feat: split Install/UnitTest stages, add game.js tests with 100% coverage

21 tests covering win/loss/draw/score/reset. lcov report fed to SonarQube.
Pipeline: Install → Unit Test → Scan Code Quality → Build & Push.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jenkinsfile

@@ -3,12 +3,26 @@
 import vn.fireflylab.pipeline.BranchStrategy
 
 // ── Stage functions ────────────────────────────────────────────────
-def executeInstallTest() {
+def executeInstall() {
-    stage('Install & Test') {
+    stage('Install') {
+        container('node') { runNodeInstall() }
+    }
+}
+
+def executeUnitTest() {
+    stage('Unit Test') {
         container('node') { runNodeTest() }
     }
 }
 
+def executeScanCodeQuality() {
+    stage('Scan Code Quality') {
+        container('sonar') {
+            scanCodeQuality(projectKey: 'tictactoe')
+        }
+    }
+}
+
 def executeBuildPush() {
     stage('Build & Push') {
         container('docker') {
@@ -19,14 +33,6 @@ def executeBuildPush() {
     }
 }
 
-def executeScanCodeQuality() {
-    stage('Scan Code Quality') {
-        container('sonar') {
-            scanCodeQuality(projectKey: 'tictactoe')
-        }
-    }
-}
-
 def executeBumpChart() {
     stage('Bump Helm Chart') {
         container('tools') {
@@ -40,41 +46,54 @@ def executeBumpChart() {
 }
 
 // ── Pipeline ───────────────────────────────────────────────────────
+// PR-*          → install + test
+// feature/*     → install + test + scan + build + push
+// develop       → install + test + scan + build + push
+// main          → install + test + scan + build + push
+// release/x.y.z → install + test + scan + build + push
+// hotfix/*      → install + test + scan + build + push
+
 podTemplate(yaml: homelabK8sAgent(withTools: true, withSonar: true)) {
     node(POD_LABEL) {
         withEnv(['DOCKER_HOST=tcp://localhost:2375']) {
             checkout scm
 
             BranchStrategy.prStrategy(env.BRANCH_NAME) {
-                executeInstallTest()
+                executeInstall()
+                executeUnitTest()
             }
 
             BranchStrategy.featureStrategy(env.BRANCH_NAME) {
-                executeInstallTest()
+                executeInstall()
+                executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()
             }
 
             BranchStrategy.developStrategy(env.BRANCH_NAME) {
-                executeInstallTest()
+                executeInstall()
+                executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()
             }
 
             BranchStrategy.mainStrategy(env.BRANCH_NAME) {
-                executeInstallTest()
+                executeInstall()
+                executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()
             }
 
             BranchStrategy.releaseStrategy(env.BRANCH_NAME) {
-                executeInstallTest()
+                executeInstall()
+                executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()
             }
 
             BranchStrategy.hotfixStrategy(env.BRANCH_NAME) {
-                executeInstallTest()
+                executeInstall()
+                executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()
             }

