devtools: config and scripts for frontend testing

Adds dependencies, configuration, and scripts for frontend
e2e and unit testing. Test examples to follow this change.

Change-Id: Ia3d246abfcc1411d5b00ca7e23829f1ede6e7207
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/280600
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
Trust: Jamal Carvalho <jamal@golang.org>
diff --git a/devtools/config/Dockerfile.npm b/devtools/config/Dockerfile.npm
index b796403..02c0922 100644
--- a/devtools/config/Dockerfile.npm
+++ b/devtools/config/Dockerfile.npm
@@ -4,6 +4,26 @@
 
 FROM node:14.15.1
 
+# Install latest chrome dev package and fonts to support major charsets (Chinese, Japanese, Arabic,
+# Hebrew, Thai and a few others)
+# Note: this installs the necessary libs to make the bundled version of Chromium that Puppeteer
+# installs, work.
+RUN apt-get update \
+  && apt-get install -y wget gnupg \
+  && wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - \
+  && sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' \
+  && apt-get update \
+  && apt-get install -y \
+  google-chrome-stable \
+  fonts-ipafont-gothic \
+  fonts-wqy-zenhei \
+  fonts-thai-tlwg \
+  fonts-kacst \
+  fonts-freefont-ttf \
+  libxss1 \
+  --no-install-recommends \
+  && rm -rf /var/lib/apt/lists/*
+
 WORKDIR /pkgsite
 
 ENTRYPOINT [ "npm" ]
diff --git a/devtools/config/docker-compose.yaml b/devtools/config/docker-compose.yaml
index ce7ac5d..90a24b5 100644
--- a/devtools/config/docker-compose.yaml
+++ b/devtools/config/docker-compose.yaml
@@ -8,11 +8,13 @@
     build:
       context: ../../
       dockerfile: devtools/config/Dockerfile.npm
+    environment:
+      FRONTEND_URL: http://host.docker.internal:8080
     image: pkgsite_npm
     init: true
     volumes:
       - ../..:/pkgsite
       # Mounts empty volumes in place of git directories so they can't
-      # be written to during npm package installs. 
+      # be written to during npm package installs.
       - /pkgsite/.git
       - /pkgsite/private/.git
diff --git a/devtools/config/jest.config.js b/devtools/config/jest.config.js
new file mode 100644
index 0000000..1622999
--- /dev/null
+++ b/devtools/config/jest.config.js
@@ -0,0 +1,6 @@
+// eslint-disable-next-line no-undef
+module.exports = {
+  preset: 'ts-jest',
+  rootDir: '../../',
+  testEnvironment: 'node',
+};
diff --git a/package-lock.json b/package-lock.json
index 6301de6..d414a9b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -108,6 +108,11 @@
         "@babel/types": "^7.12.10"
       }
     },
+    "@babel/helper-plugin-utils": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.10.4.tgz",
+      "integrity": "sha512-O4KCvQA6lLiMU9l2eawBPMf1xPP8xPfB3iEQw150hOVTqj/rfXz0ThTb4HEzqQfs2Bmo5Ay8BzxfzVtBrr9dVg=="
+    },
     "@babel/helper-replace-supers": {
       "version": "7.12.11",
       "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.12.11.tgz",
@@ -177,6 +182,102 @@
       "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.12.11.tgz",
       "integrity": "sha512-N3UxG+uuF4CMYoNj8AhnbAcJF0PiuJ9KHuy1lQmkYsxTer/MAH9UBNHsBoAX/4s6NvlDD047No8mYVGGzLL4hg=="
     },
+    "@babel/plugin-syntax-async-generators": {
+      "version": "7.8.4",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-async-generators/-/plugin-syntax-async-generators-7.8.4.tgz",
+      "integrity": "sha512-tycmZxkGfZaxhMRbXlPXuVFpdWlXpir2W4AMhSJgRKzk/eDlIXOhb2LHWoLpDF7TEHylV5zNhykX6KAgHJmTNw==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.8.0"
+      }
+    },
+    "@babel/plugin-syntax-bigint": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-bigint/-/plugin-syntax-bigint-7.8.3.tgz",
