diff --git a/.gitignore b/.gitignore
index ed37ca5c4..6508c3028 100755
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,11 @@
 /.vscode/*.code-workspace
 /.vscode/settings.json
 
+# codecoverage
+/.nyc_output
+/coverage
+
+
 # misc
 npm-debug.log
 # folders
diff --git a/.nycrc b/.nycrc
new file mode 100644
index 000000000..a99b3eb81
--- /dev/null
+++ b/.nycrc
@@ -0,0 +1,10 @@
+{
+	"extends": "@istanbuljs/nyc-config-typescript",
+	"all": true,
+    "reporter": [
+		"lcovonly",
+		"html",
+		"text",
+		"text-summary"
+    ]
+}
\ No newline at end of file
diff --git a/lib/handlers/authenticate-handler.ts b/lib/handlers/authenticate-handler.ts
index 67b30b0a1..cef0e2c32 100755
--- a/lib/handlers/authenticate-handler.ts
+++ b/lib/handlers/authenticate-handler.ts
@@ -71,9 +71,6 @@ export class AuthenticateHandler {
       );
     }
 
-    // Extend model object with request
-    this.model.request = request;
-
     try {
       let token = await this.getTokenFromRequest(request);
       token = await this.getAccessToken(token);
diff --git a/lib/handlers/authorize-handler.ts b/lib/handlers/authorize-handler.ts
index 93d67a6e9..4a3dcb070 100755
--- a/lib/handlers/authorize-handler.ts
+++ b/lib/handlers/authorize-handler.ts
@@ -83,9 +83,6 @@ export class AuthorizeHandler {
       );
     }
 
-    // Extend model object with request
-    this.model.request = request;
-
     const client = await this.getClient(request);
     const user = await this.getUser(request, response);
 
diff --git a/lib/handlers/revoke-handler.ts b/lib/handlers/revoke-handler.ts
index 0636f99fa..e417a892a 100644
--- a/lib/handlers/revoke-handler.ts
+++ b/lib/handlers/revoke-handler.ts
@@ -73,8 +73,6 @@ export class RevokeHandler {
         'Invalid request: content must be application/x-www-form-urlencoded',
       );
     }
-    // Extend model object with request
-    this.model.request = request;
 
     try {
       const client = await this.getClient(request, response);
diff --git a/lib/handlers/token-handler.ts b/lib/handlers/token-handler.ts
index 66d9ac363..b022b2385 100755
--- a/lib/handlers/token-handler.ts
+++ b/lib/handlers/token-handler.ts
@@ -101,9 +101,6 @@ export class TokenHandler {
       );
     }
 
-    // Extend model object with request
-    this.model.request = request;
-
     try {
       const client = await this.getClient(request, response);
       const data = await this.handleGrantType(request, client);
diff --git a/lib/interfaces/model.interface.ts b/lib/interfaces/model.interface.ts
index 14e880e67..a707f299c 100644
--- a/lib/interfaces/model.interface.ts
+++ b/lib/interfaces/model.interface.ts
@@ -2,7 +2,6 @@ import { AuthorizationCode, Client, RefreshToken, Token, User } from '.';
 import { Request } from '../request';
 
