diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..ce72c57
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,13 @@
+{
+    "presets": [[
+        "@babel/preset-env",
+        {
+            "corejs": "3",
+            "useBuiltIns": "usage"
+        }
+    ]],
+    "plugins": [
+        "@babel/plugin-transform-runtime",
+        "@babel/plugin-proposal-class-properties"
+    ]
+}
diff --git a/.eslintrc.js b/.eslintrc.js
index a0062b8..878fe2b 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -28,4 +28,10 @@ module.exports = {
     'vue/no-unused-vars': 0,
     'vue/html-self-closing': 0,
   },
+  globals: {
+    'describe': true,
+    'expect': true,
+    'it': true,
+    'test': true,
+  },
 };
diff --git a/package-lock.json b/package-lock.json
index 034ae7f..7a22fa8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -720,11 +720,11 @@
       }
     },
     "@babel/plugin-proposal-class-properties": {
-      "version": "7.12.1",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.12.1.tgz",
-      "integrity": "sha512-cKp3dlQsFsEs5CWKnN7BnSHOd0EOW8EKpEjkoz1pO2E5KzIDNV9Ros1b0CnmbVgAGXJubOYVBOGCT1OmJwOI7w==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.10.4.tgz",
+      "integrity": "sha512-vhwkEROxzcHGNu2mzUC0OFFNXdZ4M23ib8aRRcJSsW8BZK9pQMD7QB7csl97NBbgGZO7ZyHUyKDnxzOaP4IrCg==",
       "requires": {
-        "@babel/helper-create-class-features-plugin": "^7.12.1",
+        "@babel/helper-create-class-features-plugin": "^7.10.4",
         "@babel/helper-plugin-utils": "^7.10.4"
       }
     },
@@ -837,6 +837,15 @@
         "@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==",
+      "dev": true,
+      "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",
@@ -869,6 +878,15 @@
         "@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==",
+      "dev": true,
+      "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",
@@ -1184,6 +1202,18 @@
         "@babel/helper-plugin-utils": "^7.10.4"
       }
     },
+    "@babel/plugin-transform-runtime": {
+      "version": "7.11.5",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-runtime/-/plugin-transform-runtime-7.11.5.tgz",
+      "integrity": "sha512-9aIoee+EhjySZ6vY5hnLjigHzunBlscx9ANKutkeWTJTx6m5Rbq6Ic01tLvO54lSusR+BxV7u4UDdCmXv5aagg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-module-imports": "^7.10.4",
+        "@babel/helper-plugin-utils": "^7.10.4",
+        "resolve": "^1.8.1",
+        "semver": "^5.5.1"
+      }
+    },
     "@babel/plugin-transform-shorthand-properties": {
       "version": "7.12.1",
       "resolved": "https://registry.npmjs.org/@babel/plugin-transform-shorthand-properties/-/plugin-transform-shorthand-properties-7.12.1.tgz",
@@ -1243,30 +1273,29 @@
       }
     },
     "@babel/preset-env": {
-      "version": "7.12.11",
-      "resolved": "https://registry.npmjs.org/@babel/preset-env/-/preset-env-7.12.11.tgz",
-      "integrity": "sha512-j8Tb+KKIXKYlDBQyIOy4BLxzv1NUOwlHfZ74rvW+Z0Gp4/cI2IMDPBWAgWceGcE7aep9oL/0K9mlzlMGxA8yNw==",
+      "version": "7.11.5",
+      "resolved": "https://registry.npmjs.org/@babel/preset-env/-/preset-env-7.11.5.tgz",
+      "integrity": "sha512-kXqmW1jVcnB2cdueV+fyBM8estd5mlNfaQi6lwLgRwCby4edpavgbFhiBNjmWA3JpB/yZGSISa7Srf+TwxDQoA==",
       "requires": {
-        "@babel/compat-data": "^7.12.7",
-        "@babel/helper-compilation-targets": "^7.12.5",
-        "@babel/helper-module-imports": "^7.12.5",
+        "@babel/compat-data": "^7.11.0",
+        "@babel/helper-compilation-targets": "^7.10.4",
+        "@babel/helper-module-imports": "^7.10.4",
         "@babel/helper-plugin-utils": "^7.10.4",