+      "integrity": "sha512-wnTnFlG+YxQm3vDxpGE57Pj0srRU4sHE/mDkt1qv2YJJSeUAec2ma4WLUnUPeKjyrfntVwe/N6dCXpU+zL3Npg==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.8.0"
+      }
+    },
+    "@babel/plugin-syntax-class-properties": {
+      "version": "7.12.1",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-class-properties/-/plugin-syntax-class-properties-7.12.1.tgz",
+      "integrity": "sha512-U40A76x5gTwmESz+qiqssqmeEsKvcSyvtgktrm0uzcARAmM9I1jR221f6Oq+GmHrcD+LvZDag1UTOTe2fL3TeA==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.10.4"
+      }
+    },
+    "@babel/plugin-syntax-import-meta": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-import-meta/-/plugin-syntax-import-meta-7.10.4.tgz",
+      "integrity": "sha512-Yqfm+XDx0+Prh3VSeEQCPU81yC+JWZ2pDPFSS4ZdpfZhp4MkFMaDC1UqseovEKwSUpnIL7+vK+Clp7bfh0iD7g==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.10.4"
+      }
+    },
+    "@babel/plugin-syntax-json-strings": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-json-strings/-/plugin-syntax-json-strings-7.8.3.tgz",
+      "integrity": "sha512-lY6kdGpWHvjoe2vk4WrAapEuBR69EMxZl+RoGRhrFGNYVK8mOPAW8VfbT/ZgrFbXlDNiiaxQnAtgVCZ6jv30EA==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.8.0"
+      }
+    },
+    "@babel/plugin-syntax-logical-assignment-operators": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-logical-assignment-operators/-/plugin-syntax-logical-assignment-operators-7.10.4.tgz",
+      "integrity": "sha512-d8waShlpFDinQ5MtvGU9xDAOzKH47+FFoney2baFIoMr952hKOLp1HR7VszoZvOsV/4+RRszNY7D17ba0te0ig==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.10.4"
+      }
+    },
+    "@babel/plugin-syntax-nullish-coalescing-operator": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-nullish-coalescing-operator/-/plugin-syntax-nullish-coalescing-operator-7.8.3.tgz",
+      "integrity": "sha512-aSff4zPII1u2QD7y+F8oDsz19ew4IGEJg9SVW+bqwpwtfFleiQDMdzA/R+UlWDzfnHFCxxleFT0PMIrR36XLNQ==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.8.0"
+      }
+    },
+    "@babel/plugin-syntax-numeric-separator": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-numeric-separator/-/plugin-syntax-numeric-separator-7.10.4.tgz",
+      "integrity": "sha512-9H6YdfkcK/uOnY/K7/aA2xpzaAgkQn37yzWUMRK7OaPOqOpGS1+n0H5hxT9AUw9EsSjPW8SVyMJwYRtWs3X3ug==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.10.4"
+      }
+    },
+    "@babel/plugin-syntax-object-rest-spread": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-object-rest-spread/-/plugin-syntax-object-rest-spread-7.8.3.tgz",
+      "integrity": "sha512-XoqMijGZb9y3y2XskN+P1wUGiVwWZ5JmoDRwx5+3GmEplNyVM2s2Dg8ILFQm8rWM48orGy5YpI5Bl8U1y7ydlA==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.8.0"
+      }
+    },
+    "@babel/plugin-syntax-optional-catch-binding": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-optional-catch-binding/-/plugin-syntax-optional-catch-binding-7.8.3.tgz",
+      "integrity": "sha512-6VPD0Pc1lpTqw0aKoeRTMiB+kWhAoT24PA+ksWSBrFtl5SIRVpZlwN3NNPQjehA2E/91FV3RjLWoVTglWcSV3Q==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.8.0"
+      }
+    },
+    "@babel/plugin-syntax-optional-chaining": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-optional-chaining/-/plugin-syntax-optional-chaining-7.8.3.tgz",
+      "integrity": "sha512-KoK9ErH1MBlCPxV0VANkXW2/dw4vlbGDrFgz8bmUsBGYkFRcbRwMh6cIJubdPrkxRwuGdtCk0v/wPTKbQgBjkg==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.8.0"
+      }
+    },
+    "@babel/plugin-syntax-top-level-await": {
+      "version": "7.12.1",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-top-level-await/-/plugin-syntax-top-level-await-7.12.1.tgz",
+      "integrity": "sha512-i7ooMZFS+a/Om0crxZodrTzNEPJHZrlMVGMTEpFAj6rYY/bKCddB0Dk/YxfPuYXOopuhKk/e1jV6h+WUU9XN3A==",
