diff --git a/.vscode-test.js b/.vscode-test.js
new file mode 100644
index 00000000..0b3cae53
--- /dev/null
+++ b/.vscode-test.js
@@ -0,0 +1,11 @@
+const { defineConfig } = require('@vscode/test-cli')
+
+module.exports = defineConfig({
+  files: ['test/out/**/*.test.js'],
+  workspaceFolder: 'test/testWorkspace',
+
+  mocha: {
+    // Downloading compiler takes a long time
+    timeout: 120000,
+  },
+})
diff --git a/.vscodeignore b/.vscodeignore
index b7ba7ba8..4856096c 100644
--- a/.vscodeignore
+++ b/.vscodeignore
@@ -11,3 +11,5 @@ server
 client
 !server/out/server.js
 !client/out/extension.js
+test
+.vscode-test.js
diff --git a/DEV.md b/DEV.md
index 7ffbad40..dc657bf9 100644
--- a/DEV.md
+++ b/DEV.md
@@ -2,6 +2,10 @@
 
 Run `npm install` to ensure that the required dependencies are installed.
 
+## Testing
+
+The test suite can be run via `npm test`.
+
 ## Debugging
 
 Open the project in Visual Studio Code and find the menu `Run -> Start Debugging
diff --git a/client/src/services/state.ts b/client/src/services/state.ts
index d5a0c4e9..715bab77 100644
--- a/client/src/services/state.ts
+++ b/client/src/services/state.ts
@@ -27,11 +27,18 @@ enum StateKeys {
   installedFlixVersion = 'installedFlixVersion',
 }
 
-export function getInstalledFlixVersion(): FlixRelease {
+/**
+ * Get the installed Flix release if one exists.
+ *
+ * In the test environment this will always return `undefined` when called the first time in a test run,
+ * even if an installed Flix compiler exists.
+ * This happens because the extension's 'Memento' is reset between each run.
+ */
+export function getInstalledFlixVersion(): FlixRelease | undefined {
   return globalState?.get(StateKeys.installedFlixVersion)
 }
 
-export async function setInstalledFlixVersion(value) {
+export async function setInstalledFlixVersion(value: FlixRelease) {
   await globalState?.update(StateKeys.installedFlixVersion, value)
   return openFlixReleaseOverview(value)
 }
diff --git a/client/src/util/ensureFlixExists.ts b/client/src/util/ensureFlixExists.ts
index a28c3ac6..d2b21276 100644
--- a/client/src/util/ensureFlixExists.ts
+++ b/client/src/util/ensureFlixExists.ts
@@ -40,8 +40,8 @@ export default async function ensureFlixExists({ globalStoragePath, workspaceFol
     }
     // 2. If `flix.jar` exists in `globalStoragePath`, use that
     const filename = path.join(globalStoragePath, FLIX_JAR)
-    if (fs.existsSync(filename)) {
-      const installedFlixRelease: FlixRelease = getInstalledFlixVersion()
+    const installedFlixRelease = getInstalledFlixVersion()
+    if (fs.existsSync(filename) && installedFlixRelease) {
       const thirtyMinutesInMilliseconds = 1000 * 60 * 30
 
       // skip if we checked under 30 minutes ago
diff --git a/package-lock.json b/package-lock.json
index b119f4b0..94f2e1c3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,10 +15,12 @@
       "devDependencies": {
         "@types/mocha": "^10.0.1",
         "@types/node": "^18.19.11",
+        "@types/vscode": "^1.43.0",
         "@typescript-eslint/eslint-plugin": "^6.1.0",
+        "@vscode/test-cli": "^0.0.6",
+        "@vscode/test-electron": "^2.3.9",
         "esbuild": "^0.17.19",
         "eslint": "^8.1.0",
-        "mocha": "^10.2.0",
         "prettier": "^3.0.0",
         "typescript": "^5.0.4"
       },
@@ -35,6 +37,12 @@
         "node": ">=0.10.0"
       }
     },
+    "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
+    },
     "node_modules/@esbuild/android-arm": {
       "version": "0.17.19",
       "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.17.19.tgz",
@@ -476,6 +484,136 @@
       "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
       "dev": true
     },
+    "node_modules/@isaacs/cliui": {
+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
+      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
+      "dev": true,
+      "dependencies": {
+        "string-width": "^5.1.2",
+        "string-width-cjs": "npm:string-width@^4.2.0",
+        "strip-ansi": "^7.0.1",
+        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
+        "wrap-ansi": "^8.1.0",
