diff --git a/.gitignore b/.gitignore
index eb5a16c..5ad19c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 build/
+coverage/
 node_modules/
 vendor/
diff --git a/README.md b/README.md
index 060aa1c..598dd96 100644
--- a/README.md
+++ b/README.md
@@ -29,5 +29,6 @@ More details can be found in the [WordPress Plugin Directory](https://wordpress.
 
 ### Other commands
 - Run ESLint: `npm run eslint`
+- Run JavaScript code coverage with tests: `npm run coverage`
 - Run tests: `npm test`
 - Delete build folder: `gulp clean`
diff --git a/package-lock.json b/package-lock.json
index ceaba4d..c17158e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "connector-mobilizon",
-  "version": "0.2.2",
+  "version": "0.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "connector-mobilizon",
-      "version": "0.2.2",
+      "version": "0.3.0",
       "license": "Apache-2.0",
       "dependencies": {
         "graphql": "^15.5.0",
@@ -16,6 +16,7 @@
       },
       "devDependencies": {
         "ava": "^3.15.0",
+        "c8": "^7.7.1",
         "del": "^6.0.0",
         "eslint": "^7.23.0",
         "eslint-plugin-ava": "^12.0.0",
@@ -48,16 +49,22 @@
       "dev": true
     },
     "node_modules/@babel/highlight": {
-      "version": "7.10.4",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
-      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
+      "version": "7.13.10",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.13.10.tgz",
+      "integrity": "sha512-5aPpe5XQPzflQrFwL1/QoeHkP2MsA4JCntcXHRhEsdsfPVkvPi2w7Qix4iV7t5S/oC9OodGrggd8aco1g3SZFg==",
       "dev": true,
       "dependencies": {
-        "@babel/helper-validator-identifier": "^7.10.4",
+        "@babel/helper-validator-identifier": "^7.12.11",
         "chalk": "^2.0.0",
         "js-tokens": "^4.0.0"
       }
     },
+    "node_modules/@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
+    },
     "node_modules/@concordance/react": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/@concordance/react/-/react-2.0.0.tgz",
@@ -153,6 +160,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/@istanbuljs/schema": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.3.tgz",
+      "integrity": "sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz",
@@ -235,6 +251,18 @@
       "integrity": "sha512-laIjwTQaD+5DukBZaygQ79K1Z0jb1bPEMRrkXSLjtCcZm+abyp5YbrqpSLzD42FwWW6gK/aS4NYpJ804nG2brg==",
       "dev": true
     },
+    "node_modules/@types/is-windows": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/is-windows/-/is-windows-1.0.0.tgz",
+      "integrity": "sha512-tJ1rq04tGKuIJoWIH0Gyuwv4RQ3+tIu7wQrC0MV47raQ44kIzXSSFKfrxFUOWVRvesoF7mrTqigXmqoZJsXwTg==",
+      "dev": true
+    },
+    "node_modules/@types/istanbul-lib-coverage": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.3.tgz",
+      "integrity": "sha512-sz7iLqvVUg1gIedBOvlkxPlc8/uVzyS5OwGz1cKjXzkl3FpL3al0crU8YGU1WoHkxn0Wxbw5tyi6hvzJKNzFsw==",
+      "dev": true
+    },
     "node_modules/@types/json-schema": {
       "version": "7.0.7",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.7.tgz",
@@ -1697,6 +1725,79 @@
       "integrity": "sha1-hZgoeOIbmOHGZCXgPQF0eI9Wnug=",
       "dev": true
     },
+    "node_modules/c8": {
+      "version": "7.7.1",
+      "resolved": "https://registry.npmjs.org/c8/-/c8-7.7.1.tgz",
+      "integrity": "sha512-OO9KpDGv1iTd/MBNUForJH7vPKt9XnRPWSBKeRJGma4xfTaKBObA0zWAplFpFRuf/qRmATFqGFrzxqDk51LXsw==",
+      "dev": true,
+      "dependencies": {
+        "@bcoe/v8-coverage": "^0.2.3",
+        "@istanbuljs/schema": "^0.1.2",