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.10.4"
+      }
+    },
     "@babel/template": {
       "version": "7.12.7",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.12.7.tgz",
@@ -220,6 +321,20 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@bcoe/v8-coverage": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-0.2.3.tgz",
+      "integrity": "sha512-0hYQ8SB4Db5zvZB4axdMHGwEaQjkZzFjQiN9LVYvIFB2nSUHW9tYpxWriPrWDASIxiaXax83REcLxuSdnGPZtw=="
+    },
+    "@cnakazawa/watch": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@cnakazawa/watch/-/watch-1.0.4.tgz",
+      "integrity": "sha512-v9kIhKwjeZThiWrLmj0y17CWoyddASLj9O2yvbZkbvw/N3rWOYy9zkV66ursAoVr0mV15bL8g0c4QZUE6cdDoQ==",
+      "requires": {
+        "exec-sh": "^0.3.2",
+        "minimist": "^1.2.0"
+      }
+    },
     "@eslint/eslintrc": {
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.2.2.tgz",
@@ -244,6 +359,242 @@
         }
       }
     },
+    "@istanbuljs/load-nyc-config": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
+      "integrity": "sha512-VjeHSlIzpv/NyD3N0YuHfXOPDIixcA1q2ZV98wsMqcYlPmv2n3Yb2lYP9XMElnaFVXg5A7YLTeLu6V84uQDjmQ==",
+      "requires": {
+        "camelcase": "^5.3.1",
+        "find-up": "^4.1.0",
+        "get-package-type": "^0.1.0",
+        "js-yaml": "^3.13.1",
+        "resolve-from": "^5.0.0"
+      },
+      "dependencies": {
+        "resolve-from": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-5.0.0.tgz",
+          "integrity": "sha512-qYg9KP24dD5qka9J47d0aVky0N+b4fTU89LN9iDnjB5waksiC49rvMB0PrUJQGoTmH50XPiqOvAjDfaijGxYZw=="
+        }
+      }
+    },
+    "@istanbuljs/schema": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.2.tgz",
+      "integrity": "sha512-tsAQNx32a8CoFhjhijUIhI4kccIAgmGhy8LZMZgGfmXcpMbPRUqn5LWmgRttILi6yeGmBJd2xsPkFMs0PzgPCw=="
+    },
+    "@jest/console": {
+      "version": "26.6.2",
+      "resolved": "https://registry.npmjs.org/@jest/console/-/console-26.6.2.tgz",
+      "integrity": "sha512-IY1R2i2aLsLr7Id3S6p2BA82GNWryt4oSvEXLAKc+L2zdi89dSkE8xC1C+0kpATG4JhBJREnQOH7/zmccM2B0g==",
+      "requires": {
+        "@jest/types": "^26.6.2",
+        "@types/node": "*",
+        "chalk": "^4.0.0",
+        "jest-message-util": "^26.6.2",
+        "jest-util": "^26.6.2",
+        "slash": "^3.0.0"
+      }
+    },
+    "@jest/core": {
+      "version": "26.6.3",
+      "resolved": "https://registry.npmjs.org/@jest/core/-/core-26.6.3.tgz",
+      "integrity": "sha512-xvV1kKbhfUqFVuZ8Cyo+JPpipAHHAV3kcDBftiduK8EICXmTFddryy3P7NfZt8Pv37rA9nEJBKCCkglCPt/Xjw==",
+      "requires": {
+        "@jest/console": "^26.6.2",
+        "@jest/reporters": "^26.6.2",
+        "@jest/test-result": "^26.6.2",
+        "@jest/transform": "^26.6.2",
+        "@jest/types": "^26.6.2",
+        "@types/node": "*",
+        "ansi-escapes": "^4.2.1",
+        "chalk": "^4.0.0",
+        "exit": "^0.1.2",
+        "graceful-fs": "^4.2.4",
+        "jest-changed-files": "^26.6.2",
+        "jest-config": "^26.6.3",
+        "jest-haste-map": "^26.6.2",
+        "jest-message-util": "^26.6.2",
+        "jest-regex-util": "^26.0.0",
+        "jest-resolve": "^26.6.2",
+        "jest-resolve-dependencies": "^26.6.3",
+        "jest-runner": "^26.6.3",
+        "jest-runtime": "^26.6.3",
+        "jest-snapshot": "^26.6.2",
+        "jest-util": "^26.6.2",
+        "jest-validate": "^26.6.2",
+        "jest-watcher": "^26.6.2",
+        "micromatch": "^4.0.2",
+        "p-each-series": "^2.1.0",
+        "rimraf": "^3.0.0",
+        "slash": "^3.0.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "dependencies": {
+        "rimraf": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
