diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index b4aaabdc..f8abcadf 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
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@@ -1110,6 +1111,15 @@
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@@ -1733,6 +1749,18 @@
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@@ -2279,6 +2313,18 @@
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@@ -2437,6 +2483,18 @@
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+      "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-4.0.0.tgz",
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@@ -2557,6 +2635,15 @@
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+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
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@@ -2619,6 +2706,18 @@
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@@ -3803,6 +3902,20 @@
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+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.0.tgz",
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@@ -4148,6 +4261,18 @@
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+      "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-3.0.0.tgz",
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@@ -4173,6 +4298,45 @@
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+      "dev": true,
+      "dependencies": {
+        "@tootallnate/once": "2",
+        "agent-base": "6",
+        "debug": "4"
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+      "engines": {
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+    "node_modules/https-proxy-agent": {
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+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-5.0.1.tgz",
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+      "dev": true,
+      "dependencies": {
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+        "debug": "4"
+      },
+      "engines": {
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+    "node_modules/iconv-lite": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
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@@ -4460,6 +4624,12 @@
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@@ -4714,6 +4884,48 @@
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+        "cssstyle": "^3.0.0",
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+        "http-proxy-agent": "^5.0.0",
+        "https-proxy-agent": "^5.0.1",
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+        "saxes": "^6.0.0",
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@@ -4965,6 +5177,27 @@
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+      "dev": true,
+      "engines": {
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+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
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+      "dependencies": {
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@@ -5092,6 +5325,12 @@
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+      "resolved": "https://registry.npmjs.org/nwsapi/-/nwsapi-2.2.5.tgz",
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@@ -5624,6 +5863,12 @@
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@@ -5643,6 +5888,12 @@
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@@ -5799,6 +6050,12 @@
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@@ -5867,6 +6124,12 @@
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@@ -5904,6 +6167,24 @@
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+      "resolved": "https://registry.npmjs.org/saxes/-/saxes-6.0.0.tgz",
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@@ -6232,6 +6513,12 @@
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@@ -6388,6 +6675,42 @@
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+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.1.3.tgz",
+      "integrity": "sha512-aX/y5pVRkfRnfmuX+OdbSdXvPe6ieKX/G2s7e98f4poJHnqH3281gDPm/metm6E/WRamfx7WC4HUqkWHfQHprw==",
+      "dev": true,
+      "dependencies": {
+        "psl": "^1.1.33",