-        "@babel/helper-validator-option": "^7.12.11",
-        "@babel/plugin-proposal-async-generator-functions": "^7.12.1",
-        "@babel/plugin-proposal-class-properties": "^7.12.1",
-        "@babel/plugin-proposal-dynamic-import": "^7.12.1",
-        "@babel/plugin-proposal-export-namespace-from": "^7.12.1",
-        "@babel/plugin-proposal-json-strings": "^7.12.1",
-        "@babel/plugin-proposal-logical-assignment-operators": "^7.12.1",
-        "@babel/plugin-proposal-nullish-coalescing-operator": "^7.12.1",
-        "@babel/plugin-proposal-numeric-separator": "^7.12.7",
-        "@babel/plugin-proposal-object-rest-spread": "^7.12.1",
-        "@babel/plugin-proposal-optional-catch-binding": "^7.12.1",
-        "@babel/plugin-proposal-optional-chaining": "^7.12.7",
-        "@babel/plugin-proposal-private-methods": "^7.12.1",
-        "@babel/plugin-proposal-unicode-property-regex": "^7.12.1",
+        "@babel/plugin-proposal-async-generator-functions": "^7.10.4",
+        "@babel/plugin-proposal-class-properties": "^7.10.4",
+        "@babel/plugin-proposal-dynamic-import": "^7.10.4",
+        "@babel/plugin-proposal-export-namespace-from": "^7.10.4",
+        "@babel/plugin-proposal-json-strings": "^7.10.4",
+        "@babel/plugin-proposal-logical-assignment-operators": "^7.11.0",
+        "@babel/plugin-proposal-nullish-coalescing-operator": "^7.10.4",
+        "@babel/plugin-proposal-numeric-separator": "^7.10.4",
+        "@babel/plugin-proposal-object-rest-spread": "^7.11.0",
+        "@babel/plugin-proposal-optional-catch-binding": "^7.10.4",
+        "@babel/plugin-proposal-optional-chaining": "^7.11.0",
+        "@babel/plugin-proposal-private-methods": "^7.10.4",
+        "@babel/plugin-proposal-unicode-property-regex": "^7.10.4",
         "@babel/plugin-syntax-async-generators": "^7.8.0",
-        "@babel/plugin-syntax-class-properties": "^7.12.1",
+        "@babel/plugin-syntax-class-properties": "^7.10.4",
         "@babel/plugin-syntax-dynamic-import": "^7.8.0",
         "@babel/plugin-syntax-export-namespace-from": "^7.8.3",
         "@babel/plugin-syntax-json-strings": "^7.8.0",
@@ -1276,60 +1305,46 @@
         "@babel/plugin-syntax-object-rest-spread": "^7.8.0",
         "@babel/plugin-syntax-optional-catch-binding": "^7.8.0",
         "@babel/plugin-syntax-optional-chaining": "^7.8.0",
-        "@babel/plugin-syntax-top-level-await": "^7.12.1",
-        "@babel/plugin-transform-arrow-functions": "^7.12.1",
-        "@babel/plugin-transform-async-to-generator": "^7.12.1",
-        "@babel/plugin-transform-block-scoped-functions": "^7.12.1",
-        "@babel/plugin-transform-block-scoping": "^7.12.11",
-        "@babel/plugin-transform-classes": "^7.12.1",
-        "@babel/plugin-transform-computed-properties": "^7.12.1",
-        "@babel/plugin-transform-destructuring": "^7.12.1",
-        "@babel/plugin-transform-dotall-regex": "^7.12.1",
-        "@babel/plugin-transform-duplicate-keys": "^7.12.1",
-        "@babel/plugin-transform-exponentiation-operator": "^7.12.1",
-        "@babel/plugin-transform-for-of": "^7.12.1",
-        "@babel/plugin-transform-function-name": "^7.12.1",
-        "@babel/plugin-transform-literals": "^7.12.1",
-        "@babel/plugin-transform-member-expression-literals": "^7.12.1",
-        "@babel/plugin-transform-modules-amd": "^7.12.1",
-        "@babel/plugin-transform-modules-commonjs": "^7.12.1",
-        "@babel/plugin-transform-modules-systemjs": "^7.12.1",
-        "@babel/plugin-transform-modules-umd": "^7.12.1",
