Merge remote-tracking branch 'origin/prop/js-tests'

12 files changed, 1273 insertions, 3 deletions

diff --git a/.gitignore b/.gitignore
index 11b7d6f..7a5c67e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@
 /pilcrow.db.backup
 /pilcrow.db.pre-commit
 /vite.config.js.*.mjs
+/coverage
diff --git a/package-lock.json b/package-lock.json
index 01b0cce..335880f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -20,17 +20,20 @@
 				"@sveltejs/vite-plugin-svelte": "^4.0.0",
 				"@tailwindcss/forms": "^0.5.9",
 				"@types/eslint": "^9.6.1",
+				"@vitest/coverage-v8": "^2.1.4",
 				"autoprefixer": "^10.4.20",
 				"eslint": "^9.14.0",
 				"eslint-config-prettier": "^9.1.0",
 				"eslint-plugin-svelte": "^2.46.0",
 				"globals": "^15.11.0",
+				"jsdom": "^25.0.1",
 				"postcss": "^8.4.47",
 				"prettier": "^3.3.3",
 				"prettier-plugin-svelte": "^3.2.7",
 				"svelte": "^5.1.9",
 				"tailwindcss": "^3.4.14",
-				"vite": "^5.4.10"
+				"vite": "^5.4.10",
+				"vitest": "^2.1.4"
 			},
 			"engines": {
 				"node": ">=22.0.0 <23.0.0",
@@ -64,6 +67,63 @@
 				"node": ">=6.0.0"
 			}
 		},
+		"node_modules/@babel/helper-string-parser": {
+			"version": "7.25.9",
+			"resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.25.9.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=6.9.0"
+			}
+		},
+		"node_modules/@babel/helper-validator-identifier": {
+			"version": "7.25.9",
+			"resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.25.9.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=6.9.0"
+			}
+		},
+		"node_modules/@babel/parser": {
+			"version": "7.26.2",
+			"resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.26.2.tgz",
+			"integrity": "sha512-DWMCZH9WA4Maitz2q21SRKHo9QXZxkDsbNZoVD62gusNtNBBqDg9i7uOhASfTfIGNzW+O+r7+jAlM8dwphcJKQ==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@babel/types": "^7.26.0"
+			},
+			"bin": {
+				"parser": "bin/babel-parser.js"
+			},
+			"engines": {
+				"node": ">=6.0.0"
+			}
+		},
+		"node_modules/@babel/types": {
+			"version": "7.26.0",
+			"resolved": "https://registry.npmjs.org/@babel/types/-/types-7.26.0.tgz",
+			"integrity": "sha512-Z/yiTPj+lDVnF7lWeKCIJzaIkI0vYO87dMpZ4bg4TDrFe4XXLFWL1TbXU27gBP3QccxV9mZICCrnjnYlJjXHOA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@babel/helper-string-parser": "^7.25.9",
+				"@babel/helper-validator-identifier": "^7.25.9"
+			},
+			"engines": {
+				"node": ">=6.9.0"
+			}
+		},
+		"node_modules/@bcoe/v8-coverage": {
+			"version": "0.2.3",
+			"resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-0.2.3.tgz",
+			"integrity": "sha512-0hYQ8SB4Db5zvZB4axdMHGwEaQjkZzFjQiN9LVYvIFB2nSUHW9tYpxWriPrWDASIxiaXax83REcLxuSdnGPZtw==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/@esbuild/darwin-arm64": {
 			"version": "0.21.5",
 			"resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.21.5.tgz",
@@ -333,6 +393,16 @@
 				"node": ">=12"
 			}
 		},
+		"node_modules/@istanbuljs/schema": {
+			"version": "0.1.3",
+			"resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.3.tgz",
+			"integrity": "sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=8"
+			}
+		},
 		"node_modules/@jridgewell/gen-mapping": {
 			"version": "0.3.5",
 			"resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.5.tgz",
@@ -663,6 +733,152 @@
 			"dev": true,
 			"license": "MIT"
 		},
+		"node_modules/@vitest/coverage-v8": {
+			"version": "2.1.4",
+			"resolved": "https://registry.npmjs.org/@vitest/coverage-v8/-/coverage-v8-2.1.4.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@ampproject/remapping": "^2.3.0",
+				"@bcoe/v8-coverage": "^0.2.3",
+				"debug": "^4.3.7",
+				"istanbul-lib-coverage": "^3.2.2",
+				"istanbul-lib-report": "^3.0.1",
+				"istanbul-lib-source-maps": "^5.0.6",
+				"istanbul-reports": "^3.1.7",