package-lock.json

@@ -12,6 +12,7 @@
       },
       "devDependencies": {
         "jest": "^29.5.0",
+        "jest-environment-jsdom": "^29.5.0",
         "supertest": "^6.3.3"
       }
     },
@@ -980,6 +981,16 @@
         "@sinonjs/commons": "^3.0.0"
       }
     },
+    "node_modules/@tootallnate/once": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-2.0.0.tgz",
+      "integrity": "sha512-XCuKFP5PS55gnMVu3dty8KPatLqUoy/ZYzDzAGCQ8JNFCkLXzmI7vNHCR+XpbZaMWQK/vQubr7PkYq8g470J/A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 10"
+      }
+    },
     "node_modules/@types/babel__core": {
       "version": "7.20.5",
       "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.20.5.tgz",
@@ -1062,6 +1073,18 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "node_modules/@types/jsdom": {
+      "version": "20.0.1",
+      "resolved": "https://registry.npmjs.org/@types/jsdom/-/jsdom-20.0.1.tgz",
+      "integrity": "sha512-d0r18sZPmMQr1eG35u12FZfhIXNrnsPU/g5wvRKCUf/tOGilKKwYMYGqh33BNR6ba+2gkHw1EUiHoN3mn7E5IQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*",
+        "@types/tough-cookie": "*",
+        "parse5": "^7.0.0"
+      }
+    },
     "node_modules/@types/node": {
       "version": "25.6.0",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-25.6.0.tgz",
@@ -1079,6 +1102,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/tough-cookie": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/@types/tough-cookie/-/tough-cookie-4.0.5.tgz",
+      "integrity": "sha512-/Ad8+nIOV7Rl++6f1BdKxFSMgmoqEoYbHRpPcx3JEfv8VRsQe9Z4mCXeJBzxs7mbHY/XOZZuXlRNfhpVPbs6ZA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/yargs": {
       "version": "17.0.35",
       "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.35.tgz",
@@ -1096,6 +1126,14 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/abab": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.6.tgz",
+      "integrity": "sha512-j2afSsaIENvHZN2B8GOpF566vZ5WVk5opAiMTvWgaQT8DkbOqsTfvNAvHoRGU2zzP8cPoqys+xHTRDWW8L+/BA==",
+      "deprecated": "Use your platform's native atob() and btoa() methods instead",
+      "dev": true,
+      "license": "BSD-3-Clause"
+    },
     "node_modules/accepts": {
       "version": "1.3.8",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
@@ -1109,6 +1147,81 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/acorn": {
+      "version": "8.16.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.16.0.tgz",
+      "integrity": "sha512-UVJyE9MttOsBQIDKw1skb9nAwQuR5wuGD3+82K6JgJlm/Y+KI92oNsMNGZCYdDsVtRHSak0pcV5Dno5+4jh9sw==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/acorn-globals": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-7.0.1.tgz",
+      "integrity": "sha512-umOSDSDrfHbTNPuNpC2NSnnA3LUrqpevPb4T9jRx4MagXNS0rs+gwiTcAvqCRmsD6utzsrzNt+ebm00SNWiC3Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "acorn": "^8.1.0",
+        "acorn-walk": "^8.0.2"
+      }
+    },
+    "node_modules/acorn-walk": {
+      "version": "8.3.5",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-8.3.5.tgz",
+      "integrity": "sha512-HEHNfbars9v4pgpW6SO1KSPkfoS0xVOM/9UzkJltjlsHZmJasxg8aXkuZa7SMf8vKGIBhpUsPluQSqhJFCqebw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "acorn": "^8.11.0"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/agent-base": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
+      "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6.0.0"
+      }
+    },
+    "node_modules/agent-base/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/agent-base/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/ansi-escapes": {
       "version": "4.3.2",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.2.tgz",
@@ -1729,6 +1842,48 @@
         "node": ">= 8"
       }
     },
+    "node_modules/cssom": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.5.0.tgz",
+      "integrity": "sha512-iKuQcq+NdHqlAcwUY0o/HL69XQrUaQdMjmStJ8JFmUaiiQErlhrmuigkg/CU4E2J0IyUKUrMAgl36TvN67MqTw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/cssstyle": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-2.3.0.tgz",
+      "integrity": "sha512-AZL67abkUzIuvcHqk7c09cezpGNcxUxU4Ioi/05xHk4DQeTkWmGYftIE6ctU6AEt+Gn4n1lDStOtj7FKycP71A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cssom": "~0.3.6"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cssstyle/node_modules/cssom": {
+      "version": "0.3.8",
+      "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
+      "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/data-urls": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-3.0.2.tgz",