-        "@babel/plugin-transform-named-capturing-groups-regex": "^7.12.1",
-        "@babel/plugin-transform-new-target": "^7.12.1",
-        "@babel/plugin-transform-object-super": "^7.12.1",
-        "@babel/plugin-transform-parameters": "^7.12.1",
-        "@babel/plugin-transform-property-literals": "^7.12.1",
-        "@babel/plugin-transform-regenerator": "^7.12.1",
-        "@babel/plugin-transform-reserved-words": "^7.12.1",
-        "@babel/plugin-transform-shorthand-properties": "^7.12.1",
-        "@babel/plugin-transform-spread": "^7.12.1",
-        "@babel/plugin-transform-sticky-regex": "^7.12.7",
-        "@babel/plugin-transform-template-literals": "^7.12.1",
-        "@babel/plugin-transform-typeof-symbol": "^7.12.10",
-        "@babel/plugin-transform-unicode-escapes": "^7.12.1",
-        "@babel/plugin-transform-unicode-regex": "^7.12.1",
+        "@babel/plugin-syntax-top-level-await": "^7.10.4",
+        "@babel/plugin-transform-arrow-functions": "^7.10.4",
+        "@babel/plugin-transform-async-to-generator": "^7.10.4",
+        "@babel/plugin-transform-block-scoped-functions": "^7.10.4",
+        "@babel/plugin-transform-block-scoping": "^7.10.4",
+        "@babel/plugin-transform-classes": "^7.10.4",
+        "@babel/plugin-transform-computed-properties": "^7.10.4",
+        "@babel/plugin-transform-destructuring": "^7.10.4",
+        "@babel/plugin-transform-dotall-regex": "^7.10.4",
+        "@babel/plugin-transform-duplicate-keys": "^7.10.4",
+        "@babel/plugin-transform-exponentiation-operator": "^7.10.4",
+        "@babel/plugin-transform-for-of": "^7.10.4",
+        "@babel/plugin-transform-function-name": "^7.10.4",
+        "@babel/plugin-transform-literals": "^7.10.4",
+        "@babel/plugin-transform-member-expression-literals": "^7.10.4",
+        "@babel/plugin-transform-modules-amd": "^7.10.4",
+        "@babel/plugin-transform-modules-commonjs": "^7.10.4",
+        "@babel/plugin-transform-modules-systemjs": "^7.10.4",
+        "@babel/plugin-transform-modules-umd": "^7.10.4",
+        "@babel/plugin-transform-named-capturing-groups-regex": "^7.10.4",
+        "@babel/plugin-transform-new-target": "^7.10.4",
+        "@babel/plugin-transform-object-super": "^7.10.4",
+        "@babel/plugin-transform-parameters": "^7.10.4",
+        "@babel/plugin-transform-property-literals": "^7.10.4",
+        "@babel/plugin-transform-regenerator": "^7.10.4",
+        "@babel/plugin-transform-reserved-words": "^7.10.4",
+        "@babel/plugin-transform-shorthand-properties": "^7.10.4",
+        "@babel/plugin-transform-spread": "^7.11.0",
+        "@babel/plugin-transform-sticky-regex": "^7.10.4",
+        "@babel/plugin-transform-template-literals": "^7.10.4",
+        "@babel/plugin-transform-typeof-symbol": "^7.10.4",
+        "@babel/plugin-transform-unicode-escapes": "^7.10.4",
+        "@babel/plugin-transform-unicode-regex": "^7.10.4",
         "@babel/preset-modules": "^0.1.3",
-        "@babel/types": "^7.12.11",
-        "core-js-compat": "^3.8.0",
+        "@babel/types": "^7.11.5",
+        "browserslist": "^4.12.0",
+        "core-js-compat": "^3.6.2",
+        "invariant": "^2.2.2",
+        "levenary": "^1.1.1",
         "semver": "^5.5.0"
-      },
-      "dependencies": {
-        "@babel/helper-validator-identifier": {
-          "version": "7.12.11",
-          "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz",
-          "integrity": "sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw=="
-        },
-        "@babel/types": {
-          "version": "7.12.11",
-          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.12.11.tgz",