+				"magic-string": "^0.30.12",
+				"magicast": "^0.3.5",
+				"std-env": "^3.7.0",
+				"test-exclude": "^7.0.1",
+				"tinyrainbow": "^1.2.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/vitest"
+			},
+			"peerDependencies": {
+				"@vitest/browser": "2.1.4",
+				"vitest": "2.1.4"
+			},
+			"peerDependenciesMeta": {
+				"@vitest/browser": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/@vitest/expect": {
+			"version": "2.1.4",
+			"resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-2.1.4.tgz",
+			"integrity": "sha512-DOETT0Oh1avie/D/o2sgMHGrzYUFFo3zqESB2Hn70z6QB1HrS2IQ9z5DfyTqU8sg4Bpu13zZe9V4+UTNQlUeQA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@vitest/spy": "2.1.4",
+				"@vitest/utils": "2.1.4",
+				"chai": "^5.1.2",
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+			"funding": {
+				"url": "https://opencollective.com/vitest"
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+		"node_modules/@vitest/mocker": {
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+			"resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-2.1.4.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
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+				"estree-walker": "^3.0.3",
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+			"funding": {
+				"url": "https://opencollective.com/vitest"
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+				"msw": {
+					"optional": true
+				},
+				"vite": {
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+		"node_modules/@vitest/pretty-format": {
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+		"node_modules/@vitest/snapshot": {
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+		"node_modules/@vitest/spy": {
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+			"resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-2.1.4.tgz",
+			"integrity": "sha512-4JOxa+UAizJgpZfaCPKK2smq9d8mmjZVPMt2kOsg/R8QkoRzydHH1qHxIYNvr1zlEaFj4SXiaaJWxq/LPLKaLg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"tinyspy": "^3.0.2"
+			},
+			"funding": {
+				"url": "https://opencollective.com/vitest"
+			}
+		},
+		"node_modules/@vitest/utils": {
+			"version": "2.1.4",
+			"resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-2.1.4.tgz",
+			"integrity": "sha512-MXDnZn0Awl2S86PSNIim5PWXgIAx8CIkzu35mBdSApUip6RFOGXBCf3YFyeEu8n1IHk4bWD46DeYFu9mQlFIRg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@vitest/pretty-format": "2.1.4",
+				"loupe": "^3.1.2",
+				"tinyrainbow": "^1.2.0"
+			},
+			"funding": {
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 		"node_modules/acorn": {
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@@ -696,6 +912,19 @@
 				"acorn": ">=8.9.0"
 			}
 		},
+		"node_modules/agent-base": {
+			"version": "7.1.1",
+			"resolved": "https://registry.npmjs.org/agent-base/-/agent-base-7.1.1.tgz",
+			"integrity": "sha512-H0TSyFNDMomMNJQBn8wFV5YC/2eJ+VXECwOadZJT554xP6cODZHPX3H9QMQECxvrgiSOP1pHjy1sMWQVYJOUOA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"debug": "^4.3.4"
+			},
+			"engines": {
+				"node": ">= 14"
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 		"node_modules/ajv": {
 			"version": "6.12.6",
 			"resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
@@ -787,6 +1016,16 @@
 				"node": ">= 0.4"
 			}
 		},
+		"node_modules/assertion-error": {
+			"version": "2.0.1",
+			"resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=12"
+			}
+		},
 		"node_modules/asynckit": {
 			"version": "0.4.0",
 			"resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -929,6 +1168,16 @@
 				"node": "^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7"
 			}
 		},
+		"node_modules/cac": {
+			"version": "6.7.14",
+			"resolved": "https://registry.npmjs.org/cac/-/cac-6.7.14.tgz",
