  Object.defineProperty(element, "offsetHeight", { value: 1 });
+  expect(isElementVisible(element)).toBeTruthy();
+});
diff --git a/src/content/extension.test.js b/src/content/extension.test.js
new file mode 100644
index 00000000..cc8b8642
--- /dev/null
+++ b/src/content/extension.test.js
@@ -0,0 +1,8 @@
+import "./testUtils";
+import Extension from "./extension";
+import { queryByText } from "@testing-library/dom";
+
+test("Extension", async () => {
+  await new Extension().init();
+  expect(queryByText(document, "Prettier")).not.toBeInTheDocument();
+});
diff --git a/src/content/github.test.js b/src/content/github.test.js
new file mode 100644
index 00000000..63a23e43
--- /dev/null
+++ b/src/content/github.test.js
@@ -0,0 +1,21 @@
+import { createStorage, expectToFormat } from "./testUtils";
+import GitHub from "./github";
+
+test("GitHub", async () => {
+  // Basis: https://github.com/prettier/prettier-chrome-extension/issues/new
+  const button = document.createElement("button");
+  button.innerText = "Comment";
+  document.body.appendChild(button);
+  const textarea = document.createElement("textarea");
+  textarea.className = "comment-form-textarea";
+  document.body.appendChild(textarea);
+  // Hack around JSDOM's lack of offsetHeight support to fix isElementVisible
+  Object.defineProperty(document.body, "offsetHeight", { value: 1 });
+  // Emulate a matching GitHub pathname
+  Object.defineProperty(window, "location", {
+    value: { pathname: "/prettier/prettier-chrome-extension/issues/new" },
+  });
+
+  new GitHub(await createStorage());
+  expectToFormat(textarea);
+});
diff --git a/src/content/stackOverflow.test.js b/src/content/stackOverflow.test.js
new file mode 100644
index 00000000..36623579
--- /dev/null
+++ b/src/content/stackOverflow.test.js
@@ -0,0 +1,15 @@
+import { createStorage, expectToFormat } from "./testUtils";
+import StackOverflow from "./stackOverflow";
+
+test("Stack Overflow", async () => {
+  // Basis: https://stackoverflow.com/questions/51875054
+  const button = document.createElement("div");
+  button.className = "wmd-button-row";
+  document.body.appendChild(button);
+  const textarea = document.createElement("textarea");
+  textarea.className = "wmd-input";
+  document.body.appendChild(textarea);
+
+  new StackOverflow(await createStorage());
+  expectToFormat(textarea);
+});
diff --git a/src/content/storage.test.js b/src/content/storage.test.js
new file mode 100644
index 00000000..3493bab1
--- /dev/null
+++ b/src/content/storage.test.js
@@ -0,0 +1,12 @@
+import Storage from "./storage";
+import browser from "webextension-polyfill";
+
+test("Storage", async () => {
+  const storage = new Storage();
+  expect(storage.get()).toEqual({});
+
+  await storage.init();
+  await browser.storage.sync.set({ valid: true });
+  expect(storage.get("valid")).toBeTruthy();
+  expect(storage.get("invalid")).toBeNull();
+});
diff --git a/src/content/testUtils.js b/src/content/testUtils.js
new file mode 100644
index 00000000..e7375f38
--- /dev/null
+++ b/src/content/testUtils.js
@@ -0,0 +1,22 @@
+import "@testing-library/jest-dom/extend-expect";
+import { fireEvent, getByText } from "@testing-library/dom";
+import Storage from "./storage";
+
+window.MutationObserver = class {
+  constructor() {}
+  observe() {}
+};
+
+export async function createStorage() {
+  const storage = new Storage();
+  await storage.init();
+  return storage;
+}
+
+export function expectToFormat(textarea) {
+  fireEvent.change(textarea, {
+    target: { value: "```js\nconst variable=value\n```" },
+  });
+  fireEvent.click(getByText(document, "Prettier"));
+  expect(textarea).toHaveValue("```js\nconst variable = value;\n```\n");
+}
diff --git a/yarn.lock b/yarn.lock
index 5d511785..3ffd60e8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -953,6 +953,20 @@
   dependencies:
     regenerator-runtime "^0.13.4"
 