+      "integrity": "sha512-Jy/tj3ldjZJo63sVAvg6LHt2mHvl4V6AgRAmNDtLdm7faqtsx+aJG42rsyCo9JCoRVKwPFzKlIPx3DIibwSIaQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "abab": "^2.0.6",
+        "whatwg-mimetype": "^3.0.0",
+        "whatwg-url": "^11.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/debug": {
       "version": "2.6.9",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -1738,6 +1893,13 @@
         "ms": "2.0.0"
       }
     },
+    "node_modules/decimal.js": {
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.6.0.tgz",
+      "integrity": "sha512-YpgQiITW3JXGntzdUmyUR1V812Hn8T1YVXhCu+wO3OpS4eU9l4YdD3qjyiKdV6mvV29zapkMeD390UVEf2lkUg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/dedent": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/dedent/-/dedent-1.7.2.tgz",
@@ -1823,6 +1985,20 @@
         "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
       }
     },
+    "node_modules/domexception": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/domexception/-/domexception-4.0.0.tgz",
+      "integrity": "sha512-A2is4PLG+eeSfoTMA95/s4pvAoSo2mKtiM5jlHkAVewmiO8ISFTFKZjH7UAM1Atli/OT/7JHOrJRJiMKUZKYBw==",
+      "deprecated": "Use your platform's native DOMException instead",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/dunder-proto": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
@@ -1879,6 +2055,19 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/entities": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.1.tgz",
+      "integrity": "sha512-aN97NXWF6AWBTahfVOIrB/NShkzi5H7F9r1s9mD3cDj4Ko5f2qhhVoYMibXF7GlLveb/D2ioWay8lxI97Ven3g==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
     "node_modules/error-ex": {
       "version": "1.3.4",
       "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.4.tgz",
@@ -1961,6 +2150,28 @@
         "node": ">=8"
       }
     },
+    "node_modules/escodegen": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-2.1.0.tgz",
+      "integrity": "sha512-2NlIDTwUWJN0mRPQOdtQBzbUHvdGY2P1VXSyU83Q3xKxM7WHX2Ql8dKq782Q9TgQUNOLEzEYu9bzLNj1q88I5w==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "esprima": "^4.0.1",
+        "estraverse": "^5.2.0",
+        "esutils": "^2.0.2"
+      },
+      "bin": {
+        "escodegen": "bin/escodegen.js",
+        "esgenerate": "bin/esgenerate.js"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "optionalDependencies": {
+        "source-map": "~0.6.1"
+      }
+    },
     "node_modules/esprima": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
@@ -1975,6 +2186,26 @@
         "node": ">=4"
       }
     },
+    "node_modules/estraverse": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.3.0.tgz",
+      "integrity": "sha512-MMdARuVEQziNTeJD8DgMqmhwR11BRQ/cBP+pLtYdSTnf3MIO8fFeiINEbX36ZdNlfU/7A9f3gUw49B3oQsvwBA==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=4.0"
+      }
+    },
+    "node_modules/esutils": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.3.tgz",
+      "integrity": "sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/etag": {
       "version": "1.8.1",
       "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
@@ -2402,6 +2633,19 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/html-encoding-sniffer": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-3.0.0.tgz",
+      "integrity": "sha512-oWv4T4yJ52iKrufjnyZPkrN0CH3QnrUqdB6In1g5Fe1mia8GmF36gnfNySxoZtxD5+NmYw1EElVXiBk93UeskA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "whatwg-encoding": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/html-escaper": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/html-escaper/-/html-escaper-2.0.2.tgz",
@@ -2429,6 +2673,85 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/http-proxy-agent": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/http-proxy-agent/-/http-proxy-agent-5.0.0.tgz",
+      "integrity": "sha512-n2hY8YdoRE1i7r6M0w9DIw5GgZN0G25P8zLCRQ8rjXtTU3vsNFBI/vWK/UIeE6g5MUUz6avwAPXmL6Fy9D/90w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@tootallnate/once": "2",
+        "agent-base": "6",
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/http-proxy-agent/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/http-proxy-agent/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/https-proxy-agent": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-5.0.1.tgz",
+      "integrity": "sha512-dFcAjpTQFgoLMzC2VwU+C/CbS7uRL0lWmxDITmqm7C+7F0Odmj6s9l6alZc6AELXhrnggM2CeWSXHGOdX2YtwA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "agent-base": "6",
