test(#121): add @vitest/coverage-v8 with 80% branch coverage gate

Installs @vitest/coverage-v8 and configures coverage measurement over src/lib/utils/** and src/lib/server/** — the utility and server-side logic that is meaningful to measure in the Node test project. Svelte component files and generated code (api/**, paraglide/**) are excluded; those run in the browser project. Baseline: 87.87% branch coverage — already above the 80% threshold. Adds test:coverage script for local runs; produces lcov report for CI. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-28 16:36:08 +01:00
parent 3983771e79
commit e27af75e21
4 changed files with 198 additions and 0 deletions
--- a/frontend/.gitignore
+++ b/frontend/.gitignore
@@ -29,3 +29,4 @@ src/lib/paraglide
 # (committed as a stub; overwritten by the real spec after generation)
 # src/lib/generated/api.ts
 src/lib/paraglide_bak*
+/coverage
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -26,6 +26,7 @@
 				"@types/diff": "^7.0.2",
 				"@types/node": "^24",
 				"@vitest/browser-playwright": "^4.0.10",
+				"@vitest/coverage-v8": "^4.1.0",
 				"eslint": "^9.39.1",
 				"eslint-config-prettier": "^10.1.8",
 				"eslint-plugin-svelte": "^3.13.0",
@@ -61,6 +62,16 @@
 				"node": ">=6.9.0"
 			}
 		},
+		"node_modules/@babel/helper-string-parser": {
+			"version": "7.27.1",
+			"resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.27.1.tgz",
+			"integrity": "sha512-qMlSxKbpRlAridDExk92nSobyDdpPijUq2DW6oDnUqd0iOGxmQjyqhMIihI9+zv4LPyZdRje2cavWPbCbWm3eA==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=6.9.0"
+			}
+		},
 		"node_modules/@babel/helper-validator-identifier": {
 			"version": "7.28.5",
 			"resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.28.5.tgz",
@@ -71,6 +82,46 @@
 				"node": ">=6.9.0"
 			}
 		},
+		"node_modules/@babel/parser": {
+			"version": "7.29.2",
+			"resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.29.2.tgz",
+			"integrity": "sha512-4GgRzy/+fsBa72/RZVJmGKPmZu9Byn8o4MoLpmNe1m8ZfYnz5emHLQz3U4gLud6Zwl0RZIcgiLD7Uq7ySFuDLA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@babel/types": "^7.29.0"
+			},
+			"bin": {
+				"parser": "bin/babel-parser.js"
+			},
+			"engines": {
+				"node": ">=6.0.0"
+			}
+		},
+		"node_modules/@babel/types": {
+			"version": "7.29.0",
+			"resolved": "https://registry.npmjs.org/@babel/types/-/types-7.29.0.tgz",
+			"integrity": "sha512-LwdZHpScM4Qz8Xw2iKSzS+cfglZzJGvofQICy7W7v4caru4EaAmyUuO6BGrbyQ2mYV11W0U8j5mBhd14dd3B0A==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@babel/helper-string-parser": "^7.27.1",
+				"@babel/helper-validator-identifier": "^7.28.5"
+			},
+			"engines": {
+				"node": ">=6.9.0"
+			}
+		},
+		"node_modules/@bcoe/v8-coverage": {
+			"version": "1.0.2",
+			"resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+			"integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=18"
+			}
+		},
 		"node_modules/@blazediff/core": {
 			"version": "1.9.1",
 			"resolved": "https://registry.npmjs.org/@blazediff/core/-/core-1.9.1.tgz",
@@ -2522,6 +2573,37 @@
 				}
 			}
 		},
+		"node_modules/@vitest/coverage-v8": {
+			"version": "4.1.0",