+        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@isaacs/cliui/node_modules/ansi-regex": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.0.1.tgz",
+      "integrity": "sha512-n5M855fKb2SsfMIiFFoVrABHJC8QtHwVx+mHWP3QcEqBHYienj5dHSgjbxtC0WEZXYt4wcD6zrQElDPhFuZgfA==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/@isaacs/cliui/node_modules/ansi-styles": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.1.tgz",
+      "integrity": "sha512-bN798gFfQX+viw3R7yrGWRqnrN2oRkEkUjjl4JNn4E8GxxbjtG3FbrEIIY3l8/hrwUwIeCZvi4QuOTP4MErVug==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/@isaacs/cliui/node_modules/emoji-regex": {
+      "version": "9.2.2",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz",
+      "integrity": "sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==",
+      "dev": true
+    },
+    "node_modules/@isaacs/cliui/node_modules/string-width": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-5.1.2.tgz",
+      "integrity": "sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==",
+      "dev": true,
+      "dependencies": {
+        "eastasianwidth": "^0.2.0",
+        "emoji-regex": "^9.2.2",
+        "strip-ansi": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/@isaacs/cliui/node_modules/strip-ansi": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.0.tgz",
+      "integrity": "sha512-iq6eVVI64nQQTRYq2KtEg2d2uU7LElhTJwsH4YzIHZshxlgZms/wIc4VoDQTlG/IvVIrBKG06CrZnp0qv7hkcQ==",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
+    "node_modules/@isaacs/cliui/node_modules/wrap-ansi": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
+      "integrity": "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^6.1.0",
+        "string-width": "^5.0.1",
+        "strip-ansi": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "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,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
+      "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@jridgewell/sourcemap-codec": {
+      "version": "1.4.15",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.15.tgz",
+      "integrity": "sha512-eF2rxCRulEKXHTRiDrDy6erMYWqNw4LPdQ8UQA4huuxaQsVeRPFl2oM8oDGxMFhJUWZf9McpLtJasDDZb/Bpeg==",
+      "dev": true
+    },
+    "node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.22",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.22.tgz",
+      "integrity": "sha512-Wf963MzWtA2sjrNt+g18IAln9lKnlRp+K2eH4jjIoF1wYeq3aMREpG09xhlhdzS0EjwU7qmUJYangWa+151vZw==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.1.0",
+        "@jridgewell/sourcemap-codec": "^1.4.14"
+      }
+    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -511,6 +649,31 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@pkgjs/parseargs": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
+      "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==",
+      "dev": true,
+      "optional": true,
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@tootallnate/once": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
+      "integrity": "sha512-RbzJvlNzmRq5c3O09UipeuXno4tA1FE6ikOjxZK0tuxVv3412l64l5t1W5pj4+rJq9vpkm/kwiR07aZXnsKPxw==",
+      "dev": true,
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/@types/istanbul-lib-coverage": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.6.tgz",
+      "integrity": "sha512-2QF/t/auWm0lsy8XtKVPG19v3sSOQlJe/YHZgfjb/KBBHOGSV+J2q/S671rcq9uTBrLAXmZpqJiaQbMT+zNU1w==",
+      "dev": true
+    },
     "node_modules/@types/json-schema": {
       "version": "7.0.12",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.12.tgz",
@@ -518,9 +681,9 @@
       "dev": true
     },
     "node_modules/@types/mocha": {
-      "version": "10.0.1",
-      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-10.0.1.tgz",
-      "integrity": "sha512-/fvYntiO1GeICvqbQ3doGDIP97vWmvFt83GKguJ6prmQM2iXZfFcq6YE8KteFyRtX2/h5Hf91BYvPodJKFYv5Q==",
+      "version": "10.0.6",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-10.0.6.tgz",
+      "integrity": "sha512-dJvrYWxP/UcXm36Qn36fxhUKu8A/xMRXVT2cliFF1Z7UA9liG5Psj3ezNSZw+5puH2czDXRLcXQxf8JbJt0ejg==",
       "dev": true
     },
     "node_modules/@types/node": {
@@ -538,6 +701,12 @@