+"@babel/runtime@^7.5.1":
+  version "7.6.3"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.6.3.tgz#935122c74c73d2240cafd32ddb5fc2a6cd35cf1f"
+  integrity sha512-kq6anf9JGjW8Nt5rYfEuGRaEAaH1mkv3Bbu6rYvLOpPh/RusSJXuKPEAoZ7L7gybZkchE8+NV5g9vKF4AGAtsA==
+  dependencies:
+    regenerator-runtime "^0.13.2"
+
+"@babel/runtime@^7.6.2":
+  version "7.7.2"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.7.2.tgz#111a78002a5c25fc8e3361bedc9529c696b85a6a"
+  integrity sha512-JONRbXbTXc9WQE2mAZd1p0Z3DZ/6vaQIkgYMSTP3KjRCyd7rCZCcfhCyX+YjwcKxcZ82UrxbRD358bpExNgrjw==
+  dependencies:
+    regenerator-runtime "^0.13.2"
+
 "@babel/runtime@^7.6.3":
   version "7.7.7"
   resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.7.7.tgz#194769ca8d6d7790ec23605af9ee3e42a0aa79cf"
@@ -1220,6 +1234,15 @@
     source-map "^0.6.1"
     write-file-atomic "^3.0.0"
 
+"@jest/types@^24.9.0":
+  version "24.9.0"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-24.9.0.tgz#63cb26cb7500d069e5a389441a7c6ab5e909fc59"
+  integrity sha512-XKK7ze1apu5JWQ5eZjHITP66AX+QsLlbaJRBGYr8pNzwcAE2JVkwnf0yqjHTsDRcjR0mujy/NmZMXw5kl+kGBw==
+  dependencies:
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/istanbul-reports" "^1.1.1"
+    "@types/yargs" "^13.0.0"
+
 "@jest/types@^26.3.0":
   version "26.3.0"
   resolved "https://registry.yarnpkg.com/@jest/types/-/types-26.3.0.tgz#97627bf4bdb72c55346eef98e3b3f7ddc4941f71"
@@ -1259,6 +1282,11 @@
   dependencies:
     mkdirp "^1.0.4"
 
+"@sheerun/mutationobserver-shim@^0.3.2":
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/@sheerun/mutationobserver-shim/-/mutationobserver-shim-0.3.2.tgz#8013f2af54a2b7d735f71560ff360d3a8176a87b"
+  integrity sha512-vTCdPp/T/Q3oSqwHmZ5Kpa9oI7iLtGl3RQaA/NyLHikvcrPxACkkKVr/XzkSPJWXHRhKGzVvb0urJsbMlRxi1Q==
+
 "@sindresorhus/is@^0.14.0":
   version "0.14.0"
   resolved "https://registry.yarnpkg.com/@sindresorhus/is/-/is-0.14.0.tgz#9fb3a3cf3132328151f353de4632e01e52102bea"
@@ -1388,6 +1416,33 @@
   dependencies:
     defer-to-connect "^1.0.1"
 
+"@testing-library/dom@6.10.1":
+  version "6.10.1"
+  resolved "https://registry.yarnpkg.com/@testing-library/dom/-/dom-6.10.1.tgz#da5bf5065d3f9e484aef4cc495f4e1a5bea6df2e"
+  integrity sha512-5BPKxaO+zSJDUbVZBRNf9KrmDkm/EcjjaHSg3F9+031VZyPACKXlwLBjVzZxheunT9m72DoIq7WvyE457/Xweg==
+  dependencies:
+    "@babel/runtime" "^7.6.2"
+    "@sheerun/mutationobserver-shim" "^0.3.2"
+    "@types/testing-library__dom" "^6.0.0"
+    aria-query "3.0.0"
+    pretty-format "^24.9.0"
+    wait-for-expect "^3.0.0"
+
+"@testing-library/jest-dom@4.2.0":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@testing-library/jest-dom/-/jest-dom-4.2.0.tgz#32f8df3a78511b347d39374ea89dc8e0a1c2fb69"
+  integrity sha512-H61OmRhGPWLrj9emyISx0qjp8jvC9RWyRniuLAq75Ny5XfPiOvWfnY3Wm2Tf0HXusX+PG40I94Gw792IAtSKKg==
+  dependencies:
+    "@babel/runtime" "^7.5.1"
+    chalk "^2.4.1"
+    css "^2.2.3"
+    css.escape "^1.5.1"
+    jest-diff "^24.0.0"
+    jest-matcher-utils "^24.0.0"
+    lodash "^4.17.11"
+    pretty-format "^24.0.0"
+    redent "^3.0.0"
+
 "@types/anymatch@*":
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/@types/anymatch/-/anymatch-1.3.1.tgz#336badc1beecb9dacc38bea2cf32adf627a8421a"
@@ -1474,6 +1529,14 @@
   dependencies:
     "@types/istanbul-lib-coverage" "*"
 