+			"integrity": "sha512-b6Ilus+c3RrdDk+JhLKUAQfzzgLEPy6wcXqS7f/xe1EETvsDP6GORG7SFuOs6cID5YkqchW/LXZbX5bc8j7ZcQ==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=8"
+			}
+		},
 		"node_modules/callsites": {
 			"version": "3.1.0",
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@@ -970,6 +1219,23 @@
 			],
 			"license": "CC-BY-4.0"
 		},
+		"node_modules/chai": {
+			"version": "5.1.2",
+			"resolved": "https://registry.npmjs.org/chai/-/chai-5.1.2.tgz",
+			"integrity": "sha512-aGtmf24DW6MLHHG5gCx4zaI3uBq3KRtxeVs0DjFH6Z0rDNbsvTxFASFvdj79pxjxZ8/5u3PIiN3IwEIQkiiuPw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"assertion-error": "^2.0.1",
+				"check-error": "^2.1.1",
+				"deep-eql": "^5.0.1",
+				"loupe": "^3.1.0",
+				"pathval": "^2.0.0"
+			},
+			"engines": {
+				"node": ">=12"
+			}
+		},
 		"node_modules/chalk": {
 			"version": "4.1.2",
 			"resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
@@ -987,6 +1253,16 @@
 				"url": "https://github.com/chalk/chalk?sponsor=1"
 			}
 		},
+		"node_modules/check-error": {
+			"version": "2.1.1",
+			"resolved": "https://registry.npmjs.org/check-error/-/check-error-2.1.1.tgz",
+			"integrity": "sha512-OAlb+T7V4Op9OwdkjmguYRqncdlx5JiofwOAUkmTF+jNdHwzTaTs4sRAGpzLF3oOz5xAyDGrPgeIDFQmDOTiJw==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">= 16"
+			}
+		},
 		"node_modules/chokidar": {
 			"version": "3.6.0",
 			"resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.6.0.tgz",
@@ -1112,6 +1388,33 @@
 				"node": ">=4"
 			}
 		},
+		"node_modules/cssstyle": {
+			"version": "4.1.0",
+			"resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-4.1.0.tgz",
+			"integrity": "sha512-h66W1URKpBS5YMI/V8PyXvTMFT8SupJ1IzoIV8IeBC/ji8WVmrO8dGlTi+2dh6whmdk6BiKJLD/ZBkhWbcg6nA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"rrweb-cssom": "^0.7.1"
+			},
+			"engines": {
+				"node": ">=18"
+			}
+		},
+		"node_modules/data-urls": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/data-urls/-/data-urls-5.0.0.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"whatwg-mimetype": "^4.0.0",
+				"whatwg-url": "^14.0.0"
+			},
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@@ -1130,6 +1433,23 @@
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+		"node_modules/decimal.js": {
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+			"resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.4.3.tgz",
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+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/deep-eql": {
+			"version": "5.0.2",
+			"resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-5.0.2.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"engines": {
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@@ -1204,6 +1524,19 @@
 			"dev": true,
 			"license": "MIT"
 		},
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+			"dev": true,
+			"license": "BSD-2-Clause",
+			"engines": {
+				"node": ">=0.12"
+			},
+			"funding": {
+				"url": "https://github.com/fb55/entities?sponsor=1"
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 		"node_modules/esbuild": {
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@@ -1493,6 +1826,16 @@
 				"node": ">=4.0"
 			}
 		},
+		"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"
+			}
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@@ -1503,6 +1846,16 @@
 				"node": ">=0.10.0"
 			}
 		},
+		"node_modules/expect-type": {
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+			"license": "BSD-3-Clause",
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+				"node": ">=16 || 14 >=14.17"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/isaacs"
+			}
+		},
 		"node_modules/text-table": {
 			"version": "0.2.0",
 			"resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -3372,6 +4056,70 @@
 				"globrex": "^0.1.2"