-          "integrity": "sha512-ukA9SQtKThINm++CX1CwmliMrE54J6nIYB5XTwL5f/CLFW9owfls+YSU8tVW15RQ2w+a3fSbPjC6HdQNtWZkiA==",
-          "requires": {
-            "@babel/helper-validator-identifier": "^7.12.11",
-            "lodash": "^4.17.19",
-            "to-fast-properties": "^2.0.0"
-          }
-        }
       }
     },
     "@babel/preset-modules": {
@@ -1345,9 +1360,9 @@
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-      "version": "7.12.5",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.12.5.tgz",
-      "integrity": "sha512-plcc+hbExy3McchJCEQG3knOsuh3HH+Prx1P6cLIkET/0dLuQDEnrT+s27Axgc9bqfsmNUNHfscgMUdBpC9xfg==",
+      "version": "7.11.2",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.11.2.tgz",
+      "integrity": "sha512-TeWkU52so0mPtDcaCTxNBI/IHiz0pZgr8VEFqXFtZWpYD08ZB6FaSwVAS8MKRQAP3bYKiVjwysOJgMFY28o6Tw==",
       "requires": {
         "regenerator-runtime": "^0.13.4"
       }
@@ -1388,6 +1403,22 @@
         "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==",
+      "dev": true
+    },
+    "@cnakazawa/watch": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@cnakazawa/watch/-/watch-1.0.4.tgz",
+      "integrity": "sha512-v9kIhKwjeZThiWrLmj0y17CWoyddASLj9O2yvbZkbvw/N3rWOYy9zkV66ursAoVr0mV15bL8g0c4QZUE6cdDoQ==",
+      "dev": true,
+      "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",
@@ -1500,6 +1531,680 @@
         "postcss": "^7.0.0"
       }
     },
+    "@istanbuljs/load-nyc-config": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
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+      "dev": true,
+      "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",
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+          "dev": true
+        }
+      }
+    },
+    "@istanbuljs/schema": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.2.tgz",
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+        "exec-sh": "^0.3.2",
+        "execa": "^1.0.0",
+        "fb-watchman": "^2.0.0",
+        "micromatch": "^3.1.4",
+        "minimist": "^1.1.1",
+        "walker": "~1.0.5"
+      },
+      "dependencies": {
+        "anymatch": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
+          "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
+          "dev": true,
+          "requires": {
+            "micromatch": "^3.1.4",
+            "normalize-path": "^2.1.1"
+          }
+        },
+        "normalize-path": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
+          "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
+          "dev": true,
+          "requires": {
+            "remove-trailing-separator": "^1.0.1"
+          }
+        }
+      }
+    },
     "sass": {
       "version": "1.30.0",
       "resolved": "https://registry.npmjs.org/sass/-/sass-1.30.0.tgz",
@@ -12007,6 +15084,13 @@
       "integrity": "sha1-7GIRvtGSBEIIj+D3Cyg3Iy7SyKg=",
       "dev": true
     },
+    "shellwords": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/shellwords/-/shellwords-0.1.1.tgz",
+      "integrity": "sha512-vFwSUfQvqybiICwZY5+DAWIPLKsWO31Q91JSKl3UYv+K5c2QRPzn0qzec6QPu1Qc9eHYItiP3NdJqNVqetYAww==",
+      "dev": true,
+      "optional": true
+    },
     "signal-exit": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.3.tgz",
@@ -12043,6 +15127,12 @@
         "totalist": "^1.0.0"
       }
     },
+    "sisteransi": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/sisteransi/-/sisteransi-1.0.5.tgz",
+      "integrity": "sha512-bLGGlR1QxBcynn2d5YmDX4MGjlZvy2MRBDRNHLJ8VI6l6+9FUiyTFNJ0IveOSP0bcXgVDPRcfGqA0pjaqUpfVg==",