+"@types/istanbul-reports@^1.1.1":
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/@types/istanbul-reports/-/istanbul-reports-1.1.2.tgz#e875cc689e47bce549ec81f3df5e6f6f11cfaeb2"
+  integrity sha512-P/W9yOX/3oPZSpaYOCQzGqgCQRXn0FFO/V8bWrCQs+wLmvVVxk6CRBXALEvNs9OHIatlnlFokfhuDo2ug01ciw==
+  dependencies:
+    "@types/istanbul-lib-coverage" "*"
+    "@types/istanbul-lib-report" "*"
+
 "@types/istanbul-reports@^3.0.0":
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/@types/istanbul-reports/-/istanbul-reports-3.0.0.tgz#508b13aa344fa4976234e75dddcc34925737d821"
@@ -1536,6 +1599,13 @@
   resolved "https://registry.yarnpkg.com/@types/tapable/-/tapable-1.0.5.tgz#9adbc12950582aa65ead76bffdf39fe0c27a3c02"
   integrity sha512-/gG2M/Imw7cQFp8PGvz/SwocNrmKFjFsm5Pb8HdbHkZ1K8pmuPzOX4VeVoiEecFCVf4CsN1r3/BRvx+6sNqwtQ==
 
+"@types/testing-library__dom@^6.0.0":
+  version "6.10.0"
+  resolved "https://registry.yarnpkg.com/@types/testing-library__dom/-/testing-library__dom-6.10.0.tgz#590d76e3875a7c536dc744eb530cbf51b6483404"
+  integrity sha512-mL/GMlyQxiZplbUuFNwA0vAI3k3uJNSf6slr5AVve9TXmfLfyefNT0uHHnxwdYuPMxYD5gI/+dgAvc/5opW9JQ==
+  dependencies:
+    pretty-format "^24.3.0"
+
 "@types/uglify-js@*":
   version "3.9.2"
   resolved "https://registry.yarnpkg.com/@types/uglify-js/-/uglify-js-3.9.2.tgz#01992579debba674e1e359cd6bcb1a1d0ab2e02b"
@@ -1569,6 +1639,13 @@
   resolved "https://registry.yarnpkg.com/@types/yargs-parser/-/yargs-parser-13.1.0.tgz#c563aa192f39350a1d18da36c5a8da382bbd8228"
   integrity sha512-gCubfBUZ6KxzoibJ+SCUc/57Ms1jz5NjHe4+dI2krNmU5zCPAphyLJYyTOg06ueIyfj+SaCUqmzun7ImlxDcKg==
 
+"@types/yargs@^13.0.0":
+  version "13.0.10"
+  resolved "https://registry.yarnpkg.com/@types/yargs/-/yargs-13.0.10.tgz#e77bf3fc73c781d48c2eb541f87c453e321e5f4b"
+  integrity sha512-MU10TSgzNABgdzKvQVW1nuuT+sgBMWeXNc3XOs5YXV5SDAK+PPja2eUuBNB9iqElu03xyEDqlnGw0jgl4nbqGQ==
+  dependencies:
+    "@types/yargs-parser" "*"
+
 "@types/yargs@^15.0.0":
   version "15.0.2"
   resolved "https://registry.yarnpkg.com/@types/yargs/-/yargs-15.0.2.tgz#0bf292a0369493cee030e2e4f4ff84f5982b028d"
@@ -1935,7 +2012,7 @@ ansi-regex@^3.0.0:
   resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
   integrity sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=
 