 			}
 		},
+		"node_modules/tinybench": {
+			"version": "2.9.0",
+			"resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+			"integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/tinyexec": {
+			"version": "0.3.1",
+			"resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-0.3.1.tgz",
+			"integrity": "sha512-WiCJLEECkO18gwqIp6+hJg0//p23HXp4S+gGtAKu3mI2F2/sXC4FvHvXvB0zJVVaTPhx1/tOwdbRsa1sOBIKqQ==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/tinypool": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/tinypool/-/tinypool-1.0.1.tgz",
+			"integrity": "sha512-URZYihUbRPcGv95En+sz6MfghfIc2OJ1sv/RmhWZLouPY0/8Vo80viwPvg3dlaS9fuq7fQMEfgRRK7BBZThBEA==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": "^18.0.0 || >=20.0.0"
+			}
+		},
+		"node_modules/tinyrainbow": {
+			"version": "1.2.0",
+			"resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-1.2.0.tgz",
+			"integrity": "sha512-weEDEq7Z5eTHPDh4xjX789+fHfF+P8boiFB+0vbWzpbnbsEr/GRaohi/uMKxg8RZMXnl1ItAi/IUHWMsjDV7kQ==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=14.0.0"
+			}
+		},
+		"node_modules/tinyspy": {
+			"version": "3.0.2",
+			"resolved": "https://registry.npmjs.org/tinyspy/-/tinyspy-3.0.2.tgz",
+			"integrity": "sha512-n1cw8k1k0x4pgA2+9XrOkFydTerNcJ1zWCO5Nn9scWHTD+5tp8dghT2x1uduQePZTZgd3Tupf+x9BxJjeJi77Q==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=14.0.0"
+			}
+		},
+		"node_modules/tldts": {
+			"version": "6.1.60",
+			"resolved": "https://registry.npmjs.org/tldts/-/tldts-6.1.60.tgz",
+			"integrity": "sha512-TYVHm7G9NCnhgqOsFalbX6MG1Po5F4efF+tLfoeiOGQq48Oqgwcgz8upY2R1BHWa4aDrj28RYx0dkYJ63qCFMg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"tldts-core": "^6.1.60"
+			},
+			"bin": {
+				"tldts": "bin/cli.js"
+			}
+		},
+		"node_modules/tldts-core": {
+			"version": "6.1.60",
+			"resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-6.1.60.tgz",
+			"integrity": "sha512-XHjoxak8SFQnHnmYHb3PcnW5TZ+9ErLZemZei3azuIRhQLw4IExsVbL3VZJdHcLeNaXq6NqawgpDPpjBOg4B5g==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/to-regex-range": {
 			"version": "5.0.1",
 			"resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -3395,6 +4143,32 @@
 				"node": ">=6"
 			}
 		},
+		"node_modules/tough-cookie": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-5.0.0.tgz",
+			"integrity": "sha512-FRKsF7cz96xIIeMZ82ehjC3xW2E+O2+v11udrDYewUbszngYhsGa8z6YUMMzO9QJZzzyd0nGGXnML/TReX6W8Q==",
+			"dev": true,
+			"license": "BSD-3-Clause",
+			"dependencies": {
+				"tldts": "^6.1.32"
+			},
+			"engines": {
+				"node": ">=16"
+			}
+		},
+		"node_modules/tr46": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/tr46/-/tr46-5.0.0.tgz",
+			"integrity": "sha512-tk2G5R2KRwBd+ZN0zaEXpmzdKyOYksXwywulIX95MBODjSzMIuQnQ3m8JxgbhnL1LeVo7lqQKsYa1O3Htl7K5g==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"punycode": "^2.3.1"
+			},
+			"engines": {
+				"node": ">=18"
+			}
+		},
 		"node_modules/ts-interface-checker": {
 			"version": "0.1.13",
 			"resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
@@ -3523,6 +4297,28 @@
 				}
 			}
 		},
+		"node_modules/vite-node": {
+			"version": "2.1.4",
+			"resolved": "https://registry.npmjs.org/vite-node/-/vite-node-2.1.4.tgz",
+			"integrity": "sha512-kqa9v+oi4HwkG6g8ufRnb5AeplcRw8jUF6/7/Qz1qRQOXHImG8YnLbB+LLszENwFnoBl9xIf9nVdCFzNd7GQEg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"cac": "^6.7.14",
+				"debug": "^4.3.7",
+				"pathe": "^1.1.2",
+				"vite": "^5.0.0"
+			},
+			"bin": {
+				"vite-node": "vite-node.mjs"
+			},
+			"engines": {
+				"node": "^18.0.0 || >=20.0.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/vitest"
+			}
+		},
 		"node_modules/vitefu": {
 			"version": "1.0.3",
 			"resolved": "https://registry.npmjs.org/vitefu/-/vitefu-1.0.3.tgz",
