Revise rank calculation

tests/calculateRank.test.js

@@ -2,17 +2,45 @@ require("@testing-library/jest-dom");
 const calculateRank = require("../src/calculateRank");
 
 describe("Test calculateRank", () => {
-  it("should calculate rank correctly", () => {
+  it("new user gets B rank", () => {
     expect(
       calculateRank({
-        totalCommits: 100,
-        totalRepos: 5,
-        followers: 100,
-        contributions: 61,
-        stargazers: 400,
-        prs: 300,
-        issues: 200,
+        totalRepos: 0,
+        totalCommits: 0,
+        contributions: 0,
+        followers: 0,
+        prs: 0,
+        issues: 0,
+        stargazers: 0,
       }),
-    ).toStrictEqual({ level: "A+", score: 49.16605417270399 });
+    ).toStrictEqual({level: "B", score: 100.});
+  });
+
+  it("average user gets A rank", () => {
+    expect(
+      calculateRank({
+        totalRepos: 10,
+        totalCommits: 1000,
+        contributions: 1000,
+        followers: 50,
+        prs: 25,
+        issues: 25,
+        stargazers: 100,
+      }),
+    ).toStrictEqual({"A", score: 36.787944117144235});
+  });
+
+  it("Linus Torvalds gets S rank", () => {
+    expect(
+      calculateRank({
+        totalRepos: 4, // few repos
+        totalCommits: 20000,
+        contributions: 20000,
+        followers: 132000,
+        prs: 71,
+        issues: 2,
+        stargazers: 109100,
+      }),
+    ).toStrictEqual({ level: "S", score: 7.092453734726941});
   });
 });