-ansi-regex@^4.1.0:
+ansi-regex@^4.0.0, ansi-regex@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-4.1.0.tgz#8b9f8f08cf1acb843756a839ca8c7e3168c51997"
   integrity sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==
@@ -2056,6 +2133,14 @@ argparse@^1.0.7:
   dependencies:
     sprintf-js "~1.0.2"
 
+aria-query@3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/aria-query/-/aria-query-3.0.0.tgz#65b3fcc1ca1155a8c9ae64d6eee297f15d5133cc"
+  integrity sha1-ZbP8wcoRVajJrmTW7uKX8V1RM8w=
+  dependencies:
+    ast-types-flow "0.0.7"
+    commander "^2.11.0"
+
 arr-diff@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/arr-diff/-/arr-diff-4.0.0.tgz#d6461074febfec71e7e15235761a329a5dc7c520"
@@ -2170,6 +2255,11 @@ assign-symbols@^1.0.0:
   resolved "https://registry.yarnpkg.com/assign-symbols/-/assign-symbols-1.0.0.tgz#59667f41fadd4f20ccbc2bb96b8d4f7f78ec0367"
   integrity sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=
 
+ast-types-flow@0.0.7:
+  version "0.0.7"
+  resolved "https://registry.yarnpkg.com/ast-types-flow/-/ast-types-flow-0.0.7.tgz#f70b735c6bca1a5c9c22d982c3e39e7feba3bdad"
+  integrity sha1-9wtzXGvKGlycItmCw+Oef+ujva0=
+
 astral-regex@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-1.0.0.tgz#6c8c3fb827dd43ee3918f27b82782ab7658a6fd9"
@@ -3077,7 +3167,7 @@ commander@2.9.0:
   dependencies:
     graceful-readlink ">= 1.0.0"
 
-commander@^2.20.0, commander@^2.3.0, commander@^2.6.0:
+commander@^2.11.0, commander@^2.20.0, commander@^2.3.0, commander@^2.6.0:
   version "2.20.3"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
   integrity sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==
@@ -3466,6 +3556,21 @@ css-what@^3.2.1:
   resolved "https://registry.yarnpkg.com/css-what/-/css-what-3.3.0.tgz#10fec696a9ece2e591ac772d759aacabac38cd39"
   integrity sha512-pv9JPyatiPaQ6pf4OvD/dbfm0o5LviWmwxNWzblYf/1u9QZd0ihV+PMwy5jdQWQ3349kZmKEx9WXuSka2dM4cg==
 
+css.escape@^1.5.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/css.escape/-/css.escape-1.5.1.tgz#42e27d4fa04ae32f931a4b4d4191fa9cddee97cb"
+  integrity sha1-QuJ9T6BK4y+TGktNQZH6nN3ul8s=
+
+css@^2.2.3:
+  version "2.2.4"
+  resolved "https://registry.yarnpkg.com/css/-/css-2.2.4.tgz#c646755c73971f2bba6a601e2cf2fd71b1298929"
+  integrity sha512-oUnjmWpy0niI3x/mPL8dVEI1l7MnG3+HHyRPHf+YFSbK+svOhXpmSOcDURUh2aOCgl2grzrOPt1nHLuCVFULLw==
+  dependencies:
+    inherits "^2.0.3"
+    source-map "^0.6.1"
+    source-map-resolve "^0.5.2"
+    urix "^0.1.0"
+
 cssesc@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-3.0.0.tgz#37741919903b868565e1c09ea747445cd18983ee"
@@ -3700,6 +3805,11 @@ detect-node@^2.0.4:
   resolved "https://registry.yarnpkg.com/detect-node/-/detect-node-2.0.4.tgz#014ee8f8f669c5c58023da64b8179c083a28c46c"
   integrity sha512-ZIzRpLJrOj7jjP2miAtgqIfmzbxa4ZOr5jJc601zklsfEx9oTzmmj2nVpIPRpNlRTIh8lc1kyViIY7BWSGNmKw==
 