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/https-proxy-agent/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/https-proxy-agent/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/human-signals": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/human-signals/-/human-signals-2.1.0.tgz",
@@ -2561,6 +2884,13 @@
         "node": ">=0.12.0"
       }
     },
+    "node_modules/is-potential-custom-element-name": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/is-potential-custom-element-name/-/is-potential-custom-element-name-1.0.1.tgz",
+      "integrity": "sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/is-stream": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-2.0.1.tgz",
@@ -2890,6 +3220,34 @@
         "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
       }
     },
+    "node_modules/jest-environment-jsdom": {
+      "version": "29.7.0",
+      "resolved": "https://registry.npmjs.org/jest-environment-jsdom/-/jest-environment-jsdom-29.7.0.tgz",
+      "integrity": "sha512-k9iQbsf9OyOfdzWH8HDmrRT0gSIcX+FLNW7IQq94tFX0gynPwqDTW0Ho6iMVNjGz/nb+l/vW3dWM2bbLLpkbXA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jest/environment": "^29.7.0",
+        "@jest/fake-timers": "^29.7.0",
+        "@jest/types": "^29.6.3",
+        "@types/jsdom": "^20.0.0",
+        "@types/node": "*",
+        "jest-mock": "^29.7.0",
+        "jest-util": "^29.7.0",
+        "jsdom": "^20.0.0"
+      },
+      "engines": {
+        "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
+      },
+      "peerDependencies": {
+        "canvas": "^2.5.0"
+      },
+      "peerDependenciesMeta": {
+        "canvas": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/jest-environment-node": {
       "version": "29.7.0",
       "resolved": "https://registry.npmjs.org/jest-environment-node/-/jest-environment-node-29.7.0.tgz",
@@ -3307,6 +3665,52 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
+    "node_modules/jsdom": {
+      "version": "20.0.3",
+      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-20.0.3.tgz",
+      "integrity": "sha512-SYhBvTh89tTfCD/CRdSOm13mOBa42iTaTyfyEWBdKcGdPxPtLFBXuHR8XHb33YNYaP+lLbmSvBTsnoesCNJEsQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "abab": "^2.0.6",
+        "acorn": "^8.8.1",
+        "acorn-globals": "^7.0.0",
+        "cssom": "^0.5.0",
+        "cssstyle": "^2.3.0",
+        "data-urls": "^3.0.2",
+        "decimal.js": "^10.4.2",
+        "domexception": "^4.0.0",
+        "escodegen": "^2.0.0",
+        "form-data": "^4.0.0",
+        "html-encoding-sniffer": "^3.0.0",
+        "http-proxy-agent": "^5.0.0",
+        "https-proxy-agent": "^5.0.1",
+        "is-potential-custom-element-name": "^1.0.1",
+        "nwsapi": "^2.2.2",
+        "parse5": "^7.1.1",
+        "saxes": "^6.0.0",
+        "symbol-tree": "^3.2.4",
+        "tough-cookie": "^4.1.2",
+        "w3c-xmlserializer": "^4.0.0",
+        "webidl-conversions": "^7.0.0",
+        "whatwg-encoding": "^2.0.0",
+        "whatwg-mimetype": "^3.0.0",
+        "whatwg-url": "^11.0.0",
+        "ws": "^8.11.0",
+        "xml-name-validator": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "peerDependencies": {
+        "canvas": "^2.5.0"
+      },
+      "peerDependenciesMeta": {
+        "canvas": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/jsesc": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-3.1.0.tgz",
@@ -3601,6 +4005,13 @@
         "node": ">=8"
       }
     },
+    "node_modules/nwsapi": {
+      "version": "2.2.23",
+      "resolved": "https://registry.npmjs.org/nwsapi/-/nwsapi-2.2.23.tgz",
+      "integrity": "sha512-7wfH4sLbt4M0gCDzGE6vzQBo0bfTKjU7Sfpqy/7gs1qBfYz2vEJH6vXcBKpO3+6Yu1telwd0t9HpyOoLEQQbIQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/object-inspect": {
       "version": "1.13.4",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.13.4.tgz",
@@ -3725,6 +4136,19 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "node_modules/parseurl": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
@@ -3875,6 +4299,29 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/psl": {
+      "version": "1.15.0",
+      "resolved": "https://registry.npmjs.org/psl/-/psl-1.15.0.tgz",
+      "integrity": "sha512-JZd3gMVBAVQkSs6HdNZo9Sdo0LNcQeMNP3CozBJb3JYC/QUYZTnKxP+f8oWRX4rHP5EurWxqAHTSwUCjlNKa1w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.3.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/lupomontero"
+      }
+    },
+    "node_modules/punycode": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/pure-rand": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/pure-rand/-/pure-rand-6.1.0.tgz",