@@ -3542,6 +4338,132 @@
 				}
 			}
 		},
+		"node_modules/vitest": {
+			"version": "2.1.4",
+			"resolved": "https://registry.npmjs.org/vitest/-/vitest-2.1.4.tgz",
+			"integrity": "sha512-eDjxbVAJw1UJJCHr5xr/xM86Zx+YxIEXGAR+bmnEID7z9qWfoxpHw0zdobz+TQAFOLT+nEXz3+gx6nUJ7RgmlQ==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@vitest/expect": "2.1.4",
+				"@vitest/mocker": "2.1.4",
+				"@vitest/pretty-format": "^2.1.4",
+				"@vitest/runner": "2.1.4",
+				"@vitest/snapshot": "2.1.4",
+				"@vitest/spy": "2.1.4",
+				"@vitest/utils": "2.1.4",
+				"chai": "^5.1.2",
+				"debug": "^4.3.7",
+				"expect-type": "^1.1.0",
+				"magic-string": "^0.30.12",
+				"pathe": "^1.1.2",
+				"std-env": "^3.7.0",
+				"tinybench": "^2.9.0",
+				"tinyexec": "^0.3.1",
+				"tinypool": "^1.0.1",
+				"tinyrainbow": "^1.2.0",
+				"vite": "^5.0.0",
+				"vite-node": "2.1.4",
+				"why-is-node-running": "^2.3.0"
+			},
+			"bin": {
+				"vitest": "vitest.mjs"
+			},
+			"engines": {
+				"node": "^18.0.0 || >=20.0.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/vitest"
+			},
+			"peerDependencies": {
+				"@edge-runtime/vm": "*",
+				"@types/node": "^18.0.0 || >=20.0.0",
+				"@vitest/browser": "2.1.4",
+				"@vitest/ui": "2.1.4",
+				"happy-dom": "*",
+				"jsdom": "*"
+			},
+			"peerDependenciesMeta": {
+				"@edge-runtime/vm": {
+					"optional": true
+				},
+				"@types/node": {
+					"optional": true
+				},
+				"@vitest/browser": {
+					"optional": true
+				},
+				"@vitest/ui": {
+					"optional": true
+				},
+				"happy-dom": {
+					"optional": true
+				},
+				"jsdom": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/w3c-xmlserializer": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+			"integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"xml-name-validator": "^5.0.0"
+			},
+			"engines": {
+				"node": ">=18"
+			}
+		},
+		"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": "3.1.1",
+			"resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz",
+			"integrity": "sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"iconv-lite": "0.6.3"
+			},
+			"engines": {
+				"node": ">=18"
+			}
+		},
+		"node_modules/whatwg-mimetype": {
+			"version": "4.0.0",
+			"resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
+			"integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=18"
+			}
+		},
+		"node_modules/whatwg-url": {
+			"version": "14.0.0",
+			"resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-14.0.0.tgz",
+			"integrity": "sha512-1lfMEm2IEr7RIV+f4lUNPOqfFL+pO+Xw3fJSqmjX9AbXcXcYOkCe1P6+9VBZB6n94af16NfZf+sSk0JCBZC9aw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"tr46": "^5.0.0",
+				"webidl-conversions": "^7.0.0"
+			},
+			"engines": {
+				"node": ">=18"
+			}
+		},
 		"node_modules/which": {
 			"version": "2.0.2",
 			"resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -3558,6 +4480,23 @@
 				"node": ">= 8"
 			}
 		},
+		"node_modules/why-is-node-running": {
+			"version": "2.3.0",
+			"resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+			"integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"siginfo": "^2.0.0",
+				"stackback": "0.0.2"
+			},
+			"bin": {
+				"why-is-node-running": "cli.js"
+			},
+			"engines": {
+				"node": ">=8"
+			}
+		},
 		"node_modules/word-wrap": {
 			"version": "1.2.5",
 			"resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
@@ -3663,6 +4602,45 @@
 				"url": "https://github.com/chalk/ansi-styles?sponsor=1"
 			}
 		},
+		"node_modules/ws": {
+			"version": "8.18.0",
+			"resolved": "https://registry.npmjs.org/ws/-/ws-8.18.0.tgz",
+			"integrity": "sha512-8VbfWfHLbbwu3+N6OKsOMpBdT4kXPDDB9cJk2bJ6mh9ucxdlnNvH1e+roYkKmN9Nxw2yjz7VzeO9oOz2zJ04Pw==",
+			"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": "5.0.0",