+			"resolved": "https://registry.npmjs.org/@vitest/coverage-v8/-/coverage-v8-4.1.0.tgz",
+			"integrity": "sha512-nDWulKeik2bL2Va/Wl4x7DLuTKAXa906iRFooIRPR+huHkcvp9QDkPQ2RJdmjOFrqOqvNfoSQLF68deE3xC3CQ==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@bcoe/v8-coverage": "^1.0.2",
+				"@vitest/utils": "4.1.0",
+				"ast-v8-to-istanbul": "^1.0.0",
+				"istanbul-lib-coverage": "^3.2.2",
+				"istanbul-lib-report": "^3.0.1",
+				"istanbul-reports": "^3.2.0",
+				"magicast": "^0.5.2",
+				"obug": "^2.1.1",
+				"std-env": "^4.0.0-rc.1",
+				"tinyrainbow": "^3.0.3"
+			},
+			"funding": {
+				"url": "https://opencollective.com/vitest"
+			},
+			"peerDependencies": {
+				"@vitest/browser": "4.1.0",
+				"vitest": "4.1.0"
+			},
+			"peerDependenciesMeta": {
+				"@vitest/browser": {
+					"optional": true
+				}
+			}
+		},
 		"node_modules/@vitest/expect": {
 			"version": "4.1.0",
 			"resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-4.1.0.tgz",
@@ -2755,6 +2837,35 @@
 				"node": ">=12"
 			}
 		},
+		"node_modules/ast-v8-to-istanbul": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/ast-v8-to-istanbul/-/ast-v8-to-istanbul-1.0.0.tgz",
+			"integrity": "sha512-1fSfIwuDICFA4LKkCzRPO7F0hzFf0B7+Xqrl27ynQaa+Rh0e1Es0v6kWHPott3lU10AyAr7oKHa65OppjLn3Rg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@jridgewell/trace-mapping": "^0.3.31",
+				"estree-walker": "^3.0.3",
+				"js-tokens": "^10.0.0"
+			}
+		},
+		"node_modules/ast-v8-to-istanbul/node_modules/estree-walker": {
+			"version": "3.0.3",
+			"resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-3.0.3.tgz",
+			"integrity": "sha512-7RUKfXgSMMkzt6ZuXmqapOurLGPPfgj6l9uRZ7lRGolvk0y2yocc35LdcxKC5PQZdn2DMqioAQ2NoWcrTKmm6g==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@types/estree": "^1.0.0"
+			}
+		},
+		"node_modules/ast-v8-to-istanbul/node_modules/js-tokens": {
+			"version": "10.0.0",
+			"resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-10.0.0.tgz",
+			"integrity": "sha512-lM/UBzQmfJRo9ABXbPWemivdCW8V2G8FHaHdypQaIy523snUjog0W71ayWXTjiR+ixeMyVHN2XcpnTd/liPg/Q==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/axobject-query": {
 			"version": "4.1.0",
 			"resolved": "https://registry.npmjs.org/axobject-query/-/axobject-query-4.1.0.tgz",
@@ -3549,6 +3660,13 @@
 				"node": ">= 0.4"
 			}
 		},
+		"node_modules/html-escaper": {
+			"version": "2.0.2",
+			"resolved": "https://registry.npmjs.org/html-escaper/-/html-escaper-2.0.2.tgz",
+			"integrity": "sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/https-proxy-agent": {
 			"version": "7.0.6",
 			"resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-7.0.6.tgz",
@@ -3686,6 +3804,45 @@
 			"dev": true,
 			"license": "ISC"
 		},
+		"node_modules/istanbul-lib-coverage": {
+			"version": "3.2.2",
+			"resolved": "https://registry.npmjs.org/istanbul-lib-coverage/-/istanbul-lib-coverage-3.2.2.tgz",
+			"integrity": "sha512-O8dpsF+r0WV/8MNRKfnmrtCWhuKjxrq2w+jpzBL5UZKTi2LeVWnWOmWRxFlesJONmc+wLAGvKQZEOanko0LFTg==",
+			"dev": true,
+			"license": "BSD-3-Clause",
+			"engines": {
+				"node": ">=8"
+			}
+		},
+		"node_modules/istanbul-lib-report": {
+			"version": "3.0.1",
