diff --git a/db.test.ts b/db.test.ts
index 3f3836b..293fc30 100644
--- a/db.test.ts
+++ b/db.test.ts
@@ -1,6 +1,6 @@
 import {enwikidb} from "./db";
-import {sleep} from "mwn/build/utils";
-import * as assert from "assert";
+import {expect} from "chai";
+import * as sinon from 'sinon';
 
 const testDb = new enwikidb({
     host: '127.0.0.1',
@@ -14,18 +14,21 @@ const testDb = new enwikidb({
 it('destroy pooled connections on inactivity', async function () {
     this.timeout(10000);
     let conn1, conn2;
+    let clock = sinon.useFakeTimers();
 
     conn1 = await testDb.getConnection()
     conn1.release();
-    await sleep(1000);
+    clock.tick(1000)
     conn2 = await testDb.getConnection();
-    conn2.release()
-    assert(conn1.threadId === conn2.threadId)
+    conn2.release();
+    expect(conn1.threadId).to.eq(conn2.threadId)
 
     conn1 = await testDb.getConnection()
     conn1.release();
-    await sleep(5100);
+    clock.tick(5100);
     conn2 = await testDb.getConnection();
-    conn2.release()
-    assert(conn1.threadId !== conn2.threadId)
+    conn2.release();
+    expect(conn1.threadId).to.not.eq(conn2.threadId)
+
+    clock.restore();
 });
diff --git a/package-lock.json b/package-lock.json
index 2ce0153..74ce03d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -46,11 +46,14 @@
         "sqlite3": "^5.0.0"
       },
       "devDependencies": {
+        "@types/chai": "^4.3.16",
         "@types/mocha": "^8.0.4",
-        "chai": "^4.2.0",
+        "@types/sinon": "^17.0.3",
+        "chai": "^4.4.1",
         "eslint": "^7.10.0",
         "mocha": "^7.1.1",
         "nodemon": "^2.0.7",
+        "sinon": "^18.0.0",
         "ts-mocha": "^8.0.0",
         "ts-node": "^9.0.0",
         "typescript": "^4.2.4"
@@ -277,6 +280,50 @@
         }
       }
     },
+    "node_modules/@sinonjs/commons": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-3.0.1.tgz",
+      "integrity": "sha512-K3mCHKQ9sVh8o1C9cxkwxaOmXoAMlDxC1mYyHrjqOWEcBjYr76t96zL2zlj5dUGZ3HSw240X1qgH3Mjf1yJWpQ==",
+      "dev": true,
+      "dependencies": {
+        "type-detect": "4.0.8"
+      }
+    },
+    "node_modules/@sinonjs/fake-timers": {
+      "version": "11.2.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-11.2.2.tgz",
+      "integrity": "sha512-G2piCSxQ7oWOxwGSAyFHfPIsyeJGXYtc6mFbnFA+kRXkiEnTl8c/8jul2S329iFBnDI9HGoeWWAZvuvOkZccgw==",
+      "dev": true,
+      "dependencies": {
+        "@sinonjs/commons": "^3.0.0"
+      }
+    },
+    "node_modules/@sinonjs/samsam": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-8.0.0.tgz",
+      "integrity": "sha512-Bp8KUVlLp8ibJZrnvq2foVhP0IVX2CIprMJPK0vqGqgrDa0OHVKeZyBykqskkrdxV6yKBPmGasO8LVjAKR3Gew==",
+      "dev": true,
+      "dependencies": {
+        "@sinonjs/commons": "^2.0.0",
+        "lodash.get": "^4.4.2",
+        "type-detect": "^4.0.8"
+      }
+    },
+    "node_modules/@sinonjs/samsam/node_modules/@sinonjs/commons": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-2.0.0.tgz",
+      "integrity": "sha512-uLa0j859mMrg2slwQYdO/AkrOfmH+X6LTVmNTS9CqexuE2IvVORIkSpJLqePAbEnKJ77aMmCwr1NUZ57120Xcg==",
+      "dev": true,
+      "dependencies": {
+        "type-detect": "4.0.8"
+      }
+    },
+    "node_modules/@sinonjs/text-encoding": {
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/text-encoding/-/text-encoding-0.7.2.tgz",