+diff-sequences@^24.9.0:
+  version "24.9.0"
+  resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-24.9.0.tgz#5715d6244e2aa65f48bba0bc972db0b0b11e95b5"
+  integrity sha512-Dj6Wk3tWyTE+Fo1rW8v0Xhwk80um6yFYKbuAxc9c3EZxIHFDYwbi34Uk42u1CdnIiVorvt4RmlSDjIPyzGC2ew==
+
 diff-sequences@^26.3.0:
   version "26.3.0"
   resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-26.3.0.tgz#62a59b1b29ab7fd27cef2a33ae52abe73042d0a2"
@@ -4093,6 +4203,13 @@ eslint-config-prettier@6.11.0:
   dependencies:
     get-stdin "^6.0.0"
 
+eslint-plugin-jest-dom@1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-jest-dom/-/eslint-plugin-jest-dom-1.3.0.tgz#8cff5077af4647d29fa04838b4ef4f7d805b782d"
+  integrity sha512-e1V5Z4xDz0z62Yy4A3nlMU3HzGlHCWiCekXMpe6zfEmElmeEpPYRa35Ehzn9Mn9IGKa6T11SXyRH1KMnFMcZlg==
+  dependencies:
+    requireindex "~1.2.0"
+
 eslint-plugin-no-unsanitized@3.1.2:
   version "3.1.2"
   resolved "https://registry.yarnpkg.com/eslint-plugin-no-unsanitized/-/eslint-plugin-no-unsanitized-3.1.2.tgz#a54724e0b81d43279bb1f8f5e1d82c97da78c858"
@@ -4127,6 +4244,11 @@ eslint-plugin-react@7.20.6:
     resolve "^1.17.0"
     string.prototype.matchall "^4.0.2"
 
+eslint-plugin-testing-library@1.3.2:
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-testing-library/-/eslint-plugin-testing-library-1.3.2.tgz#1aab27c166c6c6e1a98e578fb38f7e143a850b99"
+  integrity sha512-ZrJGex7YbaymUvSxgMJp1MmqqJo0OvElcd3XImtIHBbzPPnBhvExl+s+//yYlP8QO+jZCvyHGx/4rGGsKU2UTw==
+
 eslint-scope@^4.0.3:
   version "4.0.3"
   resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-4.0.3.tgz#ca03833310f6889a3264781aa82e63eb9cfe7848"
@@ -5968,6 +6090,16 @@ jest-config@^26.4.2:
     micromatch "^4.0.2"
     pretty-format "^26.4.2"
 
+jest-diff@^24.0.0, jest-diff@^24.9.0:
+  version "24.9.0"
+  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-24.9.0.tgz#931b7d0d5778a1baf7452cb816e325e3724055da"
+  integrity sha512-qMfrTs8AdJE2iqrTp0hzh7kTd2PQWrsFyj9tORoKmu32xjPjeE4NyjVRDz8ybYwqS2ik8N4hsIpiVTyFeo2lBQ==
+  dependencies:
+    chalk "^2.0.1"
+    diff-sequences "^24.9.0"
+    jest-get-type "^24.9.0"
+    pretty-format "^24.9.0"
+
 jest-diff@^26.4.2:
   version "26.4.2"
   resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-26.4.2.tgz#a1b7b303bcc534aabdb3bd4a7caf594ac059f5aa"
@@ -6021,6 +6153,11 @@ jest-environment-node@^26.3.0:
     jest-mock "^26.3.0"
     jest-util "^26.3.0"
 
+jest-get-type@^24.9.0:
+  version "24.9.0"
+  resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-24.9.0.tgz#1684a0c8a50f2e4901b6644ae861f579eed2ef0e"
+  integrity sha512-lUseMzAley4LhIcpSP9Jf+fTrQ4a1yHQwLNeeVa2cEmbCGeoZAtYPOIv8JaxLD/sUpKxetKGP+gsHl8f8TSj8Q==
+
 jest-get-type@^26.3.0:
   version "26.3.0"
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-26.3.0.tgz#e97dc3c3f53c2b406ca7afaed4493b1d099199e0"
@@ -6079,6 +6216,16 @@ jest-leak-detector@^26.4.2:
     jest-get-type "^26.3.0"
     pretty-format "^26.4.2"
 