       "integrity": "sha512-G8hZ6XJiHnuhQKR7ZmysCeJWE08o8T0AXtk5darsCaTVsYZhhgUrq53jizaR2FvsoeCwJhlmwTjkXBY5Pn/ZHw==",
       "dev": true
     },
+    "node_modules/@types/vscode": {
+      "version": "1.86.0",
+      "resolved": "https://registry.npmjs.org/@types/vscode/-/vscode-1.86.0.tgz",
+      "integrity": "sha512-DnIXf2ftWv+9LWOB5OJeIeaLigLHF7fdXF6atfc7X5g2w/wVZBgk0amP7b+ub5xAuW1q7qP5YcFvOcit/DtyCQ==",
+      "dev": true
+    },
     "node_modules/@typescript-eslint/eslint-plugin": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-6.1.0.tgz",
@@ -729,6 +898,140 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
     },
+    "node_modules/@vscode/test-cli": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/@vscode/test-cli/-/test-cli-0.0.6.tgz",
+      "integrity": "sha512-4i61OUv5PQr3GxhHOuUgHdgBDfIO/kXTPCsEyFiMaY4SOqQTgkTmyZLagHehjOgCfsXdcrJa3zgQ7zoc+Dh6hQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/mocha": "^10.0.2",
+        "c8": "^9.1.0",
+        "chokidar": "^3.5.3",
+        "enhanced-resolve": "^5.15.0",
+        "glob": "^10.3.10",
+        "minimatch": "^9.0.3",
+        "mocha": "^10.2.0",
+        "supports-color": "^9.4.0",
+        "yargs": "^17.7.2"
+      },
+      "bin": {
+        "vscode-test": "out/bin.mjs"
+      }
+    },
+    "node_modules/@vscode/test-cli/node_modules/brace-expansion": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+      "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+      "dev": true,
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
+    "node_modules/@vscode/test-cli/node_modules/cliui": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
+      "integrity": "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==",
+      "dev": true,
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.1",
+        "wrap-ansi": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@vscode/test-cli/node_modules/glob": {
+      "version": "10.3.10",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-10.3.10.tgz",
+      "integrity": "sha512-fa46+tv1Ak0UPK1TOy/pZrIybNNt4HCv7SDzwyfiOZkvZLEbjsZkJBPtDHVshZjbecAoAGSC20MjLDG/qr679g==",
+      "dev": true,
+      "dependencies": {
+        "foreground-child": "^3.1.0",
+        "jackspeak": "^2.3.5",
+        "minimatch": "^9.0.1",
+        "minipass": "^5.0.0 || ^6.0.2 || ^7.0.0",
+        "path-scurry": "^1.10.1"
+      },
+      "bin": {
+        "glob": "dist/esm/bin.mjs"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "node_modules/@vscode/test-cli/node_modules/minimatch": {
+      "version": "9.0.3",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.3.tgz",
+      "integrity": "sha512-RHiac9mvaRw0x3AYRgDC1CxAP7HTcNrrECeA8YYJeWnpo+2Q5CegtZjaotWTWxDG3UeGA1coE05iH1mPjT/2mg==",
+      "dev": true,
+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "node_modules/@vscode/test-cli/node_modules/supports-color": {
+      "version": "9.4.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-9.4.0.tgz",
+      "integrity": "sha512-VL+lNrEoIXww1coLPOmiEmK/0sGigko5COxI09KzHc2VJXJsQ37UaQ+8quuxjDeA7+KnLGTWRyOXSLLR2Wb4jw==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/supports-color?sponsor=1"
+      }
+    },
+    "node_modules/@vscode/test-cli/node_modules/yargs": {
+      "version": "17.7.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
+      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "dev": true,
+      "dependencies": {
+        "cliui": "^8.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.3",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^21.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@vscode/test-cli/node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@vscode/test-electron": {
+      "version": "2.3.9",
+      "resolved": "https://registry.npmjs.org/@vscode/test-electron/-/test-electron-2.3.9.tgz",
+      "integrity": "sha512-z3eiChaCQXMqBnk2aHHSEkobmC2VRalFQN0ApOAtydL172zXGxTwGrRtviT5HnUB+Q+G3vtEYFtuQkYqBzYgMA==",
+      "dev": true,
+      "dependencies": {
+        "http-proxy-agent": "^4.0.1",
+        "https-proxy-agent": "^5.0.0",
+        "jszip": "^3.10.1",
+        "semver": "^7.5.2"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
     "node_modules/acorn": {