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+          "requires": {
+            "glob": "^7.1.3"
+          }
+        }
+      }
+    },
+    "@jest/environment": {
+      "version": "26.6.2",
+      "resolved": "https://registry.npmjs.org/@jest/environment/-/environment-26.6.2.tgz",
+      "integrity": "sha512-nFy+fHl28zUrRsCeMB61VDThV1pVTtlEokBRgqPrcT1JNq4yRNIyTHfyht6PqtUvY9IsuLGTrbG8kPXjSZIZwA==",
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+        "@jest/fake-timers": "^26.6.2",
+        "@jest/types": "^26.6.2",
+        "@types/node": "*",
+        "jest-mock": "^26.6.2"
+      }
+    },
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+      "version": "26.6.2",
+      "resolved": "https://registry.npmjs.org/@jest/fake-timers/-/fake-timers-26.6.2.tgz",
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+        "@jest/types": "^26.6.2",
+        "@sinonjs/fake-timers": "^6.0.1",
+        "@types/node": "*",
+        "jest-message-util": "^26.6.2",
+        "jest-mock": "^26.6.2",
+        "jest-util": "^26.6.2"
+      }
+    },
+    "@jest/globals": {
+      "version": "26.6.2",
+      "resolved": "https://registry.npmjs.org/@jest/globals/-/globals-26.6.2.tgz",
+      "integrity": "sha512-85Ltnm7HlB/KesBUuALwQ68YTU72w9H2xW9FjZ1eL1U3lhtefjjl5c2MiUbpXt/i6LaPRvoOFJ22yCBSfQ0JIA==",
+      "requires": {
+        "@jest/environment": "^26.6.2",
+        "@jest/types": "^26.6.2",
+        "expect": "^26.6.2"
+      }
+    },
+    "@jest/reporters": {
+      "version": "26.6.2",
+      "resolved": "https://registry.npmjs.org/@jest/reporters/-/reporters-26.6.2.tgz",
+      "integrity": "sha512-h2bW53APG4HvkOnVMo8q3QXa6pcaNt1HkwVsOPMBV6LD/q9oSpxNSYZQYkAnjdMjrJ86UuYeLo+aEZClV6opnw==",
+      "requires": {
+        "@bcoe/v8-coverage": "^0.2.3",
+        "@jest/console": "^26.6.2",
+        "@jest/test-result": "^26.6.2",
+        "@jest/transform": "^26.6.2",
+        "@jest/types": "^26.6.2",
+        "chalk": "^4.0.0",
+        "collect-v8-coverage": "^1.0.0",
+        "exit": "^0.1.2",
+        "glob": "^7.1.2",
+        "graceful-fs": "^4.2.4",
+        "istanbul-lib-coverage": "^3.0.0",
+        "istanbul-lib-instrument": "^4.0.3",
+        "istanbul-lib-report": "^3.0.0",
+        "istanbul-lib-source-maps": "^4.0.0",
+        "istanbul-reports": "^3.0.2",
+        "jest-haste-map": "^26.6.2",
+        "jest-resolve": "^26.6.2",
+        "jest-util": "^26.6.2",
+        "jest-worker": "^26.6.2",
+        "node-notifier": "^8.0.0",
+        "slash": "^3.0.0",
+        "source-map": "^0.6.0",
+        "string-length": "^4.0.1",
+        "terminal-link": "^2.0.0",
+        "v8-to-istanbul": "^7.0.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
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+        }
+      }
+    },
+    "@jest/source-map": {
+      "version": "26.6.2",
+      "resolved": "https://registry.npmjs.org/@jest/source-map/-/source-map-26.6.2.tgz",
+      "integrity": "sha512-YwYcCwAnNmOVsZ8mr3GfnzdXDAl4LaenZP5z+G0c8bzC9/dugL8zRmxZzdoTl4IaS3CryS1uWnROLPFmb6lVvA==",
+      "requires": {
+        "callsites": "^3.0.0",
+        "graceful-fs": "^4.2.4",
+        "source-map": "^0.6.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
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+        }
+      }
+    },
+    "@jest/test-result": {
+      "version": "26.6.2",
+      "resolved": "https://registry.npmjs.org/@jest/test-result/-/test-result-26.6.2.tgz",
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+      "requires": {
+        "@jest/console": "^26.6.2",
+        "@jest/types": "^26.6.2",
+        "@types/istanbul-lib-coverage": "^2.0.0",
+        "collect-v8-coverage": "^1.0.0"
+      }
+    },
+    "@jest/test-sequencer": {