+jest-matcher-utils@^24.0.0:
+  version "24.9.0"
+  resolved "https://registry.yarnpkg.com/jest-matcher-utils/-/jest-matcher-utils-24.9.0.tgz#f5b3661d5e628dffe6dd65251dfdae0e87c3a073"
+  integrity sha512-OZz2IXsu6eaiMAwe67c1T+5tUAtQyQx27/EMEkbFAGiw52tB9em+uGbzpcgYVpA8wl0hlxKPZxrly4CXU/GjHA==
+  dependencies:
+    chalk "^2.0.1"
+    jest-diff "^24.9.0"
+    jest-get-type "^24.9.0"
+    pretty-format "^24.9.0"
+
 jest-matcher-utils@^26.4.2:
   version "26.4.2"
   resolved "https://registry.yarnpkg.com/jest-matcher-utils/-/jest-matcher-utils-26.4.2.tgz#fa81f3693f7cb67e5fc1537317525ef3b85f4b06"
@@ -6767,6 +6914,11 @@ lodash@^4.17.10, lodash@^4.17.13, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.19.tgz#e48ddedbe30b3321783c5b4301fbd353bc1e4a4b"
   integrity sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ==
 
+lodash@^4.17.11:
+  version "4.17.15"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
+  integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
+
 log-symbols@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/log-symbols/-/log-symbols-4.0.0.tgz#69b3cc46d20f448eccdb75ea1fa733d9e821c920"
@@ -7033,6 +7185,11 @@ mimic-response@^1.0.0, mimic-response@^1.0.1:
   resolved "https://registry.yarnpkg.com/mimic-response/-/mimic-response-1.0.1.tgz#4923538878eef42063cb8a3e3b0798781487ab1b"
   integrity sha512-j5EctnkH7amfV/q5Hgmoal1g2QHFJRraOtmx0JpIqkxhBhI/lJSl1nMpQ45hVarwNETOoWEimndZ4QK0RHxuxQ==
 
+min-indent@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/min-indent/-/min-indent-1.0.0.tgz#cfc45c37e9ec0d8f0a0ec3dd4ef7f7c3abe39256"
+  integrity sha1-z8RcN+nsDY8KDsPdTvf3w6vjklY=
+
 minimalistic-assert@^1.0.0, minimalistic-assert@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz#2e194de044626d4a10e7f7fbc00ce73e83e4d5c7"
@@ -8147,6 +8304,16 @@ pretty-error@^2.1.1:
     renderkid "^2.0.1"
     utila "~0.4"
 
+pretty-format@^24.0.0, pretty-format@^24.3.0, pretty-format@^24.9.0:
+  version "24.9.0"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-24.9.0.tgz#12fac31b37019a4eea3c11aa9a959eb7628aa7c9"
+  integrity sha512-00ZMZUiHaJrNfk33guavqgvfJS30sLYf0f8+Srklv0AMPodGGHcoHgksZ3OThYnIvOd+8yMCn0YiEOogjlgsnA==
+  dependencies:
+    "@jest/types" "^24.9.0"
+    ansi-regex "^4.0.0"
+    ansi-styles "^3.2.0"
+    react-is "^16.8.4"
+
 pretty-format@^26.4.2:
   version "26.4.2"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.4.2.tgz#d081d032b398e801e2012af2df1214ef75a81237"
@@ -8379,6 +8546,11 @@ react-is@^16.12.0, react-is@^16.8.1:
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.12.0.tgz#2cc0fe0fba742d97fd527c42a13bec4eeb06241c"
   integrity sha512-rPCkf/mWBtKc97aLL9/txD8DZdemK0vkA3JMLShjlJB3Pj3s+lpf1KaBzMfQrAmhMQB0n1cU/SUGgKKBCe837Q==
 
+react-is@^16.8.4:
+  version "16.13.1"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.13.1.tgz#789729a4dc36de2999dc156dd6c1d9c18cea56a4"
+  integrity sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==
+
 react@16.13.1:
   version "16.13.1"
   resolved "https://registry.yarnpkg.com/react/-/react-16.13.1.tgz#2e818822f1a9743122c063d6410d85c1e3afe48e"
@@ -8452,6 +8624,14 @@ readdirp@~3.4.0:
   dependencies:
     picomatch "^2.2.1"
 