+        "find-up": "^5.0.0",
+        "foreground-child": "^2.0.0",
+        "furi": "^2.0.0",
+        "istanbul-lib-coverage": "^3.0.0",
+        "istanbul-lib-report": "^3.0.0",
+        "istanbul-reports": "^3.0.2",
+        "rimraf": "^3.0.0",
+        "test-exclude": "^6.0.0",
+        "v8-to-istanbul": "^7.1.0",
+        "yargs": "^16.2.0",
+        "yargs-parser": "^20.2.7"
+      },
+      "bin": {
+        "c8": "bin/c8.js"
+      },
+      "engines": {
+        "node": ">=10.12.0"
+      }
+    },
+    "node_modules/c8/node_modules/find-up": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-5.0.0.tgz",
+      "integrity": "sha512-78/PXT1wlLLDgTzDs7sjq9hzz0vXD+zn+7wypEe4fXQxCmdmqfGsEPQxmiCSQI3ajFV91bVSsvNtrJRiW6nGng==",
+      "dev": true,
+      "dependencies": {
+        "locate-path": "^6.0.0",
+        "path-exists": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/c8/node_modules/locate-path": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-6.0.0.tgz",
+      "integrity": "sha512-iPZK6eYjbxRu3uB4/WZ3EsEIMJFMqAoopl3R+zuq0UjcAm/MO6KCweDgPfP3elTztoKP3KtnVHxTn2NHBSDVUw==",
+      "dev": true,
+      "dependencies": {
+        "p-locate": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/c8/node_modules/p-locate": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-5.0.0.tgz",
+      "integrity": "sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw==",
+      "dev": true,
+      "dependencies": {
+        "p-limit": "^3.0.2"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/cacache": {
       "version": "12.0.4",
       "resolved": "https://registry.npmjs.org/cacache/-/cacache-12.0.4.tgz",
@@ -4284,6 +4385,19 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/foreground-child": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-2.0.0.tgz",
+      "integrity": "sha512-dCIq9FpEcyQyXKCkyzmlPTFNgrCzPudOe+mhvJU5zAtlBnGVy2yKxtfsxK2tQBThwq225jcvBjpw1Gr40uzZCA==",
+      "dev": true,
+      "dependencies": {
+        "cross-spawn": "^7.0.0",
+        "signal-exit": "^3.0.2"
+      },
+      "engines": {
+        "node": ">=8.0.0"
+      }
+    },
     "node_modules/forever-agent": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
@@ -4384,6 +4498,16 @@
       "integrity": "sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc=",
       "dev": true
     },
+    "node_modules/furi": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/furi/-/furi-2.0.0.tgz",
+      "integrity": "sha512-uKuNsaU0WVaK/vmvj23wW1bicOFfyqSsAIH71bRZx8kA4Xj+YCHin7CJKJJjkIsmxYaPFLk9ljmjEyB7xF7WvQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/is-windows": "^1.0.0",
+        "is-windows": "^1.0.2"
+      }
+    },
     "node_modules/get-caller-file": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
@@ -5357,6 +5481,12 @@
         "node": ">=10"
       }
     },
+    "node_modules/html-escaper": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/html-escaper/-/html-escaper-2.0.2.tgz",
+      "integrity": "sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==",
+      "dev": true
+    },
     "node_modules/http-cache-semantics": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/http-cache-semantics/-/http-cache-semantics-4.1.0.tgz",
@@ -6046,6 +6176,42 @@
       "integrity": "sha1-R+Y/evVa+m+S4VAOaQ64uFKcCZo=",
       "dev": true
     },
+    "node_modules/istanbul-lib-coverage": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-coverage/-/istanbul-lib-coverage-3.0.0.tgz",