 export interface BaseModel {
-  request: Request;
   /**
    * Invoked to generate a new access token.
    *
diff --git a/package-lock.json b/package-lock.json
index 9d7156cac..b0458a71c 100755
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,126 @@
         "@babel/highlight": "^7.0.0"
       }
     },
+    "@babel/core": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.8.3.tgz",
+      "integrity": "sha512-4XFkf8AwyrEG7Ziu3L2L0Cv+WyY47Tcsp70JFmpftbAA1K7YL/sgE9jh9HyNj08Y/U50ItUchpN0w6HxAoX1rA==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.8.3",
+        "@babel/generator": "^7.8.3",
+        "@babel/helpers": "^7.8.3",
+        "@babel/parser": "^7.8.3",
+        "@babel/template": "^7.8.3",
+        "@babel/traverse": "^7.8.3",
+        "@babel/types": "^7.8.3",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.1",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.13",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+          "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.8.3"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.8.3.tgz",
+          "integrity": "sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==",
+          "dev": true,
+          "requires": {
+            "chalk": "^2.0.0",
+            "esutils": "^2.0.2",
+            "js-tokens": "^4.0.0"
+          }
+        },
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/generator": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.8.3.tgz",
+      "integrity": "sha512-WjoPk8hRpDRqqzRpvaR8/gDUPkrnOOeuT2m8cNICJtZH6mwaCo3v0OKMI7Y6SM1pBtyijnLtAL0HDi41pf41ug==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.8.3",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.13",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.8.3.tgz",
+      "integrity": "sha512-BCxgX1BC2hD/oBlIFUgOCQDOPV8nSINxCwM3o93xP4P9Fq6aV5sgv2cOOITDMtCfQ+3PvHp3l689XZvAM9QyOA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.8.3",
+        "@babel/template": "^7.8.3",
+        "@babel/types": "^7.8.3"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.8.3.tgz",
+      "integrity": "sha512-FVDR+Gd9iLjUMY1fzE2SR0IuaJToR4RkCDARVfsBBPSP53GEqSFjD8gNyxg246VUyc/ALRxFaAK8rVG7UT7xRA==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.8.3"
+      }
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.8.3.tgz",
+      "integrity": "sha512-3x3yOeyBhW851hroze7ElzdkeRXQYQbFIb7gLK1WQYsw2GWDay5gAJNw1sWJ0VFP6z5J1whqeXH/WCdCjZv6dA==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.8.3"
+      }
+    },
+    "@babel/helpers": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.8.3.tgz",
+      "integrity": "sha512-LmU3q9Pah/XyZU89QvBgGt+BCsTPoQa+73RxAQh8fb8qkDyIfeQnmgs+hvzhTCKTzqOyk7JTkS3MS1S8Mq5yrQ==",
+      "dev": true,
+      "requires": {
+        "@babel/template": "^7.8.3",
+        "@babel/traverse": "^7.8.3",
+        "@babel/types": "^7.8.3"
+      }
+    },
     "@babel/highlight": {
       "version": "7.5.0",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
@@ -24,6 +144,167 @@
         "js-tokens": "^4.0.0"
       }
     },
+    "@babel/parser": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.8.3.tgz",
+      "integrity": "sha512-/V72F4Yp/qmHaTALizEm9Gf2eQHV3QyTL3K0cNfijwnMnb1L+LDlAubb/ZnSdGAVzVSWakujHYs1I26x66sMeQ==",
+      "dev": true
+    },
+    "@babel/template": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.8.3.tgz",
+      "integrity": "sha512-04m87AcQgAFdvuoyiQ2kgELr2tV8B4fP/xJAVUL3Yb3bkNdMedD3d0rlSQr3PegP0cms3eHjl1F7PWlvWbU8FQ==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.8.3",
+        "@babel/parser": "^7.8.3",
+        "@babel/types": "^7.8.3"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+          "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.8.3"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.8.3.tgz",
+          "integrity": "sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==",
+          "dev": true,
+          "requires": {
+            "chalk": "^2.0.0",
+            "esutils": "^2.0.2",
+            "js-tokens": "^4.0.0"
+          }
+        }
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.8.3.tgz",
+      "integrity": "sha512-we+a2lti+eEImHmEXp7bM9cTxGzxPmBiVJlLVD+FuuQMeeO7RaDbutbgeheDkw+Xe3mCfJHnGOWLswT74m2IPg==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.8.3",
+        "@babel/generator": "^7.8.3",
+        "@babel/helper-function-name": "^7.8.3",
+        "@babel/helper-split-export-declaration": "^7.8.3",
+        "@babel/parser": "^7.8.3",
+        "@babel/types": "^7.8.3",
+        "debug": "^4.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.13"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+          "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.8.3"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.8.3.tgz",
+          "integrity": "sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==",
+          "dev": true,
+          "requires": {
+            "chalk": "^2.0.0",