+        "punycode": "^2.1.1",
+        "universalify": "^0.2.0",
+        "url-parse": "^1.5.3"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/tough-cookie/node_modules/universalify": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.2.0.tgz",
+      "integrity": "sha512-CJ1QgKmNg3CwvAv/kOFmtnEN05f0D/cn9QntgNOQlQF9dgvVTHj3t+8JPdjqawCHk7V/KA+fbUqzZ9XWhcqPUg==",
+      "dev": true,
+      "engines": {
+        "node": ">= 4.0.0"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-4.1.1.tgz",
+      "integrity": "sha512-2lv/66T7e5yNyhAAC4NaKe5nVavzuGJQVVtRYLyQ2OI8tsJ61PMLlelehb0wi2Hx6+hT/OJUWZcw8MjlSRnxvw==",
+      "dev": true,
+      "dependencies": {
+        "punycode": "^2.3.0"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/ts-interface-checker": {
       "version": "0.1.13",
       "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
@@ -6579,6 +6902,16 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/url-parse": {
+      "version": "1.5.10",
+      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.5.10.tgz",
+      "integrity": "sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==",
+      "dev": true,
+      "dependencies": {
+        "querystringify": "^2.1.1",
+        "requires-port": "^1.0.0"
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -6951,6 +7284,27 @@
         }
       }
     },
+    "node_modules/w3c-xmlserializer": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-4.0.0.tgz",
+      "integrity": "sha512-d+BFHzbiCx6zGfz0HyQ6Rg69w9k19nviJspaj4yNscGjrHu94sVP+aRm75yEbCh+r2/yR+7q6hux9LVtbuTGBw==",
+      "dev": true,
+      "dependencies": {
+        "xml-name-validator": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
+      "integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/well-known-symbols": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/well-known-symbols/-/well-known-symbols-2.0.0.tgz",
@@ -6960,6 +7314,40 @@
         "node": ">=6"
       }
     },
+    "node_modules/whatwg-encoding": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-2.0.0.tgz",
+      "integrity": "sha512-p41ogyeMUrw3jWclHWTQg1k05DSVXPLcVxRTYsXUk+ZooOCZLcoYgPZ/HL/D/N+uQPOtcp1me1WhBEaX02mhWg==",
+      "dev": true,
+      "dependencies": {
+        "iconv-lite": "0.6.3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-3.0.0.tgz",
+      "integrity": "sha512-nt+N2dzIutVRxARx1nghPKGv1xHikU7HKdfafKkLNLindmPU/ch3U31NOCGGA/dmPcmb1VlofO0vnKAcsm0o/Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "12.0.1",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-12.0.1.tgz",
+      "integrity": "sha512-Ed/LrqB8EPlGxjS+TrsXcpUond1mhccS3pchLhzSgPCnTimUCKj3IZE75pAs5m6heB2U2TMerKFUXheyHY+VDQ==",
+      "dev": true,
+      "dependencies": {
+        "tr46": "^4.1.1",
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -7107,6 +7495,42 @@
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
       "dev": true
     },
+    "node_modules/ws": {
+      "version": "8.13.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.13.0.tgz",
+      "integrity": "sha512-x9vcZYTrFPC7aSIbj7sRCYo7L/Xb8Iy+pW0ng0wt2vCJv7M9HOMy0UoN3rr+IFC7hb7vXoqS+P9ktyLLLhO+LA==",
+      "dev": true,
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-4.0.0.tgz",
+      "integrity": "sha512-ICP2e+jsHvAj2E2lIHxa5tjXRlKDJo4IdvPvCXbXQGdzSfmSpNVyIKMvoZHjDY9DP0zV17iI85o90vRFXNccRw==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true
+    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
diff --git a/package.json b/package.json
index 99aec4f2..14d24cfa 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
     "eslint-plugin-promise": "^6.1.1",
     "eslint-plugin-react": "^7.32.2",
     "eslint-plugin-react-hooks": "^4.6.0",
+    "jsdom": "^22.1.0",
     "postcss": "^8.4.22",
     "tailwindcss": "^3.3.1",
     "typescript": "^4.6.3",
diff --git a/src/utils/getUserPRVelocity.ts b/src/utils/getUserPRVelocity.ts
index 59f73828..5931d2e2 100644
--- a/src/utils/getUserPRVelocity.ts
+++ b/src/utils/getUserPRVelocity.ts
@@ -1,16 +1,22 @@
 import { differenceInDays } from "date-fns";
 import { IUserPR } from "../ts/types";
 