+			"resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+			"integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+			"dev": true,
+			"license": "Apache-2.0",
+			"engines": {
+				"node": ">=18"
+			}
+		},
+		"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/yaml": {
 			"version": "1.10.2",
 			"resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.2.tgz",
diff --git a/package.json b/package.json
index c51974c..18a80f4 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,9 @@
 		"build": "vite build",
 		"preview": "vite preview",
 		"lint": "prettier --check ui && eslint ui",
-		"format": "prettier --write ui"
+		"format": "prettier --write ui",
+		"test": "vitest",
+		"coverage": "vitest run --coverage"
 	},
 	"devDependencies": {
 		"@skeletonlabs/skeleton": "^2.10.3",
@@ -21,17 +23,20 @@
 		"@sveltejs/vite-plugin-svelte": "^4.0.0",
 		"@tailwindcss/forms": "^0.5.9",
 		"@types/eslint": "^9.6.1",
+		"@vitest/coverage-v8": "^2.1.4",
 		"autoprefixer": "^10.4.20",
 		"eslint": "^9.14.0",
 		"eslint-config-prettier": "^9.1.0",
 		"eslint-plugin-svelte": "^2.46.0",
 		"globals": "^15.11.0",
+		"jsdom": "^25.0.1",
 		"postcss": "^8.4.47",
 		"prettier": "^3.3.3",
 		"prettier-plugin-svelte": "^3.2.7",
 		"svelte": "^5.1.9",
 		"tailwindcss": "^3.4.14",
-		"vite": "^5.4.10"
+		"vite": "^5.4.10",
+		"vitest": "^2.1.4"
 	},
 	"type": "module",
 	"dependencies": {
diff --git a/ui/tests/lib/components/ActiveChannel.svelte.test.js b/ui/tests/lib/components/ActiveChannel.svelte.test.js
new file mode 100644
index 0000000..34e92d3
--- /dev/null
+++ b/ui/tests/lib/components/ActiveChannel.svelte.test.js
@@ -0,0 +1,22 @@
+import { flushSync, mount, unmount } from 'svelte';
+import { afterEach, beforeEach, describe, expect, test } from 'vitest';
+import ActiveChannel from '$lib/components/ActiveChannel.svelte';
+
+let component;
+
+describe('ActiveChannel', () => {
+  beforeEach(() => {
+    component = mount(ActiveChannel, {
+      target: document.body, // `document` exists because of jsdom
+    });
+    flushSync();
+  });
+
+  afterEach(() => {
+    unmount(component);
+  });
+
+  test('mounts', async () => {
+    expect(component).toBeTruthy();
+  });
+});
diff --git a/ui/tests/lib/components/ChangePassword.svelte.test.js b/ui/tests/lib/components/ChangePassword.svelte.test.js
new file mode 100644
index 0000000..5773eae
--- /dev/null
+++ b/ui/tests/lib/components/ChangePassword.svelte.test.js
@@ -0,0 +1,52 @@
+import { flushSync, mount, unmount } from 'svelte';
+import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest';
+import ChangePassword from '$lib/components/ChangePassword.svelte';
+import axios from 'axios';
+
+let component;
+
+let mocks = vi.hoisted(() => ({
+  post: vi.fn(),
+}));
+
+describe('ChangePassword', () => {
+  beforeEach(() => {
+    vi.mock('axios', async (importActual) => {
+      const actual = await importActual();
+
+      const mockAxios = {
+        default: {
+          ...actual.default,
+          create: vi.fn(() => ({
+            ...actual.default.create(),
+            post: mocks.post,
+          })),
+        },
+      };
+
+      return mockAxios;
+    });
+    mocks.post.mockResolvedValue({ status: 200 });
+
+    component = mount(ChangePassword, {
+      target: document.body, // `document` exists because of jsdom
+    });
+    flushSync();
+  });
+
+  afterEach(() => {
+    unmount(component);
+  });
+
+  test('onsubmit happy path', async () => {
+    // Set value in all three inputs at once:
+    const inputs = document.body.querySelectorAll('input[type=password]');
+    inputs.value = 'pass';
+    // Click the button, then flush the changes so you can synchronously write expectations
+    document.body.querySelector('button[type=submit]').click();
+    flushSync();
+