+      "dev": true
+    },
     "slash": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-1.0.0.tgz",
@@ -12387,6 +15477,23 @@
       "resolved": "https://registry.npmjs.org/stable/-/stable-0.1.8.tgz",
       "integrity": "sha512-ji9qxRnOVfcuLDySj9qzhGSEFVobyt1kIOSkj1qZzYLzq7Tos/oUUWvotUPQLlrsidqsK6tBH89Bc9kL5zHA6w=="
     },
+    "stack-utils": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/stack-utils/-/stack-utils-2.0.3.tgz",
+      "integrity": "sha512-gL//fkxfWUsIlFL2Tl42Cl6+HFALEaB1FU76I/Fy+oZjRreP7OPMXFlGbxM7NQsI0ZpUfw76sHnv0WNYuTb7Iw==",
+      "dev": true,
+      "requires": {
+        "escape-string-regexp": "^2.0.0"
+      },
+      "dependencies": {
+        "escape-string-regexp": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-2.0.0.tgz",
+          "integrity": "sha512-UpzcLCXolUWcNu5HtVMHYdXJjArjsF9C0aNnquZYY4uW/Vu0miy5YoWvbV345HauVvcAUnpRuhMMcqTcGOY2+w==",
+          "dev": true
+        }
+      }
+    },
     "stackframe": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/stackframe/-/stackframe-1.2.0.tgz",
@@ -12533,6 +15640,33 @@
       "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM=",
       "dev": true
     },
+    "string-length": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/string-length/-/string-length-4.0.1.tgz",
+      "integrity": "sha512-PKyXUd0LK0ePjSOnWn34V2uD6acUWev9uy0Ft05k0E8xRW+SKcA0F7eMr7h5xlzfn+4O3N+55rduYyet3Jk+jw==",
+      "dev": true,
+      "requires": {
+        "char-regex": "^1.0.2",
+        "strip-ansi": "^6.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^5.0.0"
+          }
+        }
+      }
+    },
     "string-similarity": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/string-similarity/-/string-similarity-4.0.3.tgz",
@@ -12606,6 +15740,12 @@
         "ansi-regex": "^2.0.0"
       }
     },
+    "strip-bom": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-4.0.0.tgz",
+      "integrity": "sha512-3xurFv5tEgii33Zi8Jtp55wEIILR9eh34FAW00PZf+JnSsTmV/ioewSgQl97JHvgjoRGwPShsWm+IdrxB35d0w==",
+      "dev": true
+    },
     "strip-eof": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
@@ -12663,6 +15803,33 @@
         }
       }
     },
+    "supports-hyperlinks": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/supports-hyperlinks/-/supports-hyperlinks-2.1.0.tgz",
+      "integrity": "sha512-zoE5/e+dnEijk6ASB6/qrK+oYdm2do1hjoLWrqUC/8WEIW1gbxFcKuBof7sW8ArN6e+AYvsE8HBGiVRWL/F5CA==",
+      "dev": true,
+      "requires": {
+        "has-flag": "^4.0.0",
+        "supports-color": "^7.0.0"
+      },
+      "dependencies": {
+        "has-flag": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+          "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^4.0.0"
+          }
+        }
+      }
+    },
     "svgo": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/svgo/-/svgo-1.3.2.tgz",
@@ -12765,6 +15932,33 @@
       "resolved": "https://registry.npmjs.org/tarts/-/tarts-1.0.0.tgz",
       "integrity": "sha512-w9WFDCa4Pd1CRYdWMXEHAhQMC8+wAUugFINRv8/2v+wjBOSShwtfls0y0pssRks0jW/CvvarMumlIbOkvt7+ZA=="
     },
+    "terminal-link": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/terminal-link/-/terminal-link-2.1.1.tgz",
+      "integrity": "sha512-un0FmiRUQNr5PJqy9kP7c40F5BOfpGlYTrxonDChEZB7pzZxRNp/bt+ymiy9/npwXya9KH99nJ/GXFIiUkYGFQ==",
+      "dev": true,
+      "requires": {
+        "ansi-escapes": "^4.2.1",
+        "supports-hyperlinks": "^2.0.0"
+      },
+      "dependencies": {
+        "ansi-escapes": {
+          "version": "4.3.1",
+          "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