+      "integrity": "sha512-sXXKG+uL9IrKqViTtao2Ws6dy0znu9sOaP1di/jKGW1M6VssO8vlpXCQcpZ+jisQ1tTFAC5Jo/EOzFbggBagFQ==",
+      "dev": true
+    },
     "node_modules/@tootallnate/once": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
@@ -307,6 +354,12 @@
       "resolved": "https://registry.npmjs.org/@types/caseless/-/caseless-0.12.2.tgz",
       "integrity": "sha512-6ckxMjBBD8URvjB6J3NcnuAn5Pkl7t3TizAg+xdlzzQGSPSmBcXf8KoIH0ua/i+tio+ZRUHEXp0HEmvaR4kt0w=="
     },
+    "node_modules/@types/chai": {
+      "version": "4.3.16",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.3.16.tgz",
+      "integrity": "sha512-PatH4iOdyh3MyWtmHVFXLWCCIhUbopaltqddG9BzB+gMIzee2MJrvd+jouii9Z3wzQJruGWAm7WOMjgfG8hQlQ==",
+      "dev": true
+    },
     "node_modules/@types/connect": {
       "version": "3.4.34",
       "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.34.tgz",
@@ -499,6 +552,21 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/sinon": {
+      "version": "17.0.3",
+      "resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-17.0.3.tgz",
+      "integrity": "sha512-j3uovdn8ewky9kRBG19bOwaZbexJu/XjtkHyjvUgt4xfPFz18dcORIMqnYh66Fx3Powhcr85NT5+er3+oViapw==",
+      "dev": true,
+      "dependencies": {
+        "@types/sinonjs__fake-timers": "*"
+      }
+    },
+    "node_modules/@types/sinonjs__fake-timers": {
+      "version": "8.1.5",
+      "resolved": "https://registry.npmjs.org/@types/sinonjs__fake-timers/-/sinonjs__fake-timers-8.1.5.tgz",
+      "integrity": "sha512-mQkU2jY8jJEF7YHjHvsQO8+3ughTL1mcnn96igfhONmR+fUPSKIkefQYpSe8bsly2Ep7oQbn/6VG5/9/0qcArQ==",
+      "dev": true
+    },
     "node_modules/@types/sizzle": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/@types/sizzle/-/sizzle-2.3.8.tgz",
@@ -1157,17 +1225,18 @@
       }
     },
     "node_modules/chai": {
-      "version": "4.3.4",
-      "resolved": "https://registry.npmjs.org/chai/-/chai-4.3.4.tgz",
-      "integrity": "sha512-yS5H68VYOCtN1cjfwumDSuzn/9c+yza4f3reKXlE5rUg7SFcCEy90gJvydNgOYtblyf4Zi6jIWRnXOgErta0KA==",
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.4.1.tgz",
+      "integrity": "sha512-13sOfMv2+DWduEU+/xbun3LScLoqN17nBeTLUsmDfKdoiC1fr0n9PU4guu4AhRcOVFk/sW8LyZWHuhWtQZiF+g==",
       "dev": true,
       "dependencies": {
         "assertion-error": "^1.1.0",
-        "check-error": "^1.0.2",
-        "deep-eql": "^3.0.1",
-        "get-func-name": "^2.0.0",
+        "check-error": "^1.0.3",
+        "deep-eql": "^4.1.3",
+        "get-func-name": "^2.0.2",
+        "loupe": "^2.3.6",
         "pathval": "^1.1.1",
-        "type-detect": "^4.0.5"
+        "type-detect": "^4.0.8"
       },
       "engines": {
         "node": ">=4"
@@ -1188,10 +1257,13 @@
       }
     },
     "node_modules/check-error": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
-      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.3.tgz",
+      "integrity": "sha512-iKEoDYaRmd1mxM90a2OEfWhjsjPpYPuQ+lMYsoxB126+t8fw7ySEO48nmDg5COTjxDI65/Y2OWpeEHk3ZOe8zg==",
       "dev": true,
+      "dependencies": {
+        "get-func-name": "^2.0.2"
+      },
       "engines": {
         "node": "*"
       }
@@ -1513,15 +1585,15 @@
       "integrity": "sha512-KaL7+6Fw6i5A2XSnsbhm/6B+NuEA7TZ4vqxnd5tXz9sbKtrN9Srj8ab4vKVdK8YAqZO9P1kg45Y6YLoduPf+kw=="
     },
     "node_modules/deep-eql": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-3.0.1.tgz",