+            "esutils": "^2.0.2",
+            "js-tokens": "^4.0.0"
+          }
+        },
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
+    "@babel/types": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.8.3.tgz",
+      "integrity": "sha512-jBD+G8+LWpMBBWvVcdr4QysjUE4mU/syrhN17o1u3gx0/WzJB1kwiVZAXRtWbsIPOwW8pF/YJV5+nmetPzepXg==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2",
+        "lodash": "^4.17.13",
+        "to-fast-properties": "^2.0.0"
+      }
+    },
+    "@istanbuljs/load-nyc-config": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.0.0.tgz",
+      "integrity": "sha512-ZR0rq/f/E4f4XcgnDvtMWXCUJpi8eO0rssVhmztsZqLIEFA9UUP9zmpE0VxlM+kv/E1ul2I876Fwil2ayptDVg==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.3.1",
+        "find-up": "^4.1.0",
+        "js-yaml": "^3.13.1",
+        "resolve-from": "^5.0.0"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
+          "integrity": "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^5.0.0",
+            "path-exists": "^4.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+          "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^4.1.0"
+          }
+        },
+        "p-locate": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+          "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.2.0"
+          }
+        },
+        "path-exists": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
+          "integrity": "sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==",
+          "dev": true
+        }
+      }
+    },
+    "@istanbuljs/nyc-config-typescript": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/nyc-config-typescript/-/nyc-config-typescript-1.0.1.tgz",
+      "integrity": "sha512-/gz6LgVpky205LuoOfwEZmnUtaSmdk0QIMcNFj9OvxhiMhPpKftMgZmGN7jNj7jR+lr8IB1Yks3QSSSNSxfoaQ==",
+      "dev": true,
+      "requires": {
+        "@istanbuljs/schema": "^0.1.2"
+      }
+    },
+    "@istanbuljs/schema": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.2.tgz",
+      "integrity": "sha512-tsAQNx32a8CoFhjhijUIhI4kccIAgmGhy8LZMZgGfmXcpMbPRUqn5LWmgRttILi6yeGmBJd2xsPkFMs0PzgPCw==",
+      "dev": true
+    },
     "@sinonjs/commons": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.6.0.tgz",
@@ -68,6 +349,12 @@
         "@types/node": "*"
       }
     },
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+      "dev": true
+    },
     "@types/mocha": {
       "version": "5.2.7",
       "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.7.tgz",
@@ -98,6 +385,16 @@
         "@types/node": "*"
       }
     },
+    "aggregate-error": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.0.1.tgz",
+      "integrity": "sha512-quoaXsZ9/BLNae5yiNoUz+Nhkwz83GhWwtYFglcjEQB2NDHCIpApbqXxIFnm4Pq/Nvhrsq5sYJFyohrrxnTGAA==",
+      "dev": true,
+      "requires": {
+        "clean-stack": "^2.0.0",
+        "indent-string": "^4.0.0"
+      }
+    },
     "ansi-colors": {
       "version": "3.2.3",
       "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz",
@@ -119,6 +416,21 @@
         "color-convert": "^1.9.0"
       }
     },
+    "append-transform": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-2.0.0.tgz",
+      "integrity": "sha512-7yeyCEurROLQJFv5Xj4lEGTy0borxepjFv1g22oAdqFu//SrAlDl1O1Nxx15SH1RoliUml6p8dwJW9jvZughhg==",
+      "dev": true,
+      "requires": {
+        "default-require-extensions": "^3.0.0"
+      }
+    },
+    "archy": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
+      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
+      "dev": true
+    },
     "arg": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/arg/-/arg-4.1.2.tgz",
@@ -200,6 +512,18 @@
       "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
       "dev": true
     },
+    "caching-transform": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/caching-transform/-/caching-transform-4.0.0.tgz",
+      "integrity": "sha512-kpqOvwXnjjN44D89K5ccQC+RUrsy7jB/XLlRrx0D7/2HNcTPqzsb6XgYoErwko6QsV184CA2YgS1fxDiiDZMWA==",
+      "dev": true,
+      "requires": {
+        "hasha": "^5.0.0",
+        "make-dir": "^3.0.0",
+        "package-hash": "^4.0.0",
+        "write-file-atomic": "^3.0.0"
+      }
+    },
     "camelcase": {
       "version": "5.3.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
@@ -237,6 +561,12 @@
         }
       }
     },
+    "clean-stack": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/clean-stack/-/clean-stack-2.2.0.tgz",
+      "integrity": "sha512-4diC9HaTE+KRAMWhDhrGOECgWZxoevMc5TlkObMqNSsVU62PYzXZ/SMTjzyGAFF1YusgxGcSWTEXBhp0CPwQ1A==",
+      "dev": true
+    },
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+      "integrity": "sha512-NDGVxTsjqfunkds7CqsOiEnxln4Bo7Nddl3XhS4pXg5OzwkLqJ971ZVAAnB+DDLnF76N+VnDEiBHaVV8I06SUg==",
+      "dev": true,
+      "requires": {
+        "glob": "^7.1.3"
+      }
+    },
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
@@ -1107,6 +2113,12 @@
         }
       }
     },