+			"resolved": "https://registry.npmjs.org/istanbul-lib-report/-/istanbul-lib-report-3.0.1.tgz",
+			"integrity": "sha512-GCfE1mtsHGOELCU8e/Z7YWzpmybrx/+dSTfLrvY8qRmaY6zXTKWn6WQIjaAFw069icm6GVMNkgu0NzI4iPZUNw==",
+			"dev": true,
+			"license": "BSD-3-Clause",
+			"dependencies": {
+				"istanbul-lib-coverage": "^3.0.0",
+				"make-dir": "^4.0.0",
+				"supports-color": "^7.1.0"
+			},
+			"engines": {
+				"node": ">=10"
+			}
+		},
+		"node_modules/istanbul-reports": {
+			"version": "3.2.0",
+			"resolved": "https://registry.npmjs.org/istanbul-reports/-/istanbul-reports-3.2.0.tgz",
+			"integrity": "sha512-HGYWWS/ehqTV3xN10i23tkPkpH46MLCIMFNCaaKNavAXTF1RkqxawEPtnjnGZ6XKSInBKkiOA5BKS+aZiY3AvA==",
+			"dev": true,
+			"license": "BSD-3-Clause",
+			"dependencies": {
+				"html-escaper": "^2.0.0",
+				"istanbul-lib-report": "^3.0.0"
+			},
+			"engines": {
+				"node": ">=8"
+			}
+		},
 		"node_modules/jiti": {
 			"version": "2.6.1",
 			"resolved": "https://registry.npmjs.org/jiti/-/jiti-2.6.1.tgz",
@@ -4129,6 +4286,34 @@
 				"@jridgewell/sourcemap-codec": "^1.5.5"
 			}
 		},
+		"node_modules/magicast": {
+			"version": "0.5.2",
+			"resolved": "https://registry.npmjs.org/magicast/-/magicast-0.5.2.tgz",
+			"integrity": "sha512-E3ZJh4J3S9KfwdjZhe2afj6R9lGIN5Pher1pF39UGrXRqq/VDaGVIGN13BjHd2u8B61hArAGOnso7nBOouW3TQ==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@babel/parser": "^7.29.0",
+				"@babel/types": "^7.29.0",
+				"source-map-js": "^1.2.1"
+			}
+		},
+		"node_modules/make-dir": {
+			"version": "4.0.0",
+			"resolved": "https://registry.npmjs.org/make-dir/-/make-dir-4.0.0.tgz",
+			"integrity": "sha512-hXdUTZYIVOt1Ex//jAQi+wTZZpUpwBj/0QsOzqegb3rGMMeJiSEu5xLHnYfBrRV4RH2+OCSOO95Is/7x1WJ4bw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"semver": "^7.5.3"
+			},
+			"engines": {
+				"node": ">=10"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/sindresorhus"
+			}
+		},
 		"node_modules/mini-svg-data-uri": {
 			"version": "1.4.4",
 			"resolved": "https://registry.npmjs.org/mini-svg-data-uri/-/mini-svg-data-uri-1.4.4.tgz",
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -14,6 +14,7 @@
 		"lint": "prettier --check . && eslint .",
 		"test:unit": "vitest",
 		"test": "npm run test:unit -- --run",
+		"test:coverage": "vitest run --coverage --project=server",
 		"test:e2e": "playwright test",
 		"test:e2e:headed": "playwright test --headed",
 		"test:e2e:ui": "playwright test --ui",
@@ -38,6 +39,7 @@
 		"@types/diff": "^7.0.2",
 		"@types/node": "^24",
 		"@vitest/browser-playwright": "^4.0.10",
+		"@vitest/coverage-v8": "^4.1.0",
 		"eslint": "^9.39.1",
 		"eslint-config-prettier": "^10.1.8",
 		"eslint-plugin-svelte": "^3.13.0",
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -43,6 +43,16 @@ export default defineConfig({
 	],
 	test: {
 		expect: { requireAssertions: true },
+		coverage: {
+			provider: 'v8',
+			reporter: ['text', 'lcov'],
+			// Measure utility and server-side logic only — Svelte components
+			// run in the browser project and are excluded here intentionally.
+			include: ['src/lib/utils/**', 'src/lib/server/**'],
+			thresholds: {
+				branches: 80
+			}
+		},
 		projects: [
 			{
 				extends: './vite.config.ts',