       "version": "8.10.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.10.0.tgz",
@@ -750,6 +1053,18 @@
         "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0"
       }
     },
+    "node_modules/agent-base": {
+      "version": "6.0.2",
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+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      }
+    },
+    "node_modules/readable-stream/node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "dev": true
+    },
     "node_modules/readdirp": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.6.0.tgz",
@@ -2189,6 +2825,12 @@
         "randombytes": "^2.1.0"
       }
     },
+    "node_modules/setimmediate": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
+      "integrity": "sha512-MATJdZp8sLqDl/68LfQmbP8zKPLQNV6BIZoIgrscFDQ+RsvK/BxeDQOgyxKKoh0y/8h3BqVFnCqQ/gd+reiIXA==",
+      "dev": true
+    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -2218,6 +2860,18 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/signal-exit": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
+      "integrity": "sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==",
+      "dev": true,
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/slash": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",
@@ -2227,6 +2881,21 @@
         "node": ">=8"
       }
     },
+    "node_modules/string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "dev": true,
+      "dependencies": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
+    "node_modules/string_decoder/node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "dev": true
+    },
     "node_modules/string-width": {
       "version": "4.2.3",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
@@ -2241,6 +2910,21 @@
         "node": ">=8"
       }
     },
+    "node_modules/string-width-cjs": {
+      "name": "string-width",
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "dev": true,
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/strip-ansi": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
@@ -2253,6 +2937,19 @@
         "node": ">=8"
       }
     },
+    "node_modules/strip-ansi-cjs": {
+      "name": "strip-ansi",
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/strip-json-comments": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
@@ -2277,6 +2974,29 @@
         "node": ">=8"
       }
     },
+    "node_modules/tapable": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.2.1.tgz",
+      "integrity": "sha512-GNzQvQTOIP6RyTfE2Qxb8ZVlNmw0n88vp1szwWRimP02mnTsx3Wtn5qRdqY9w2XduFNUgvOwhNnQsjwCp+kqaQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/test-exclude": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
+      "integrity": "sha512-cAGWPIyOHU6zlmg88jwm7VRyXnMN7iV68OGAbYDk/Mh/xC/pzVPlQtY6ngoIH/5/tciuhGfvESU8GrHrcxD56w==",
+      "dev": true,
+      "dependencies": {
+        "@istanbuljs/schema": "^0.1.2",
+        "glob": "^7.1.4",
+        "minimatch": "^3.0.4"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -2359,6 +3079,26 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "dev": true
+    },
+    "node_modules/v8-to-istanbul": {
+      "version": "9.2.0",
+      "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-9.2.0.tgz",
+      "integrity": "sha512-/EH/sDgxU2eGxajKdwLCDmQ4FWq+kpi3uCmBGpw1xJtnAxEjlD8j8PEiGWpCIMIs3ciNAgH0d3TTJiUkYzyZjA==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/trace-mapping": "^0.3.12",
+        "@types/istanbul-lib-coverage": "^2.0.1",
+        "convert-source-map": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=10.12.0"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -2397,6 +3137,24 @@
         "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
       }
     },
+    "node_modules/wrap-ansi-cjs": {
+      "name": "wrap-ansi",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
diff --git a/package.json b/package.json
index b4346f22..c127c5dc 100644
--- a/package.json
+++ b/package.json
@@ -124,15 +124,18 @@
     "vscode:prepublish": "npm run build",
     "build": "node build.js",
     "watch": "tsc -b -w",
-    "postinstall": "cd client && npm install && cd ../server && npm install && cd .."