@@ -3907,6 +4354,13 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/querystringify": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/querystringify/-/querystringify-2.2.0.tgz",
+      "integrity": "sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/range-parser": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
@@ -3948,6 +4402,13 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/requires-port": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
+      "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/resolve": {
       "version": "1.22.12",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.12.tgz",
@@ -4029,6 +4490,19 @@
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
       "license": "MIT"
     },
+    "node_modules/saxes": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/saxes/-/saxes-6.0.0.tgz",
+      "integrity": "sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "xmlchars": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=v12.22.7"
+      }
+    },
     "node_modules/semver": {
       "version": "6.3.1",
       "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
@@ -4449,6 +4923,13 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/symbol-tree": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/test-exclude": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
@@ -4493,6 +4974,35 @@
         "node": ">=0.6"
       }
     },
+    "node_modules/tough-cookie": {
+      "version": "4.1.4",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.1.4.tgz",
+      "integrity": "sha512-Loo5UUvLD9ScZ6jh8beX1T6sO1w2/MpCRpEP7V280GKMVUQ0Jzar2U3UJPsrdbziLEMMhu3Ujnq//rhiFuIeag==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "psl": "^1.1.33",
+        "punycode": "^2.1.1",
+        "universalify": "^0.2.0",
+        "url-parse": "^1.5.3"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-3.0.0.tgz",
+      "integrity": "sha512-l7FvfAHlcmulp8kr+flpQZmVwtu7nfRV7NZujtN0OqES8EL4O4e0qqzL0DC5gAvx/ZC/9lk6rhcUwYvkBnBnYA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/type-detect": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
@@ -4536,6 +5046,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "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,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 4.0.0"
+      }
+    },
     "node_modules/unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -4576,6 +5096,17 @@
         "browserslist": ">= 4.21.0"
       }
     },
+    "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,
+      "license": "MIT",
+      "dependencies": {
+        "querystringify": "^2.1.1",
+        "requires-port": "^1.0.0"
+      }
+    },
     "node_modules/utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
@@ -4609,6 +5140,19 @@
         "node": ">= 0.8"
       }
     },
+    "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,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/walker": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.8.tgz",
@@ -4619,6 +5163,67 @@
         "makeerror": "1.0.12"
       }
     },
+    "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,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "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==",
+      "deprecated": "Use @exodus/bytes instead for a more spec-conformant and faster implementation",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "iconv-lite": "0.6.3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-encoding/node_modules/iconv-lite": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
+      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "safer-buffer": ">= 2.1.2 < 3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "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,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "11.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-11.0.0.tgz",
+      "integrity": "sha512-RKT8HExMpoYx4igMiVMY83lN6UeITKJlBQ+vR/8ZJ8OCdSiN3RwCq+9gH0+Xzj0+5IrM6i4j/6LuvzbZIQgEcQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "^3.0.0",
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -4674,6 +5279,45 @@
         "node": "^12.13.0 || ^14.15.0 || >=16.0.0"
       }
     },
+    "node_modules/ws": {
+      "version": "8.20.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.20.0.tgz",
+      "integrity": "sha512-sAt8BhgNbzCtgGbt2OxmpuryO63ZoDk/sqaB/znQm94T4fCEsy/yV+7CdC1kJhOU9lboAEU7R3kquuycDoibVA==",
+      "dev": true,
+      "license": "MIT",
+      "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,
+      "license": "Apache-2.0",
+      "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,
+      "license": "MIT"
+    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",