-      "integrity": "sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==",
+      "version": "4.1.4",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-4.1.4.tgz",
+      "integrity": "sha512-SUwdGfqdKOwxCPeVYjwSyRpJ7Z+fhpwIAtmCUdZIWZ/YP5R9WAsyuSgpLVDi9bjWoN2LXHNss/dk3urXtdQxGg==",
       "dev": true,
       "dependencies": {
         "type-detect": "^4.0.0"
       },
       "engines": {
-        "node": ">=0.12"
+        "node": ">=6"
       }
     },
     "node_modules/deep-extend": {
@@ -2567,9 +2639,9 @@
       }
     },
     "node_modules/get-func-name": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.0.tgz",
-      "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=",
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.2.tgz",
+      "integrity": "sha512-8vXOvuE167CtIc3OyItco7N/dpRtBbYOsPsXCz7X/PMnlGjYjSGuZJgM1Y7mmew7BKf9BqvLX2tnOVy1BBUsxQ==",
       "dev": true,
       "engines": {
         "node": "*"
@@ -3333,6 +3405,12 @@
         "verror": "1.10.0"
       }
     },
+    "node_modules/just-extend": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/just-extend/-/just-extend-6.2.0.tgz",
+      "integrity": "sha512-cYofQu2Xpom82S6qD778jBDpwvvy39s1l/hrYij2u9AMdQcGRpaBu6kY4mVhuno5kJVi1DAz4aiphA2WI1/OAw==",
+      "dev": true
+    },
     "node_modules/levn": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
@@ -3376,6 +3454,12 @@
       "integrity": "sha1-8xwiIlqWMtK7+OSt2+8kCqdlph8=",
       "dev": true
     },
+    "node_modules/lodash.get": {
+      "version": "4.4.2",
+      "resolved": "https://registry.npmjs.org/lodash.get/-/lodash.get-4.4.2.tgz",
+      "integrity": "sha512-z+Uw/vLuy6gQe8cfaFWD7p0wVv8fJl3mbzXh33RS+0oW2wvUqiRXiQ69gLWSLpgB5/6sU+r6BlQR0MBILadqTQ==",
+      "dev": true
+    },
     "node_modules/lodash.truncate": {
       "version": "4.4.2",
       "resolved": "https://registry.npmjs.org/lodash.truncate/-/lodash.truncate-4.4.2.tgz",
@@ -3399,6 +3483,15 @@
       "resolved": "https://registry.npmjs.org/long/-/long-4.0.0.tgz",
       "integrity": "sha512-XsP+KhQif4bjX1kbuSiySJFNAehNxgLb6hPRGJ9QsUr8ajHkuXGdrHmFUTUUXhDwVX2R5bY4JNZEwbUiMhV+MA=="
     },
+    "node_modules/loupe": {
+      "version": "2.3.7",
+      "resolved": "https://registry.npmjs.org/loupe/-/loupe-2.3.7.tgz",
+      "integrity": "sha512-zSMINGVYkdpYSOBmLi0D1Uo7JU9nVdQKrHxC8eYlV+9YKK9WePqAlL7lSlorG/U2Fw1w0hTBmaa/jrQ3UbPHtA==",
+      "dev": true,
+      "dependencies": {
+        "get-func-name": "^2.0.1"
+      }
+    },
     "node_modules/lru-cache": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
@@ -3951,6 +4044,25 @@
       "resolved": "https://registry.npmjs.org/neo-async/-/neo-async-2.6.2.tgz",
       "integrity": "sha512-Yd3UES5mWCSqR+qNT93S3UoYUkqAZ9lLg8a7g9rimsWmYGK8cVToA4/sF3RrshdyV3sAGMXVUmpMYOw+dLpOuw=="
     },
+    "node_modules/nise": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/nise/-/nise-6.0.0.tgz",
+      "integrity": "sha512-K8ePqo9BFvN31HXwEtTNGzgrPpmvgciDsFz8aztFjt4LqKO/JeFD8tBOeuDiCMXrIl/m1YvfH8auSpxfaD09wg==",
+      "dev": true,
+      "dependencies": {
+        "@sinonjs/commons": "^3.0.0",
+        "@sinonjs/fake-timers": "^11.2.2",
+        "@sinonjs/text-encoding": "^0.7.2",
+        "just-extend": "^6.2.0",
+        "path-to-regexp": "^6.2.1"
+      }
+    },
+    "node_modules/nise/node_modules/path-to-regexp": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-6.2.2.tgz",