+          "integrity": "sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.11.0"
+          }
+        },
+        "type-fest": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
+          "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
+          "dev": true
+        }
+      }
+    },
     "terser": {
       "version": "4.8.0",
       "resolved": "https://registry.npmjs.org/terser/-/terser-4.8.0.tgz",
@@ -12820,6 +16014,17 @@
         }
       }
     },
+    "test-exclude": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
+      "integrity": "sha512-cAGWPIyOHU6zlmg88jwm7VRyXnMN7iV68OGAbYDk/Mh/xC/pzVPlQtY6ngoIH/5/tciuhGfvESU8GrHrcxD56w==",
+      "dev": true,
+      "requires": {
+        "@istanbuljs/schema": "^0.1.2",
+        "glob": "^7.1.4",
+        "minimatch": "^3.0.4"
+      }
+    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -12855,6 +16060,12 @@
         "neo-async": "^2.6.0"
       }
     },
+    "throat": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/throat/-/throat-5.0.0.tgz",
+      "integrity": "sha512-fcwX4mndzpLQKBS1DVYhGAcYaYt7vsHNIvQV+WXMvnow5cgjPphq5CaayLaGsjRdSCKZFNGt7/GYAuXaNOiYCA==",
+      "dev": true
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -12899,6 +16110,12 @@
       "resolved": "https://registry.npmjs.org/tiny-inflate/-/tiny-inflate-1.0.3.tgz",
       "integrity": "sha512-pkY1fj1cKHb2seWDy0B16HeWyczlJA9/WW3u3c4z/NiWDsO3DOU5D7nhTLE9CF0yXv/QZFY7sEJmj24dK+Rrqw=="
     },
+    "tmpl": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",
+      "integrity": "sha1-I2QN17QtAEM5ERQIIOXPRA5SHdE=",
+      "dev": true
+    },
     "to-arraybuffer": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz",
@@ -13031,6 +16248,12 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true
+    },
     "type-fest": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.6.0.tgz",
@@ -13052,6 +16275,15 @@
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
     },
+    "typedarray-to-buffer": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
+      "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
+      "dev": true,
+      "requires": {
+        "is-typedarray": "^1.0.0"
+      }
+    },
     "uglify-js": {
       "version": "3.4.10",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.4.10.tgz",
@@ -13526,6 +16758,25 @@
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.2.0.tgz",
       "integrity": "sha512-gTpR5XQNKFwOd4clxfnhaqvfqMpqEwr4tOtCyz4MtYZX2JYhfr1JvBFKdS+7K/9rfpZR3VLX+YWBbKoxCgS43Q=="
     },
+    "v8-to-istanbul": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-7.0.0.tgz",
+      "integrity": "sha512-fLL2rFuQpMtm9r8hrAV2apXX/WqHJ6+IC4/eQVdMDGBUgH/YMV4Gv3duk3kjmyg6uiQWBAA9nJwue4iJUOkHeA==",
+      "dev": true,
+      "requires": {
+        "@types/istanbul-lib-coverage": "^2.0.1",
+        "convert-source-map": "^1.6.0",
+        "source-map": "^0.7.3"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.7.3",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.3.tgz",
+          "integrity": "sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==",
+          "dev": true
+        }
+      }
+    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -13804,6 +17055,15 @@
         "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=",
+      "dev": true,
+      "requires": {
+        "makeerror": "1.0.x"
+      }
+    },
     "watchpack": {
       "version": "1.7.5",
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.7.5.tgz",
@@ -14660,6 +17920,18 @@
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