+      "integrity": "sha512-UiUIqxMgRDET6eR+o5HbfRYP1l0hqkWOs7vNxC/mggutCMUIhWMm8gAHb8tHlyfD3/l6rlgNA5cKdDzEAf6hEg==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/istanbul-lib-report": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-report/-/istanbul-lib-report-3.0.0.tgz",
+      "integrity": "sha512-wcdi+uAKzfiGT2abPpKZ0hSU1rGQjUQnLvtY5MpQ7QCTahD3VODhcu4wcfY1YtkGaDD5yuydOLINXsfbus9ROw==",
+      "dev": true,
+      "dependencies": {
+        "istanbul-lib-coverage": "^3.0.0",
+        "make-dir": "^3.0.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/istanbul-reports": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/istanbul-reports/-/istanbul-reports-3.0.2.tgz",
+      "integrity": "sha512-9tZvz7AiR3PEDNGiV9vIouQ/EAcqMXFmkcA1CDFTwOB98OZVDL0PH9glHotf5Ugp6GCOTypfzGWI/OqjWNCRUw==",
+      "dev": true,
+      "dependencies": {
+        "html-escaper": "^2.0.0",
+        "istanbul-lib-report": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/istextorbinary": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/istextorbinary/-/istextorbinary-2.2.1.tgz",
@@ -9824,6 +9990,20 @@
         "node": ">= 8"
       }
     },
+    "node_modules/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,
+      "dependencies": {
+        "@istanbuljs/schema": "^0.1.2",
+        "glob": "^7.1.4",
+        "minimatch": "^3.0.4"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -10416,6 +10596,29 @@
       "integrity": "sha512-l8lCEmLcLYZh4nbunNZvQCJc5pv7+RCwa8q/LdUx8u7lsWvPDKmpodJAJNwkAhJC//dFY48KuIEmjtd4RViDrA==",
       "dev": true
     },
+    "node_modules/v8-to-istanbul": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-7.1.1.tgz",
+      "integrity": "sha512-p0BB09E5FRjx0ELN6RgusIPsSPhtgexSRcKETybEs6IGOTXJSZqfwxp7r//55nnu0f1AxltY5VvdVqy2vZf9AA==",
+      "dev": true,
+      "dependencies": {
+        "@types/istanbul-lib-coverage": "^2.0.1",
+        "convert-source-map": "^1.6.0",
+        "source-map": "^0.7.3"
+      },
+      "engines": {
+        "node": ">=10.10.0"
+      }
+    },
+    "node_modules/v8-to-istanbul/node_modules/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,
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/v8flags": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.2.0.tgz",
@@ -11662,9 +11865,9 @@
       }
     },
     "node_modules/yargs-parser": {
-      "version": "20.2.4",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
-      "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA==",
+      "version": "20.2.7",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.7.tgz",
+      "integrity": "sha512-FiNkvbeHzB/syOjIUxFDCnhSfzAL8R5vs40MgLFBorXACCOAEaWu0gRZl14vG8MR9AOJIZbmkjhusqBYZ3HTHw==",
       "dev": true,
       "engines": {
         "node": ">=10"
@@ -11697,16 +11900,22 @@
       "dev": true
     },
     "@babel/highlight": {
-      "version": "7.10.4",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
-      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
+      "version": "7.13.10",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.13.10.tgz",
+      "integrity": "sha512-5aPpe5XQPzflQrFwL1/QoeHkP2MsA4JCntcXHRhEsdsfPVkvPi2w7Qix4iV7t5S/oC9OodGrggd8aco1g3SZFg==",
       "dev": true,
       "requires": {
-        "@babel/helper-validator-identifier": "^7.10.4",
+        "@babel/helper-validator-identifier": "^7.12.11",
         "chalk": "^2.0.0",
         "js-tokens": "^4.0.0"
       }
     },
+    "@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
+    },
     "@concordance/react": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/@concordance/react/-/react-2.0.0.tgz",
@@ -11776,6 +11985,12 @@
         }
       }
     },