+      "integrity": "sha512-GQX3SSMokngb36+whdpRXE+3f9V8UzyAorlYvOGx87ufGHehNTn5lCxrKtLyZ4Yl/wEKnNnr98ZzOwwDZV5ogw==",
+      "dev": true
+    },
     "node_modules/node-addon-api": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-3.1.0.tgz",
@@ -5048,6 +5160,54 @@
         "semver": "bin/semver.js"
       }
     },
+    "node_modules/sinon": {
+      "version": "18.0.0",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-18.0.0.tgz",
+      "integrity": "sha512-+dXDXzD1sBO6HlmZDd7mXZCR/y5ECiEiGCBSGuFD/kZ0bDTofPYc6JaeGmPSF+1j1MejGUWkORbYOLDyvqCWpA==",
+      "dev": true,
+      "dependencies": {
+        "@sinonjs/commons": "^3.0.1",
+        "@sinonjs/fake-timers": "^11.2.2",
+        "@sinonjs/samsam": "^8.0.0",
+        "diff": "^5.2.0",
+        "nise": "^6.0.0",
+        "supports-color": "^7"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/sinon"
+      }
+    },
+    "node_modules/sinon/node_modules/diff": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-5.2.0.tgz",
+      "integrity": "sha512-uIFDxqpRZGZ6ThOk84hEfqWoHx2devRFvpTZcTHur85vImfaxUbTW9Ryh4CpCuDnToOP1CEtXKIgytHBPVff5A==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.3.1"
+      }
+    },
+    "node_modules/sinon/node_modules/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,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/sinon/node_modules/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,
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/slice-ansi": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-4.0.0.tgz",
@@ -6338,6 +6498,52 @@
         }
       }
     },
+    "@sinonjs/commons": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-3.0.1.tgz",
+      "integrity": "sha512-K3mCHKQ9sVh8o1C9cxkwxaOmXoAMlDxC1mYyHrjqOWEcBjYr76t96zL2zlj5dUGZ3HSw240X1qgH3Mjf1yJWpQ==",
+      "dev": true,
+      "requires": {
+        "type-detect": "4.0.8"
+      }
+    },
+    "@sinonjs/fake-timers": {
+      "version": "11.2.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-11.2.2.tgz",
+      "integrity": "sha512-G2piCSxQ7oWOxwGSAyFHfPIsyeJGXYtc6mFbnFA+kRXkiEnTl8c/8jul2S329iFBnDI9HGoeWWAZvuvOkZccgw==",
+      "dev": true,
+      "requires": {
+        "@sinonjs/commons": "^3.0.0"
+      }
+    },
+    "@sinonjs/samsam": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-8.0.0.tgz",
+      "integrity": "sha512-Bp8KUVlLp8ibJZrnvq2foVhP0IVX2CIprMJPK0vqGqgrDa0OHVKeZyBykqskkrdxV6yKBPmGasO8LVjAKR3Gew==",
+      "dev": true,
+      "requires": {
+        "@sinonjs/commons": "^2.0.0",
+        "lodash.get": "^4.4.2",
+        "type-detect": "^4.0.8"
+      },
+      "dependencies": {
+        "@sinonjs/commons": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-2.0.0.tgz",
+          "integrity": "sha512-uLa0j859mMrg2slwQYdO/AkrOfmH+X6LTVmNTS9CqexuE2IvVORIkSpJLqePAbEnKJ77aMmCwr1NUZ57120Xcg==",
+          "dev": true,
+          "requires": {
+            "type-detect": "4.0.8"
+          }
+        }
+      }
+    },
+    "@sinonjs/text-encoding": {
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/text-encoding/-/text-encoding-0.7.2.tgz",
+      "integrity": "sha512-sXXKG+uL9IrKqViTtao2Ws6dy0znu9sOaP1di/jKGW1M6VssO8vlpXCQcpZ+jisQ1tTFAC5Jo/EOzFbggBagFQ==",
+      "dev": true
+    },
     "@tootallnate/once": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
@@ -6365,6 +6571,12 @@