+    "postinstall": "cd client && npm install && cd ../server && npm install && cd ..",
+    "test": "npm run build && tsc --build ./test && vscode-test"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.1",
     "@types/node": "^18.19.11",
+    "@types/vscode": "^1.43.0",
     "@typescript-eslint/eslint-plugin": "^6.1.0",
+    "@vscode/test-cli": "^0.0.6",
+    "@vscode/test-electron": "^2.3.9",
     "esbuild": "^0.17.19",
     "eslint": "^8.1.0",
-    "mocha": "^10.2.0",
     "prettier": "^3.0.0",
     "typescript": "^5.0.4"
   },
diff --git a/test/.eslintrc.json b/test/.eslintrc.json
new file mode 100644
index 00000000..da1fab98
--- /dev/null
+++ b/test/.eslintrc.json
@@ -0,0 +1,10 @@
+{
+  "extends": ["../.eslintrc.json"],
+  "globals": {
+    // Included Mocha globals
+    "suite": true,
+    "suiteSetup": true,
+    "suiteTeardown": true,
+    "test": true
+  }
+}
diff --git a/test/src/hover.test.ts b/test/src/hover.test.ts
new file mode 100644
index 00000000..8614eed2
--- /dev/null
+++ b/test/src/hover.test.ts
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2024 Holger Dal Mogensen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as assert from 'assert'
+import * as vscode from 'vscode'
+import { getTestDocUri, activate } from './util'
+
+suite('Hover info', () => {
+  let docUri: vscode.Uri
+  suiteSetup(async () => {
+    docUri = getTestDocUri('src/Main.flix')
+    await activate(docUri)
+  })
+
+  test('Hovering on an empty line should not show anything', async () => {
+    const position = new vscode.Position(0, 0)
+    const r = (await vscode.commands.executeCommand('vscode.executeHoverProvider', docUri, position)) as vscode.Hover[]
+    assert.strictEqual(r.length, 0)
+  })
+
+  /**
+   * Returns the given string, `s`, with all newlines replaced by a space.
+   */
+  function stripNewlines(s: string) {
+    return s.replaceAll(/(\r\n|\n|\r)/g, ' ')
+  }
+
+  /**
+   * Asserts that hovering at the given `position` in the document shows exactly one message, which contains the `expected` string.