+    "@istanbuljs/schema": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.3.tgz",
+      "integrity": "sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA==",
+      "dev": true
+    },
     "@nodelib/fs.scandir": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz",
@@ -11843,6 +12058,18 @@
       "integrity": "sha512-laIjwTQaD+5DukBZaygQ79K1Z0jb1bPEMRrkXSLjtCcZm+abyp5YbrqpSLzD42FwWW6gK/aS4NYpJ804nG2brg==",
       "dev": true
     },
+    "@types/is-windows": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/is-windows/-/is-windows-1.0.0.tgz",
+      "integrity": "sha512-tJ1rq04tGKuIJoWIH0Gyuwv4RQ3+tIu7wQrC0MV47raQ44kIzXSSFKfrxFUOWVRvesoF7mrTqigXmqoZJsXwTg==",
+      "dev": true
+    },
+    "@types/istanbul-lib-coverage": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.3.tgz",
+      "integrity": "sha512-sz7iLqvVUg1gIedBOvlkxPlc8/uVzyS5OwGz1cKjXzkl3FpL3al0crU8YGU1WoHkxn0Wxbw5tyi6hvzJKNzFsw==",
+      "dev": true
+    },
     "@types/json-schema": {
       "version": "7.0.7",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.7.tgz",
@@ -13122,6 +13349,57 @@
       "integrity": "sha1-hZgoeOIbmOHGZCXgPQF0eI9Wnug=",
       "dev": true
     },
+    "c8": {
+      "version": "7.7.1",
+      "resolved": "https://registry.npmjs.org/c8/-/c8-7.7.1.tgz",
+      "integrity": "sha512-OO9KpDGv1iTd/MBNUForJH7vPKt9XnRPWSBKeRJGma4xfTaKBObA0zWAplFpFRuf/qRmATFqGFrzxqDk51LXsw==",
+      "dev": true,
+      "requires": {
+        "@bcoe/v8-coverage": "^0.2.3",
+        "@istanbuljs/schema": "^0.1.2",
+        "find-up": "^5.0.0",
+        "foreground-child": "^2.0.0",
+        "furi": "^2.0.0",
+        "istanbul-lib-coverage": "^3.0.0",
+        "istanbul-lib-report": "^3.0.0",
+        "istanbul-reports": "^3.0.2",
+        "rimraf": "^3.0.0",
+        "test-exclude": "^6.0.0",
+        "v8-to-istanbul": "^7.1.0",
+        "yargs": "^16.2.0",
+        "yargs-parser": "^20.2.7"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-5.0.0.tgz",
+          "integrity": "sha512-78/PXT1wlLLDgTzDs7sjq9hzz0vXD+zn+7wypEe4fXQxCmdmqfGsEPQxmiCSQI3ajFV91bVSsvNtrJRiW6nGng==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^6.0.0",
+            "path-exists": "^4.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-6.0.0.tgz",
+          "integrity": "sha512-iPZK6eYjbxRu3uB4/WZ3EsEIMJFMqAoopl3R+zuq0UjcAm/MO6KCweDgPfP3elTztoKP3KtnVHxTn2NHBSDVUw==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^5.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-5.0.0.tgz",
+          "integrity": "sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^3.0.2"
+          }
+        }
+      }
+    },
     "cacache": {
       "version": "12.0.4",
       "resolved": "https://registry.npmjs.org/cacache/-/cacache-12.0.4.tgz",
@@ -15267,6 +15545,16 @@
         "for-in": "^1.0.1"
       }
     },
+    "foreground-child": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-2.0.0.tgz",
+      "integrity": "sha512-dCIq9FpEcyQyXKCkyzmlPTFNgrCzPudOe+mhvJU5zAtlBnGVy2yKxtfsxK2tQBThwq225jcvBjpw1Gr40uzZCA==",
+      "dev": true,
+      "requires": {
+        "cross-spawn": "^7.0.0",
+        "signal-exit": "^3.0.2"
+      }
+    },
     "forever-agent": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
@@ -15349,6 +15637,16 @@
       "integrity": "sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc=",
       "dev": true
     },
+    "furi": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/furi/-/furi-2.0.0.tgz",
+      "integrity": "sha512-uKuNsaU0WVaK/vmvj23wW1bicOFfyqSsAIH71bRZx8kA4Xj+YCHin7CJKJJjkIsmxYaPFLk9ljmjEyB7xF7WvQ==",
+      "dev": true,