-export const getUserPRVelocity = ((prDetails: IUserPR[]) => {
-    const mergedPRs = prDetails.filter((prState: IUserPR) => prState.state.toLowerCase() === "merged");
+export const getUserPRVelocity = (prDetails: IUserPR[]) => {
+    const mergedPRs = prDetails.filter(
+        (prState: IUserPR) => prState.state.toLowerCase() === "merged",
+    );
 
     const totalDays = mergedPRs.reduce((total: number, pr: IUserPR) => {
-        const daysBetween = differenceInDays(new Date(pr.closed_at), new Date(pr.created_at));
+        const daysBetween = differenceInDays(
+            new Date(pr.closed_at),
+            new Date(pr.created_at),
+        );
 
         return (total += daysBetween);
     }, 0);
 
-    const averageVelocity: number = mergedPRs.length > 0 ? Math.round(totalDays / mergedPRs.length) : 0;
+    const averageVelocity: number =
+    mergedPRs.length > 0 ? Math.floor(totalDays / mergedPRs.length) : 0;
 
     return averageVelocity;
-});
+};
diff --git a/test/utils/colorPreference.test.ts b/test/utils/colorPreference.test.ts
new file mode 100644
index 00000000..4f58c5c0
--- /dev/null
+++ b/test/utils/colorPreference.test.ts
@@ -0,0 +1,41 @@
+import { describe, it, expect, vi } from "vitest";
+import { prefersDarkMode } from "../../src/utils/colorPreference";
+
+Object.defineProperty(window, "matchMedia", {
+  writable: true,
+  value: vi.fn().mockImplementation((query) => ({
+    matches: query === "(prefers-color-scheme: dark)",
+    media: query,
+    onchange: null,
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+    dispatchEvent: vi.fn(),
+  })),
+});
+
+describe("checkColorPreference", () => {
+  it('should return true when the color_mode is set to "dark"', () => {
+    const cookieString =
+      "tz=Asia%2FCalcutta; color_mode=%7B%22color_mode%22%3A%22dark%22%7D";
+    const expected = true;
+    const actual = prefersDarkMode(cookieString);
+    expect(actual).toEqual(expected);
+  });
+
+  it('should return false when the color_mode is set to "light"', () => {
+    const cookieString = "color_mode=%7B%22color_mode%22%3A%22light%22%7D";
+
+    const expected = false;
+    const actual = prefersDarkMode(cookieString);
+    expect(actual).toEqual(expected);
+  });
+
+  it('should return true when the color_mode is set to "auto` and prefers-color-scheme is "dark"', () => {
+    const cookieString =
+      "color_mode=%7B%22color_mode%22%3A%22auto%22%7D;tz=Asia%2FCalcutta";
+
+    const expected = true;
+    const actual = prefersDarkMode(cookieString);
+    expect(actual).toEqual(expected);
+  });
+});
diff --git a/test/utils/getUserPRVelocity.test.ts b/test/utils/getUserPRVelocity.test.ts
new file mode 100644
index 00000000..db52bfb0
--- /dev/null
+++ b/test/utils/getUserPRVelocity.test.ts
@@ -0,0 +1,30 @@
+import { describe, it, expect } from "vitest";
+import { getUserPRVelocity } from "../../src/utils/getUserPRVelocity";
+import { IUserPR } from "../../src/ts/types";
+
+describe("getUserPRVelocity", () => {
+  it("should consider all PRs to calculate PRVelocity", () => {
+    const prDetails = [
+      { state: "merged", created_at: "2022-12-24", closed_at: "2023-01-15" },
+      { state: "merged", created_at: "2023-02-18", closed_at: "2023-02-19" },
+      { state: "merged", created_at: "2023-02-20", closed_at: "2023-03-1" },
+    ] as IUserPR[];
+    const averageVelocity = getUserPRVelocity(prDetails);
+    expect(averageVelocity).toBe(10);
+  });
+
+  it("should only consider closed PRs with a closed_at field", () => {
+    const prDetails = [
+      { state: "open", created_at: "2023-06-01", closed_at: "2023-06-03" },
+      { state: "open", created_at: "2023-06-05", closed_at: "" },
+    ] as IUserPR[];
+    const averageVelocity = getUserPRVelocity(prDetails);
+    expect(averageVelocity).toBe(0);
+  });
+
+  it("should return 0 if there are no enteries ", () => {
+    const prDetails = [];
+    const averageVelocity = getUserPRVelocity(prDetails);
+    expect(averageVelocity).toBe(0);
+  });
+});
diff --git a/vite.config.ts b/vite.config.ts
index 9b1adf7a..431c2dd8 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,9 +1,11 @@
-import { defineConfig } from "vite";
+import { defineConfig } from "vitest/config";
 import react from "@vitejs/plugin-react";
 import { crx } from "@crxjs/vite-plugin";
 import manifest from "./manifest.json" assert { type: "json" };
 
 // https://vitejs.dev/config/
 export default defineConfig({
-  plugins: [react(), crx({ manifest })]
+  test: {
+    environment: "jsdom",
+  },
 });