       "resolved": "https://registry.npmjs.org/@types/caseless/-/caseless-0.12.2.tgz",
       "integrity": "sha512-6ckxMjBBD8URvjB6J3NcnuAn5Pkl7t3TizAg+xdlzzQGSPSmBcXf8KoIH0ua/i+tio+ZRUHEXp0HEmvaR4kt0w=="
     },
+    "@types/chai": {
+      "version": "4.3.16",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.3.16.tgz",
+      "integrity": "sha512-PatH4iOdyh3MyWtmHVFXLWCCIhUbopaltqddG9BzB+gMIzee2MJrvd+jouii9Z3wzQJruGWAm7WOMjgfG8hQlQ==",
+      "dev": true
+    },
     "@types/connect": {
       "version": "3.4.34",
       "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.34.tgz",
@@ -6556,6 +6768,21 @@
         "@types/node": "*"
       }
     },
+    "@types/sinon": {
+      "version": "17.0.3",
+      "resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-17.0.3.tgz",
+      "integrity": "sha512-j3uovdn8ewky9kRBG19bOwaZbexJu/XjtkHyjvUgt4xfPFz18dcORIMqnYh66Fx3Powhcr85NT5+er3+oViapw==",
+      "dev": true,
+      "requires": {
+        "@types/sinonjs__fake-timers": "*"
+      }
+    },
+    "@types/sinonjs__fake-timers": {
+      "version": "8.1.5",
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@@ -8730,6 +8961,12 @@
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@@ -8767,6 +9004,12 @@
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+      "resolved": "https://registry.npmjs.org/lodash.get/-/lodash.get-4.4.2.tgz",
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+      "resolved": "https://registry.npmjs.org/loupe/-/loupe-2.3.7.tgz",
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+      "requires": {
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+      "resolved": "https://registry.npmjs.org/nise/-/nise-6.0.0.tgz",
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+      "dev": true,
+      "requires": {
+        "@sinonjs/commons": "^3.0.0",
+        "@sinonjs/fake-timers": "^11.2.2",
+        "@sinonjs/text-encoding": "^0.7.2",
+        "just-extend": "^6.2.0",
+        "path-to-regexp": "^6.2.1"
+      },
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+        }
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@@ -10074,6 +10347,43 @@
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+    "sinon": {
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+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-18.0.0.tgz",
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+      "dev": true,
+      "requires": {
+        "@sinonjs/commons": "^3.0.1",
+        "@sinonjs/fake-timers": "^11.2.2",
+        "@sinonjs/samsam": "^8.0.0",
+        "diff": "^5.2.0",
+        "nise": "^6.0.0",
+        "supports-color": "^7"
+      },
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+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
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+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
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diff --git a/package.json b/package.json
index 2ff5d2d..c16373e 100644
--- a/package.json
+++ b/package.json
@@ -51,11 +51,14 @@
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     "@types/mocha": "^8.0.4",
-    "chai": "^4.2.0",
+    "@types/sinon": "^17.0.3",
+    "chai": "^4.4.1",
     "eslint": "^7.10.0",
     "mocha": "^7.1.1",
     "nodemon": "^2.0.7",
+    "sinon": "^18.0.0",
     "ts-mocha": "^8.0.0",
     "ts-node": "^9.0.0",
     "typescript": "^4.2.4"