+redent@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/redent/-/redent-3.0.0.tgz#e557b7998316bb53c9f1f56fa626352c6963059f"
+  integrity sha512-6tDA8g98We0zd0GvVeMT9arEOnTw9qM03L9cJXaCjrip1OO764RDBLBfrB4cwzNGDj5OA5ioymC9GkizgWJDUg==
+  dependencies:
+    indent-string "^4.0.0"
+    strip-indent "^3.0.0"
+
 regenerate-unicode-properties@^8.2.0:
   version "8.2.0"
   resolved "https://registry.yarnpkg.com/regenerate-unicode-properties/-/regenerate-unicode-properties-8.2.0.tgz#e5de7111d655e7ba60c057dbe9ff37c87e65cdec"
@@ -8647,6 +8827,11 @@ require-main-filename@^2.0.0:
   resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-2.0.0.tgz#d0b329ecc7cc0f61649f62215be69af54aa8989b"
   integrity sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==
 
+requireindex@~1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/requireindex/-/requireindex-1.2.0.tgz#3463cdb22ee151902635aa6c9535d4de9c2ef1ef"
+  integrity sha512-L9jEkOi3ASd9PYit2cwRfyppc9NoABujTP8/5gFcbERmo5jUoAKovIC3fsF17pkTnGsrByysqX+Kxd2OTNI1ww==
+
 resolve-cwd@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/resolve-cwd/-/resolve-cwd-2.0.0.tgz#00a9f7387556e27038eae232caa372a6a59b665a"
@@ -9159,7 +9344,7 @@ source-list-map@^2.0.0:
   resolved "https://registry.yarnpkg.com/source-list-map/-/source-list-map-2.0.1.tgz#3993bd873bfc48479cca9ea3a547835c7c154b34"
   integrity sha512-qnQ7gVMxGNxsiL4lEuJwe/To8UnK7fAnmbGEEH8RpLouuKbeEm0lhbQVFIrNSuB+G7tVrAlVsZgETT5nljf+Iw==
 
-source-map-resolve@^0.5.0:
+source-map-resolve@^0.5.0, source-map-resolve@^0.5.2:
   version "0.5.2"
   resolved "https://registry.yarnpkg.com/source-map-resolve/-/source-map-resolve-0.5.2.tgz#72e2cc34095543e43b2c62b2c4c10d4a9054f259"
   integrity sha512-MjqsvNwyz1s0k81Goz/9vRBe9SZdB09Bdw+/zYyO+3CuPk6fouTaxscHkgtE8jKvf01kVfl8riHzERQ/kefaSA==
@@ -9546,6 +9731,13 @@ strip-final-newline@^2.0.0:
   resolved "https://registry.yarnpkg.com/strip-final-newline/-/strip-final-newline-2.0.0.tgz#89b852fb2fcbe936f6f4b3187afb0a12c1ab58ad"
   integrity sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==
 
+strip-indent@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/strip-indent/-/strip-indent-3.0.0.tgz#c32e1cee940b6b3432c771bc2c54bcce73cd3001"
+  integrity sha512-laJTa3Jb+VQpaC6DseHhF7dXVqHTfJPCRDaEbid/drOhgitgYku/letMUqOXFoWV0zIIUbjpdH2t+tYj4bQMRQ==
+  dependencies:
+    min-indent "^1.0.0"
+
 strip-json-comments@3.1.1:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-3.1.1.tgz#31f1281b3832630434831c310c01cccda8cbe006"
@@ -10287,6 +10479,11 @@ w3c-xmlserializer@^2.0.0:
   dependencies:
     xml-name-validator "^3.0.0"
 
+wait-for-expect@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/wait-for-expect/-/wait-for-expect-3.0.1.tgz#ec204a76b0038f17711e575720aaf28505ac7185"
+  integrity sha512-3Ha7lu+zshEG/CeHdcpmQsZnnZpPj/UsG3DuKO8FskjuDbkx3jE3845H+CuwZjA2YWYDfKMU2KhnCaXMLd3wVw==
+
 walker@^1.0.7, walker@~1.0.5:
   version "1.0.7"
   resolved "https://registry.yarnpkg.com/walker/-/walker-1.0.7.tgz#2f7f9b8fd10d677262b18a884e28d19618e028fb"