+   */
+  async function testHoverAtPosition(position: vscode.Position, expected: string) {
+    const r = (await vscode.commands.executeCommand('vscode.executeHoverProvider', docUri, position)) as vscode.Hover[]
+
+    assert.strictEqual(r.length, 1)
+
+    const contents = r[0].contents[0] as vscode.MarkdownString
+    const actual = stripNewlines(contents.value)
+    assert.strictEqual(actual.includes(expected), true, `Actual: ${actual}\nExpected: ${expected}`)
+  }
+
+  test('Hovering on Unit should show Type', async () => {
+    const position = new vscode.Position(17, 12)
+    await testHoverAtPosition(position, 'Type')
+  })
+
+  test('Hovering on IO should show Eff', async () => {
+    const position = new vscode.Position(17, 19)
+    await testHoverAtPosition(position, 'Eff')
+  })
+
+  test('Hovering on Shape.Rectangle instantiation should show Shape', async () => {
+    const position = new vscode.Position(18, 13)
+    await testHoverAtPosition(position, 'Shape')
+  })
+
+  test('Hovering on area()-call should show def', async () => {
+    const position = new vscode.Position(18, 12)
+    await testHoverAtPosition(position, 'def area(s: Shape): Int32')
+  })
+
+  test('Hovering on area()-call should show doc', async () => {
+    const position = new vscode.Position(18, 12)
+    await testHoverAtPosition(
+      position,
+      'Computes the area of the given shape using pattern matching and basic arithmetic.',
+    )
+  })
+})
diff --git a/test/src/util.ts b/test/src/util.ts
new file mode 100644
index 00000000..23a3ff00
--- /dev/null
+++ b/test/src/util.ts
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2024 Holger Dal Mogensen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as path from 'path'
+import * as vscode from 'vscode'
+
+/**
+ * Activates the extension in the `testWorkspace` directory and opens the document at `docUri`.
+ */
+export async function activate(docUri: vscode.Uri) {
+  // The extensionId is `publisher.name` from package.json
+  const ext = vscode.extensions.getExtension('flix.flix')
+  if (ext === undefined) {
+    throw new Error('Failed to activate extension')
+  }
+
+  // This includes the time it takes for the compiler to download
+  // The time it takes for the compiler to start will be awaited in the first command sent to the extension
+  await ext.activate()
+
+  const doc = await vscode.workspace.openTextDocument(docUri)
+  await vscode.window.showTextDocument(doc)
+}
+
+function getTestDocPath(p: string) {
+  return path.resolve(__dirname, '../testWorkspace', p)
+}
+export function getTestDocUri(p: string) {
+  return vscode.Uri.file(getTestDocPath(p))
+}
diff --git a/test/testWorkspace/flix.toml b/test/testWorkspace/flix.toml
new file mode 100644
index 00000000..ea478ce3
--- /dev/null
+++ b/test/testWorkspace/flix.toml
@@ -0,0 +1,12 @@
+[package]
+name        = "vscode-flix-test"
+description = "test"
+version     = "0.1.0"
+flix        = "0.44.0"
+authors     = ["John Doe <john@example.com>"]
+
+[dependencies]
+"github:flix/museum" = "1.4.0"
+
+[mvn-dependencies]
+"org.apache.commons:commons-lang3" = "3.12.0"
diff --git a/test/testWorkspace/src/Main.flix b/test/testWorkspace/src/Main.flix
new file mode 100644
index 00000000..020ecce6
--- /dev/null
+++ b/test/testWorkspace/src/Main.flix
@@ -0,0 +1,19 @@
+
+/// An algebraic data type for shapes.
+enum Shape {
+    case Circle(Int32),          // circle radius
+    case Square(Int32),          // side length
+    case Rectangle(Int32, Int32) // height and width
+}
+
+/// Computes the area of the given shape using
+/// pattern matching and basic arithmetic.
+def area(s: Shape): Int32 = match s {
+    case Shape.Circle(r)       => 3 * (r * r)
+    case Shape.Square(w)       => w * w
+    case Shape.Rectangle(h, w) => h * w
+}
+
+// Computes the area of a 2 by 4.
+def main(): Unit \ IO =
+    println(area(Shape.Rectangle(2, 4)))
diff --git a/test/tsconfig.json b/test/tsconfig.json
new file mode 100644
index 00000000..434f2f80
--- /dev/null
+++ b/test/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "out",
+    "rootDir": "src"
+  },
+  "include": ["src"]
+}
diff --git a/tsconfig.json b/tsconfig.json
index ca0be088..30380d76 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,7 +2,7 @@
   "compilerOptions": {
     "module": "commonjs",
     "target": "es2019",
-    "lib": ["ES2019"],
+    "lib": ["ES2022"],
     "outDir": "out",
     "rootDir": "src",
     "sourceMap": true