+    "write-file-atomic": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
+      "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
+      "dev": true,
+      "requires": {
+        "imurmurhash": "^0.1.4",
+        "is-typedarray": "^1.0.0",
+        "signal-exit": "^3.0.2",
+        "typedarray-to-buffer": "^3.1.5"
+      }
+    },
     "ws": {
       "version": "6.2.1",
       "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
diff --git a/package.json b/package.json
index e6bb852..4a5775f 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,8 @@
     "dev:tool": "vue-cli-service serve src/nginxconfig/mount.js",
     "analyze": "npm run build:tool -- --analyze",
     "deploy:spaces:comment": "do-vue comment nginxconfig",
-    "test": "npm run test:eslint && npm run test:sass-lint && npm run test:i18n-packs",
+    "test": "npm run test:eslint && npm run test:sass-lint && npm run test:i18n-packs && npm run test:jest",
+    "test:jest": "jest /test/.*.js?$",
     "test:fix": "npm run test:eslint:fix && npm run test:sass-lint:fix",
     "test:eslint": "eslint 'src/**/*.{js,vue}'",
     "test:eslint:fix": "npm run test:eslint -- --fix",
@@ -27,6 +28,9 @@
     "test:sass-lint:fix": "sass-lint-auto-fix 'src/**/*.scss'",
     "test:i18n-packs": "node -r esm src/nginxconfig/i18n/verify.js"
   },
+  "jest": {
+    "testRegex": "/test/.*.js?$"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/digitalocean/nginxconfig.io.git"
@@ -57,13 +61,19 @@
     "vue-select": "^3.10.8"
   },
   "devDependencies": {
+    "@babel/plugin-proposal-class-properties": "^7.10.4",
+    "@babel/plugin-transform-runtime": "^7.11.5",
+    "@babel/preset-env": "^7.11.5",
+    "@babel/runtime": "^7.11.2",
     "@vue/cli-service": "^4.5.9",
     "babel-eslint": "^10.1.0",
     "chalk": "^4.1.0",
     "copyfiles": "^2.4.1",
+    "core-js": "^3.6.5",
     "duplicate-package-checker-webpack-plugin": "^3.0.0",
     "eslint": "^7.15.0",
     "eslint-plugin-vue": "^7.3.0",
+    "jest": "^26.6.3",
     "esm": "^3.2.25",
     "node-fetch": "^2.6.1",
     "sass": "^1.30.0",
diff --git a/src/nginxconfig/util/browser_language.js b/src/nginxconfig/util/browser_language.js
index 0da2614..ec3237c 100644
--- a/src/nginxconfig/util/browser_language.js
+++ b/src/nginxconfig/util/browser_language.js
@@ -38,7 +38,8 @@ export default () => {
         if (typeof window.navigator.language === 'string')
             userLocales.add(window.navigator.language);
         if (Intl && 'DateTimeFormat' in Intl)
-            userLocales.add(Intl.DateTimeFormat().resolvedOptions().locale);
+            if (Intl.DateTimeFormat().resolvedOptions().locale !== 'und')
+                userLocales.add(Intl.DateTimeFormat().resolvedOptions().locale);
 
         // Try to find an exact region/language match
         const i18nPackLocales = Object.keys(i18nPacks);
@@ -53,7 +54,9 @@ export default () => {
         }, {});
 
         // Try to match a user language to a pack language
-        const langMatch = [...userLocales.values()].find(x => i18nPackLanguages.includes(x.split('-')[0].toLowerCase()));
+        const langMatch = [...userLocales.values()].find(x => Object.keys(i18nPackLanguages).includes(x.split('-')[0].toLowerCase()));
         if (langMatch) return i18nPackLanguages[langMatch.split('-')[0].toLowerCase()];
+
+        return false;
     }
 };
diff --git a/test/testBrowserLanguage.js b/test/testBrowserLanguage.js
new file mode 100644
index 0000000..8628af2
--- /dev/null
+++ b/test/testBrowserLanguage.js
@@ -0,0 +1,171 @@
+/*
+Copyright 2020 DigitalOcean
+
+This code is licensed under the MIT License.