+    // expect(axios.post).toHaveBeenCalledWith('/password', { password: 'pass', to: 'pass' });
+    expect(Array.from(inputs.values()).map((i) => i.value)).toEqual(['', '', '']);
+  });
+});
diff --git a/ui/tests/lib/components/Channel.svelte.test.js b/ui/tests/lib/components/Channel.svelte.test.js
new file mode 100644
index 0000000..e43fa12
--- /dev/null
+++ b/ui/tests/lib/components/Channel.svelte.test.js
@@ -0,0 +1,22 @@
+import { flushSync, mount, unmount } from 'svelte';
+import { afterEach, beforeEach, describe, expect, test } from 'vitest';
+import Channel from '$lib/components/Channel.svelte';
+
+let component;
+
+describe('Channel', () => {
+  beforeEach(() => {
+    component = mount(Channel, {
+      target: document.body, // `document` exists because of jsdom
+    });
+    flushSync();
+  });
+
+  afterEach(() => {
+    unmount(component);
+  });
+
+  test('mounts', async () => {
+    expect(component).toBeTruthy();
+  });
+});
diff --git a/ui/tests/lib/components/ChannelList.svelte.test.js b/ui/tests/lib/components/ChannelList.svelte.test.js
new file mode 100644
index 0000000..e6ec64d
--- /dev/null
+++ b/ui/tests/lib/components/ChannelList.svelte.test.js
@@ -0,0 +1,22 @@
+import { flushSync, mount, unmount } from 'svelte';
+import { afterEach, beforeEach, describe, expect, test } from 'vitest';
+import ChannelList from '$lib/components/ChannelList.svelte';
+
+let component;
+
+describe('ChannelList', () => {
+  beforeEach(() => {
+    component = mount(ChannelList, {
+      target: document.body, // `document` exists because of jsdom
+    });
+    flushSync();
+  });
+
+  afterEach(() => {
+    unmount(component);
+  });
+
+  test('mounts', async () => {
+    expect(component).toBeTruthy();
+  });
+});
diff --git a/ui/tests/lib/components/CreateChannelForm.svelte.test.js b/ui/tests/lib/components/CreateChannelForm.svelte.test.js
new file mode 100644
index 0000000..c1adba5
--- /dev/null
+++ b/ui/tests/lib/components/CreateChannelForm.svelte.test.js
@@ -0,0 +1,52 @@
+import { flushSync, mount, unmount } from 'svelte';
+import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest';
+import CreateChannelForm from '$lib/components/CreateChannelForm.svelte';
+import axios from 'axios';
+
+let component;
+
+let mocks = vi.hoisted(() => ({
+  post: vi.fn(),
+}));
+
+describe('CreateChannelForm', () => {
+  beforeEach(() => {
+    vi.mock('axios', async (importActual) => {
+      const actual = await importActual();
+
+      const mockAxios = {
+        default: {
+          ...actual.default,
+          create: vi.fn(() => ({
+            ...actual.default.create(),
+            post: mocks.post,
+          })),
+        },
+      };
+
+      return mockAxios;
+    });
+    mocks.post.mockResolvedValue({ status: 200 });
+
+    component = mount(CreateChannelForm, {
+      target: document.body, // `document` exists because of jsdom
+    });
+    flushSync();
+  });
+
+  afterEach(() => {
+    unmount(component);
+  });
+
+  test('onsubmit happy path', async () => {
+    // Set value on the one input this should match:
+    const inputs = document.body.querySelectorAll('input[type=text]');
+    inputs.value = 'channel name';
+    // Click the button, then flush the changes so you can synchronously write expectations
+    document.body.querySelector('button[type=submit]').click();
+    flushSync();
+
+    expect(mocks.post).toHaveBeenCalled();
+    expect(Array.from(inputs.values()).map((i) => i.value)).toEqual(['']);
+  });
+});
diff --git a/ui/tests/lib/components/LogIn.svelte.test.js b/ui/tests/lib/components/LogIn.svelte.test.js
new file mode 100644
index 0000000..3b1d299
--- /dev/null
+++ b/ui/tests/lib/components/LogIn.svelte.test.js
@@ -0,0 +1,22 @@
+import { flushSync, mount, unmount } from 'svelte';
+import { afterEach, beforeEach, describe, expect, test } from 'vitest';