package.json

@@ -5,13 +5,19 @@
   "main": "index.js",
   "scripts": {
     "start": "node index.js",
-    "test": "jest"
+    "test": "jest --coverage"
   },
   "dependencies": {
     "express": "^4.18.2"
   },
   "devDependencies": {
     "jest": "^29.5.0",
+    "jest-environment-jsdom": "^29.5.0",
     "supertest": "^6.3.3"
+  },
+  "jest": {
+    "collectCoverageFrom": ["index.js", "public/game.js"],
+    "coverageReporters": ["lcov", "text"],
+    "coverageDirectory": "coverage"
   }
 }

test/game.test.js

@@ -0,0 +1,157 @@
+/**
+ * @jest-environment jsdom
+ */
+
+function setupDOM() {
+  document.body.innerHTML = `
+    <div id="status">Player X's turn</div>
+    <div id="board">
+      ${Array.from({ length: 9 }, (_, i) => `<div class="cell" data-index="${i}"></div>`).join('')}
+    </div>
+    <span id="score-x">0</span>
+    <span id="score-draw">0</span>
+    <span id="score-o">0</span>
+    <button id="reset">New Game</button>
+  `;
+}
+
+function click(index) {
+  document.querySelectorAll('.cell')[index].dispatchEvent(new MouseEvent('click', { bubbles: true }));
+}
+
+function reset() {
+  document.getElementById('reset').dispatchEvent(new MouseEvent('click', { bubbles: true }));
+}
+
+beforeEach(() => {
+  setupDOM();
+  jest.resetModules();
+  require('../public/game.js');
+});
+
+describe('initial state', () => {
+  test('all cells empty', () => {
+    document.querySelectorAll('.cell').forEach(c => expect(c.textContent).toBe(''));
+  });
+
+  test('status shows X turn', () => {
+    expect(document.getElementById('status').textContent).toBe("Player X's turn");
+  });
+
+  test('scores start at 0', () => {
+    expect(document.getElementById('score-x').textContent).toBe('0');
+    expect(document.getElementById('score-o').textContent).toBe('0');
+    expect(document.getElementById('score-draw').textContent).toBe('0');
+  });
+});
+
+describe('turn alternation', () => {
+  test('alternates X and O after each move', () => {
+    click(0);
+    expect(document.getElementById('status').textContent).toBe("Player O's turn");
+    click(1);
+    expect(document.getElementById('status').textContent).toBe("Player X's turn");
+  });
+
+  test('cell shows correct player mark', () => {
+    click(0);
+    expect(document.querySelectorAll('.cell')[0].textContent).toBe('X');
+    click(1);
+    expect(document.querySelectorAll('.cell')[1].textContent).toBe('O');
+  });
+
+  test('clicking taken cell does nothing', () => {
+    click(0);
+    click(0);
+    expect(document.getElementById('status').textContent).toBe("Player O's turn");
+  });
+});
+
+describe('X wins', () => {
+  // X: 0,1,2  O: 3,4
+  beforeEach(() => { click(0); click(3); click(1); click(4); click(2); });
+
+  test('status shows X wins', () => {
+    expect(document.getElementById('status').textContent).toBe('Player X wins!');
+  });
+
+  test('winning cells get winner class', () => {
+    const cells = document.querySelectorAll('.cell');
+    expect(cells[0].classList.contains('winner')).toBe(true);
+    expect(cells[1].classList.contains('winner')).toBe(true);
+    expect(cells[2].classList.contains('winner')).toBe(true);
+  });
+
+  test('X score increments', () => {
+    expect(document.getElementById('score-x').textContent).toBe('1');
+  });
+
+  test('no moves accepted after win', () => {
+    click(5);
+    expect(document.querySelectorAll('.cell')[5].textContent).toBe('');
+  });
+});
+
+describe('O wins', () => {
+  // X: 0,6,7  O: 3,4,5
+  beforeEach(() => { click(0); click(3); click(6); click(4); click(7); click(5); });
+
+  test('status shows O wins', () => {
+    expect(document.getElementById('status').textContent).toBe('Player O wins!');
+  });
+
+  test('O score increments', () => {
+    expect(document.getElementById('score-o').textContent).toBe('1');
+  });
+});
+
+describe('draw', () => {
+  // X: 0,2,5,6,7  O: 1,3,4,8 — fills board, no winner
+  beforeEach(() => {
+    click(0); click(1); click(2); click(3); click(5); click(4); click(6); click(8); click(7);
+  });
+
+  test('status shows draw', () => {
+    expect(document.getElementById('status').textContent).toBe("It's a draw!");
+  });
+
+  test('draw score increments', () => {
+    expect(document.getElementById('score-draw').textContent).toBe('1');
+  });
+});
+
+describe('reset', () => {
+  test('clears board after game', () => {
+    click(0); click(1);
+    reset();
+    document.querySelectorAll('.cell').forEach(c => expect(c.textContent).toBe(''));
+  });
+
+  test('resets status to X turn', () => {
+    click(0);
+    reset();
+    expect(document.getElementById('status').textContent).toBe("Player X's turn");
+  });
+
+  test('score persists across reset', () => {
+    click(0); click(3); click(1); click(4); click(2);
+    reset();
+    expect(document.getElementById('score-x').textContent).toBe('1');
+  });
+
+  test('allows play after reset', () => {
+    click(0); click(1); click(2); click(3); click(4); click(5); click(6); click(7); click(8);
+    reset();
+    click(0);
+    expect(document.querySelectorAll('.cell')[0].textContent).toBe('X');
+  });
+});
+
+describe('score accumulates across games', () => {
+  test('multiple wins tracked', () => {
+    click(0); click(3); click(1); click(4); click(2);
+    reset();
+    click(0); click(3); click(1); click(4); click(2);
+    expect(document.getElementById('score-x').textContent).toBe('2');
+  });
+});