+      "requires": {
+        "@types/is-windows": "^1.0.0",
+        "is-windows": "^1.0.2"
+      }
+    },
     "get-caller-file": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
@@ -16152,6 +16450,12 @@
         "whatwg-encoding": "^1.0.5"
       }
     },
+    "html-escaper": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/html-escaper/-/html-escaper-2.0.2.tgz",
+      "integrity": "sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==",
+      "dev": true
+    },
     "http-cache-semantics": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/http-cache-semantics/-/http-cache-semantics-4.1.0.tgz",
@@ -16676,6 +16980,33 @@
       "integrity": "sha1-R+Y/evVa+m+S4VAOaQ64uFKcCZo=",
       "dev": true
     },
+    "istanbul-lib-coverage": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-coverage/-/istanbul-lib-coverage-3.0.0.tgz",
+      "integrity": "sha512-UiUIqxMgRDET6eR+o5HbfRYP1l0hqkWOs7vNxC/mggutCMUIhWMm8gAHb8tHlyfD3/l6rlgNA5cKdDzEAf6hEg==",
+      "dev": true
+    },
+    "istanbul-lib-report": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-report/-/istanbul-lib-report-3.0.0.tgz",
+      "integrity": "sha512-wcdi+uAKzfiGT2abPpKZ0hSU1rGQjUQnLvtY5MpQ7QCTahD3VODhcu4wcfY1YtkGaDD5yuydOLINXsfbus9ROw==",
+      "dev": true,
+      "requires": {
+        "istanbul-lib-coverage": "^3.0.0",
+        "make-dir": "^3.0.0",
+        "supports-color": "^7.1.0"
+      }
+    },
+    "istanbul-reports": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/istanbul-reports/-/istanbul-reports-3.0.2.tgz",
+      "integrity": "sha512-9tZvz7AiR3PEDNGiV9vIouQ/EAcqMXFmkcA1CDFTwOB98OZVDL0PH9glHotf5Ugp6GCOTypfzGWI/OqjWNCRUw==",
+      "dev": true,
+      "requires": {
+        "html-escaper": "^2.0.0",
+        "istanbul-lib-report": "^3.0.0"
+      }
+    },
     "istextorbinary": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/istextorbinary/-/istextorbinary-2.2.1.tgz",
@@ -19762,6 +20093,17 @@
         "terser": "^5.5.1"
       }
     },
+    "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",
@@ -20262,6 +20604,25 @@
       "integrity": "sha512-l8lCEmLcLYZh4nbunNZvQCJc5pv7+RCwa8q/LdUx8u7lsWvPDKmpodJAJNwkAhJC//dFY48KuIEmjtd4RViDrA==",
       "dev": true
     },
+    "v8-to-istanbul": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-7.1.1.tgz",
+      "integrity": "sha512-p0BB09E5FRjx0ELN6RgusIPsSPhtgexSRcKETybEs6IGOTXJSZqfwxp7r//55nnu0f1AxltY5VvdVqy2vZf9AA==",
+      "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
+        }
+      }
+    },
     "v8flags": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.2.0.tgz",
@@ -21322,9 +21683,9 @@
       }
     },
     "yargs-parser": {
-      "version": "20.2.4",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
-      "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA==",
+      "version": "20.2.7",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.7.tgz",
+      "integrity": "sha512-FiNkvbeHzB/syOjIUxFDCnhSfzAL8R5vs40MgLFBorXACCOAEaWu0gRZl14vG8MR9AOJIZbmkjhusqBYZ3HTHw==",
       "dev": true
     },
     "yocto-queue": {
diff --git a/package.json b/package.json
index cb7352e..94c6502 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "scripts": {
     "build-dev": "gulp dev",
     "build-prod": "ava && gulp prod",
+    "coverage": "c8 --reporter=html --reporter=text ava",
     "eslint": "npx eslint source/**/*.js",
     "test": "ava"
   },
@@ -26,6 +27,7 @@
   },
   "devDependencies": {
     "ava": "^3.15.0",
+    "c8": "^7.7.1",
     "del": "^6.0.0",
     "eslint": "^7.23.0",
     "eslint-plugin-ava": "^12.0.0",