+      "version": "26.6.3",
+      "resolved": "https://registry.npmjs.org/@jest/test-sequencer/-/test-sequencer-26.6.3.tgz",
+      "integrity": "sha512-YHlVIjP5nfEyjlrSr8t/YdNfU/1XEt7c5b4OxcXCjyRhjzLYu/rO69/WHPuYcbCWkz8kAeZVZp2N2+IOLLEPGw==",
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+        "@jest/test-result": "^26.6.2",
+        "graceful-fs": "^4.2.4",
+        "jest-haste-map": "^26.6.2",
+        "jest-runner": "^26.6.3",
+        "jest-runtime": "^26.6.3"
+      }
+    },
+    "@jest/transform": {
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       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -3172,6 +7050,16 @@
         "builtins": "^1.0.3"
       }
     },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
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     "vfile": {
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       "resolved": "https://registry.npmjs.org/vfile/-/vfile-4.2.1.tgz",
@@ -3192,6 +7080,58 @@
         "unist-util-stringify-position": "^2.0.0"
       }
     },
+    "w3c-hr-time": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.2.tgz",
+      "integrity": "sha512-z8P5DvDNjKDoFIHK7q8r8lackT6l+jo/Ye3HOle7l9nICP9lf1Ci25fy9vHd0JOWewkIFzXIEig3TdKT7JQ5fQ==",
+      "requires": {
+        "browser-process-hrtime": "^1.0.0"
+      }
+    },
+    "w3c-xmlserializer": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-2.0.0.tgz",
+      "integrity": "sha512-4tzD0mF8iSiMiNs30BiLO3EpfGLZUT2MSX/G+o7ZywDzliWQ3OPtTZ0PTC3B3ca1UAf4cJMHB+2Bf56EriJuRA==",
+      "requires": {
+        "xml-name-validator": "^3.0.0"
+      }
+    },
+    "walker": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
+      "integrity": "sha1-L3+bj9ENZ3JisYqITijRlhjgKPs=",
+      "requires": {
+        "makeerror": "1.0.x"
+      }
+    },
+    "webidl-conversions": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-6.1.0.tgz",
+      "integrity": "sha512-qBIvFLGiBpLjfwmYAaHPXsn+ho5xZnGvyGvsarywGNc8VyQJUMHJ8OBKGGrPER0okBeMDaan4mNBlgBROxuI8w=="
+    },
+    "whatwg-encoding": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "requires": {
+        "iconv-lite": "0.4.24"
+      }
+    },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g=="
+    },
+    "whatwg-url": {
+      "version": "8.4.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-8.4.0.tgz",
+      "integrity": "sha512-vwTUFf6V4zhcPkWp/4CQPr1TW9Ml6SF4lVyaIMBdJw5i6qUUJ1QWM4Z6YYVkfka0OUIzVo/0aNtGVGk256IKWw==",
+      "requires": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^2.0.2",
+        "webidl-conversions": "^6.1.0"
+      }
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -3200,11 +7140,69 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
+    },
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ=="
     },
+    "wrap-ansi": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
+      "integrity": "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==",
+      "requires": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "4.3.0",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+          "requires": {
+            "color-convert": "^2.0.1"
+          }
+        },
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
+        },
+        "emoji-regex": {
+          "version": "8.0.0",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+          "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A=="
+        },
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
+        },
+        "string-width": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+          "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        }
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -3229,6 +7227,26 @@