+import LogIn from '$lib/components/LogIn.svelte';
+
+let component;
+
+describe('LogIn', () => {
+  beforeEach(() => {
+    component = mount(LogIn, {
+      target: document.body, // `document` exists because of jsdom
+    });
+    flushSync();
+  });
+
+  afterEach(() => {
+    unmount(component);
+  });
+
+  test('mounts', async () => {
+    expect(component).toBeTruthy();
+  });
+});
diff --git a/ui/tests/lib/components/MessageInput.svelte.test.js b/ui/tests/lib/components/MessageInput.svelte.test.js
new file mode 100644
index 0000000..d90026c
--- /dev/null
+++ b/ui/tests/lib/components/MessageInput.svelte.test.js
@@ -0,0 +1,48 @@
+import { flushSync, mount, unmount } from 'svelte';
+import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest';
+import MessageInput from '$lib/components/MessageInput.svelte';
+import axios from 'axios';
+
+let component;
+
+let mocks = vi.hoisted(() => ({
+  post: vi.fn(),
+}));
+
+describe('MessageInput', () => {
+  beforeEach(() => {
+    vi.mock('axios', async (importActual) => {
+      const actual = await importActual();
+
+      const mockAxios = {
+        default: {
+          ...actual.default,
+          create: vi.fn(() => ({
+            ...actual.default.create(),
+            post: mocks.post,
+          })),
+        },
+      };
+
+      return mockAxios;
+    });
+    mocks.post.mockResolvedValue({ status: 200 });
+
+    component = mount(MessageInput, {
+      target: document.body, // `document` exists because of jsdom
+    });
+    flushSync();
+  });
+
+  afterEach(() => {
+    unmount(component);
+  });
+
+  test('onsubmit happy path', async () => {
+    // Click the button, then flush the changes so you can synchronously write expectations
+    document.body.querySelector('button[type=submit]').click();
+    flushSync();
+
+    expect(mocks.post).toHaveBeenCalled();
+  });
+});
diff --git a/ui/tests/lib/components/MessageRun.svelte.test.js b/ui/tests/lib/components/MessageRun.svelte.test.js
new file mode 100644
index 0000000..480ce98
--- /dev/null
+++ b/ui/tests/lib/components/MessageRun.svelte.test.js
@@ -0,0 +1,22 @@
+import { flushSync, mount, unmount } from 'svelte';
+import { afterEach, beforeEach, describe, expect, test } from 'vitest';
+import MessageRun from '$lib/components/MessageRun.svelte';
+
+let component;
+
+describe('MessageRun', () => {
+  beforeEach(() => {
+    component = mount(MessageRun, {
+      target: document.body, // `document` exists because of jsdom
+    });
+    flushSync();
+  });
+
+  afterEach(() => {
+    unmount(component);
+  });
+
+  test('mounts', async () => {
+    expect(component).toBeTruthy();
+  });
+});
diff --git a/vite.config.js b/vite.config.js
index 863d652..e74647a 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -1,8 +1,32 @@
 import { sveltekit } from '@sveltejs/kit/vite';
 import { defineConfig } from 'vite';
+import { configDefaults } from 'vitest/config'
 
 export default defineConfig({
   plugins: [sveltekit()],
+  test: {
+    // If you are testing components client-side, you need to setup a DOM environment.
+    // If not all your files should have this environment, you can use a
+    // `// @vitest-environment jsdom` comment at the top of the test files instead.
+    environment: 'jsdom',
+    coverage: {
+      thresholds: {
+        statements: 49,
+        branches: 60,
+        functions: 14,
+        lines: 49
+      },
+      exclude: [
+        ...configDefaults.exclude,
+        '**/*.config.js',
+        '**/docs/**',
+        '**/target/**'
+      ]
+    }
+  },
+  // Tell Vitest to use the `browser` entry points in `package.json` files,
+  // even though it's running in Node
+	resolve: process.env.VITEST ? { conditions: ['browser'] } : undefined,
   server: {
     fs: {
       allow: [