+    "signal-exit": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
+      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
+      "dev": true
+    },
     "sinon": {
       "version": "7.5.0",
       "resolved": "https://registry.npmjs.org/sinon/-/sinon-7.5.0.tgz",
@@ -1149,6 +2161,31 @@
         "source-map": "^0.6.0"
       }
     },
+    "spawn-wrap": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/spawn-wrap/-/spawn-wrap-2.0.0.tgz",
+      "integrity": "sha512-EeajNjfN9zMnULLwhZZQU3GWBoFNkbngTUPfaawT4RkMiviTxcX0qfhVbGey39mfctfDHkWtuecgQ8NJcyQWHg==",
+      "dev": true,
+      "requires": {
+        "foreground-child": "^2.0.0",
+        "is-windows": "^1.0.2",
+        "make-dir": "^3.0.0",
+        "rimraf": "^3.0.0",
+        "signal-exit": "^3.0.2",
+        "which": "^2.0.1"
+      },
+      "dependencies": {
+        "which": {
+          "version": "2.0.2",
+          "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+          "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+          "dev": true,
+          "requires": {
+            "isexe": "^2.0.0"
+          }
+        }
+      }
+    },
     "spdx-correct": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
@@ -1243,6 +2280,39 @@
         "has-flag": "^3.0.0"
       }
     },
+    "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"
+      },
+      "dependencies": {
+        "glob": {
+          "version": "7.1.6",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
+          "integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==",
+          "dev": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
+        }
+      }
+    },
+    "to-fast-properties": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+      "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+      "dev": true
+    },
     "ts-node": {
       "version": "8.5.4",
       "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-8.5.4.tgz",
@@ -1313,6 +2383,12 @@
       "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
       "dev": true
     },
+    "type-fest": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
+      "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
+      "dev": true
+    },
     "type-is": {
       "version": "1.6.18",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
@@ -1322,12 +2398,27 @@
         "mime-types": "~2.1.24"
       }
     },
+    "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"
+      }
+    },
     "typescript": {
       "version": "3.7.2",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.2.tgz",
       "integrity": "sha512-ml7V7JfiN2Xwvcer+XAf2csGO1bPBdRbFCkYBczNZggrBZ9c7G3riSUeJmqEU5uOtXNPMhE3n+R4FA/3YOAWOQ==",
       "dev": true
     },
+    "uuid": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
+      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
+      "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",
@@ -1407,6 +2498,18 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write-file-atomic": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.1.tgz",
+      "integrity": "sha512-JPStrIyyVJ6oCSz/691fAjFtefZ6q+fP6tm+OS4Qw6o+TGQxNp1ziY2PgS+X/m0V8OWhZiO/m4xSj+Pr4RrZvw==",
+      "dev": true,
+      "requires": {
+        "imurmurhash": "^0.1.4",
+        "is-typedarray": "^1.0.0",
+        "signal-exit": "^3.0.2",
+        "typedarray-to-buffer": "^3.1.5"
+      }
+    },
     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
diff --git a/package.json b/package.json
index b26328d1f..036ed7712 100755
--- a/package.json
+++ b/package.json
@@ -50,24 +50,27 @@
   "scripts": {
     "lint": "tslint -p tsconfig.build.json -c tslint.json",
     "lint:all": "tslint -p tsconfig.json -c tslint.json",
-    "build:clean": "npx shx rm -rf ./dist",
-    "build": "npx npm-run-all build:clean build:test:*",
-    "build:test:src": "npx tsc -p tsconfig.json",
+    "build:clean": "shx rm -rf ./dist",
+    "build": "npm-run-all build:clean build:test:*",
+    "build:test:src": "tsc -p tsconfig.json",
     "build:test:package": "node ./scripts/build-prod.js",
-    "build:prod": "npx npm-run-all build:clean build:prod:*",
-    "build:prod:src": "npx tsc -p tsconfig.build.json",
+    "build:prod": "npm-run-all build:clean build:prod:*",
+    "build:prod:src": "tsc -p tsconfig.build.json",
     "build:prod:package": "node ./scripts/build-prod.js",
-    "test": "npx mocha 'test/**/*.spec.ts' --config 'test/.mocharc.jsonc'"
+	"test": "nyc mocha 'test/**/*.spec.ts' --config 'test/.mocharc.jsonc'",
+	"test:clean": "shx rm -rf ./coverage && shx rm -rf ./.nyc_output"
   },
   "repository": {
     "url": "https://github.com/oauthjs/node-oauth2-server.git",
     "type": "git"
   },
   "devDependencies": {
+    "@istanbuljs/nyc-config-typescript": "^1.0.1",
     "@types/mocha": "^5.2.7",
     "@types/sinon": "^7.5.1",
     "mocha": "^6.2.2",
     "npm-run-all": "^4.1.5",
+    "nyc": "^15.0.0",
     "should": "^13.2.3",
     "shx": "^0.3.2",
     "sinon": "^7.5.0",