         "typedarray-to-buffer": "^3.1.5"
       }
     },
+    "ws": {
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.1.tgz",
+      "integrity": "sha512-pTsP8UAfhy3sk1lSk/O/s4tjD0CRwvMnzvwr4OKGX7ZvqZtUyx4KIJB5JWbkykPoc55tixMGgTNoh3k4FkNGFQ=="
+    },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw=="
+    },
+    "xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw=="
+    },
+    "y18n": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
+      "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ=="
+    },
     "yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
@@ -3239,11 +7257,69 @@
       "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.0.tgz",
       "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg=="
     },
+    "yargs": {
+      "version": "15.4.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
+      "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
+      "requires": {
+        "cliui": "^6.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^4.1.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^4.2.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^18.1.2"
+      },
+      "dependencies": {
+        "emoji-regex": {
+          "version": "8.0.0",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+          "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A=="
+        },
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
+        },
+        "string-width": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+          "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        },
+        "yargs-parser": {
+          "version": "18.1.3",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.3.tgz",
+          "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
+      }
+    },
     "yargs-parser": {
       "version": "20.2.4",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
       "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA=="
     },
+    "yauzl": {
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
+      "requires": {
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
+      }
+    },
     "zwitch": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/zwitch/-/zwitch-1.0.5.tgz",
diff --git a/package.json b/package.json
index ab62f1f..04dfb26 100644
--- a/package.json
+++ b/package.json
@@ -7,24 +7,35 @@
   "private": true,
   "scripts": {
     "lint": "run-s --continue-on-error \"lint-* -- {1}\" -- ",
-    "lint-js": "eslint . --ext .ts,.js",
+    "lint-js": "eslint . --ext .ts",
     "lint-css": "stylelint **/*.css",
-    "license-check": "jsgl --local ."
+    "license-check": "jsgl --local .",
+    "test-typecheck": "tsc --noEmit",
+    "test-unit": "jest --config devtools/config/jest.config.js content",
+    "test-e2e": "jest --config devtools/config/jest.config.js e2e",
+    "test": "run-s test-*"
   },
   "dependencies": {
+    "@types/jest": "26.0.16",
+    "@types/jest-image-snapshot": "4.1.3",
+    "@types/puppeteer": "5.4.0",
     "@typescript-eslint/eslint-plugin": "4.5.0",
     "@typescript-eslint/parser": "4.5.0",
     "eslint": "7.12.0",
     "eslint-config-prettier": "6.14.0",
-    "eslint-plugin-jest": "^24.1.3",
-    "eslint-plugin-prettier": "^3.3.0",
-    "js-green-licenses": "^2.0.1",
+    "eslint-plugin-jest": "24.1.3",
+    "eslint-plugin-prettier": "3.3.0",
+    "jest": "26.6.3",
+    "jest-image-snapshot": "4.2.0",
+    "js-green-licenses": "2.0.1",
     "npm-run-all": "4.1.5",
     "prettier": "2.1.2",
+    "puppeteer": "5.5.0",
     "stylelint": "13.8.0",
     "stylelint-config-prettier": "8.0.2",
     "stylelint-config-recommended": "3.0.0",
     "stylelint-prettier": "1.1.2",
+    "ts-jest": "26.4.4",
     "typescript": "4.0.3"
   }
 }