+You may obtain a copy of the License at
+https://github.com/digitalocean/nginxconfig.io/blob/master/LICENSE or https://mit-license.org/
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+import browserLanguage from '../src/nginxconfig/util/browser_language';
+
+class MockLocales {
+    static languages = [];
+
+    static language = null;
+
+    static IntlBackup = null;
+
+    static navigator = null;
+
+    static setNavigatorLanguages(langs) {
+        MockLocales.languages = langs;
+        return this;
+    }
+
+    static setNavigatorLanguage(lang) {
+        MockLocales.language = lang;
+        return this;
+    }
+
+    static setDateTimeLocale(locale) {
+        const newDateTimeFormat = new Intl.DateTimeFormat(locale);
+        MockLocales.IntlBackup = Intl;
+        if (!locale) {
+            // eslint-disable-next-line no-global-assign
+            Intl = undefined;
+            return this;
+        }
+
+        // eslint-disable-next-line no-global-assign
+        Intl = {
+            DateTimeFormat() {
+                return newDateTimeFormat;
+            },
+        };
+        return this;
+    }
+
+    static restoreDateTimeLocale() {
+        // eslint-disable-next-line no-global-assign
+        Intl = MockLocales.IntlBackup;
+        MockLocales.IntlBackup = null;
+        return this;
+    }
+
+    static setNavigator(navigator) {
+        MockLocales.navigator = window.navigator;
+        window.navigator = navigator;
+        return this;
+    }
+
+    static restoreNavigator() {
+        window.navigator = MockLocales.navigator;
+        MockLocales.navigator = null;
+        return this;
+    }
+}
+
+Object.defineProperty(window.navigator, 'languages', { get: () => {
+    return MockLocales.languages || [];
+}});
+
+Object.defineProperty(window.navigator, 'language', { get: () => {
+    return MockLocales.language || null;
+}});
+
+
+describe('browserLanguage', () => {
+    test('Selects the first available exact match for language/region', () => {
+        MockLocales.setDateTimeLocale(undefined);
+
+        MockLocales.setNavigatorLanguages(['zh-CN', 'zh','en-US','en']);
+        expect(browserLanguage()).toEqual('zhCN');
+
+        MockLocales.setNavigatorLanguages(['zh-TW','zh','en-US','en']);
+        expect(browserLanguage()).toEqual('zhTW');
+
+        MockLocales.setNavigatorLanguages(['zh', 'en-US', 'en']);
+        expect(browserLanguage()).toEqual('en');
+
+        MockLocales.restoreDateTimeLocale();
+    });
+
+    test('Selects the first available language match based on language/region',() => {
+        MockLocales.setDateTimeLocale(undefined);
+
+        MockLocales.setNavigatorLanguages(['ja-JP', 'ja', 'en-US']);
+        expect(browserLanguage()).toEqual('en');
+
+        MockLocales.restoreDateTimeLocale();
+    });
+
+    test('Selects the first available language match based on language alone',() => {
+        MockLocales.setDateTimeLocale(undefined);
+
+        MockLocales.setNavigatorLanguages(['ja-JP', 'ja', 'zh']);
+        expect(browserLanguage()).toEqual('zhCN');
+
+        MockLocales.restoreDateTimeLocale();
+    });
+
+    test('Returns false when there is no available match',() => {
+        MockLocales.setDateTimeLocale(undefined);
+
+        MockLocales.setNavigatorLanguages(['ja-JP','ja']);
+        expect(browserLanguage()).toBeFalsy();
+
+        MockLocales.restoreDateTimeLocale();
+    });
+
+    describe('Different sources for user locale', () => {
+        test('language, languages and and Intl locale are `undefined`',() => {
+            MockLocales.setNavigatorLanguages(undefined);
+            MockLocales.setNavigatorLanguage(undefined);
+            MockLocales.setDateTimeLocale(undefined);
+            expect(browserLanguage()).toBeFalsy();
+            MockLocales.restoreDateTimeLocale();
+        });
+
+        test('language is `en`, languages and Intl locale are `undefined`',() => {
+            MockLocales.setNavigatorLanguage('en');
+            MockLocales.setNavigatorLanguages(undefined);
+            MockLocales.setDateTimeLocale(undefined);
+            expect(browserLanguage()).toEqual('en');
+            MockLocales.restoreDateTimeLocale();
+        });
+
+        test('language and Intl locale are `undefined`, languages is `en-US, en`',() => {
+            MockLocales.setNavigatorLanguage(undefined);
+            MockLocales.setNavigatorLanguages(['en-US','en']);
+            MockLocales.setDateTimeLocale(undefined);
+            expect(browserLanguage()).toEqual('en');
+            MockLocales.restoreDateTimeLocale();
+        });
+
+        test('navigator is `undefined` and Intl locale is `en-US`',() => {
+            MockLocales.setNavigator(undefined);
+            MockLocales.setDateTimeLocale('en-US');
+            expect(browserLanguage()).toEqual('en');
+            MockLocales.restoreDateTimeLocale();
+            MockLocales.restoreNavigator();
+        });
+    });
+});