feat(test): add k6 test to number-fact

tests/perf-analysis/test.js

@@ -0,0 +1,86 @@
+// k6 run ./test.js
+
+import http from 'k6/http';
+import { check, sleep } from 'k6';
+import { Trend } from 'k6/metrics';
+
+const API_URL = 'http://localhost:8080/factors';
+
+const easyResponseTimes = new Trend('easy_response_times', true);
+const mediumResponseTimes = new Trend('medium_response_times', true);
+const hardResponseTimes = new Trend('hard_response_times', true);
+
+export const options = {
+  scenarios: {
+    easyNumbers: {
+      executor: 'constant-vus',
+      vus: 8,
+      duration: '30s',
+      exec: 'easyNumbers',
+    },
+    mediumNumbers: {
+      executor: 'constant-vus',
+      vus: 8,
+      duration: '30s',
+      exec: 'mediumNumbers',
+      startTime: '30s',
+    },
+    hardNumbers: {
+      executor: 'constant-vus',
+      vus: 8,
+      duration: '30s',
+      exec: 'hardNumbers',
+      startTime: '60s',
+    },
+  },
+};
+
+export function easyNumbers() {
+  const numbers = [
+    '12345', '67890', '111213', '141516', '171819', 
+    '202122', '232425', '262728', '293031', '323334'
+  ];
+  testAPI(numbers, 'easy');
+}
+
+export function mediumNumbers() {
+  const numbers = [
+    '12345678901234567890', '98765432109876543210', '11223344556677889900',
+    '99887766554433221100', '10203040506070809000', '50607080901020304050',
+    '21436587092143658709', '13579246801357924680', '98765412309876541230',
+    '19283746501928374650'
+  ];
+  testAPI(numbers, 'medium');
+}
+
+export function hardNumbers() {
+  const numbers = [
+    '123456789012345677777', '987654321098765432777', '112233445566778899075',
+    '998877665544332211057', '102030405060708090057', '506070809010203040575',
+    '214365870921436587577', '135792468013579246875', '9876541230987654123775',
+    '19283746501928374655705'
+  ];
+  testAPI(numbers, 'hard');
+}
+
+function testAPI(numbers, tag) {
+  const trends = {
+    easy: easyResponseTimes,
+    medium: mediumResponseTimes,
+    hard: hardResponseTimes,
+  };
+
+  for (const number of numbers) {
+    const res = http.get(`${API_URL}?number=${number}`, {
+      tags: { scenario: tag },
+    });
+
+    check(res, {
+      'status is 200': (r) => r.status === 200,
+    });
+
+    trends[tag].add(res.timings.duration);
+
+    sleep(1); 
+  }
+}