diff --git a/.github/workflows/run-tests.yaml b/.github/workflows/run-tests.yaml
index 8d28c8a..00cd7c7 100644
--- a/.github/workflows/run-tests.yaml
+++ b/.github/workflows/run-tests.yaml
@@ -54,9 +54,18 @@ jobs:
           name: test-results
           path: '**/build/test-results/test*/TESTS-TestSuites.xml'
 
-      - name: Send test coverage to Coveralls.io
+      - name: Send Java backend test coverage to Coveralls.io
         uses: coverallsapp/github-action@v2
         if: always()
         with:
           # The .xml file only contains paths relative to this one.
           base-path: 'strcalc/src/main/java'
+          file: 'strcalc/build/reports/jacoco/jacocoXmlTestReport/jacocoXmlTestReport.xml'
+
+      - name: Send JavaScript frontend test coverage to Coveralls.io
+        uses: coverallsapp/github-action@v2
+        if: always()
+        with:
+          # The lcov file only contains paths relative to this one.
+          base-path: 'strcalc/src/main/frontend'
+          file: 'strcalc/build/reports/frontend/coverage/lcov.info'
diff --git a/strcalc/build.gradle.kts b/strcalc/build.gradle.kts
index 3267c00..cbdce0b 100644
--- a/strcalc/build.gradle.kts
+++ b/strcalc/build.gradle.kts
@@ -73,6 +73,7 @@ val smallTests = tasks.named<Test>("test") {
 }
 val testClasses = tasks.named("testClasses")
 val pnpmBuild = tasks.named("pnpm_build")
+val pnpmTestCi = tasks.named("pnpm_test-ci")
 val war = tasks.named("war")
 
 tasks.war {
@@ -106,7 +107,7 @@ val mediumCoverageTests = tasks.register<Test>("test-medium-coverage") {
     setLargerTestOptions(this)
     dependsOn(pnpmBuild)
     useJUnitPlatform { includeTags("medium & coverage") }
-    shouldRunAfter(smallTests)
+    shouldRunAfter(smallTests, pnpmTestCi)
 }
 
 val mediumTests = tasks.register<Test>("test-medium") {
@@ -114,7 +115,7 @@ val mediumTests = tasks.register<Test>("test-medium") {
     setLargerTestOptions(this)
     dependsOn(pnpmBuild)
     useJUnitPlatform { includeTags("medium & !coverage") }
-    shouldRunAfter(smallTests, mediumCoverageTests)
+    shouldRunAfter(smallTests, mediumCoverageTests, pnpmTestCi)
     extensions.configure(JacocoTaskExtension::class) {
         isEnabled = false
     }
@@ -125,7 +126,7 @@ val largeTests = tasks.register<Test>("test-large") {
     setLargerTestOptions(this)
     dependsOn(war)
     useJUnitPlatform { includeTags("large") }
-    shouldRunAfter(mediumCoverageTests, mediumTests)
+    shouldRunAfter(mediumCoverageTests, mediumTests, pnpmTestCi)
     extensions.configure(JacocoTaskExtension::class) {
         isEnabled = false
     }
@@ -138,7 +139,7 @@ val allTestSizes = arrayOf(
 val allTests = tasks.register<Task>("test-all") {
     description = "Runs the small, medium, and large test suites in order."
     group = "verification"
-    dependsOn(allTestSizes)
+    dependsOn(pnpmTestCi, allTestSizes)
 }
 
 internal val testResultsDir = java.testResultsDir
@@ -154,6 +155,11 @@ val relativeToRootDir = fun(absPath: java.nio.file.Path): java.nio.file.Path {
 // - https://docs.gradle.org/current/userguide/ant.html
 val mergeTestReports = fun(resultsDir: File) {
     val taskName = resultsDir.name
+
+    // The `pnpm_test-ci` output is already merged. Trying to merge it again
+    // results in an empty file, so skip it.
+    if (taskName == "test-frontend") return
+
     val relResultsDir = relativeToRootDir(resultsDir.toPath())
     val reportTaskName = "merged-report-$taskName"
 
diff --git a/strcalc/src/main/frontend/package.json b/strcalc/src/main/frontend/package.json
index b459c16..5fbc86f 100644
--- a/strcalc/src/main/frontend/package.json
+++ b/strcalc/src/main/frontend/package.json
@@ -9,8 +9,9 @@
     "preview": "vite preview",
     "lint": "eslint --color --max-warnings 0 .",
     "test": "vitest",
-    "test:run": "vitest --run",
-    "test:ui": "vitest --ui",
+    "test-run": "vitest run",
+    "test-ui": "vitest --ui --coverage",
+    "test-ci": "vitest run --coverage --reporter=junit --reporter=default",
     "coverage": "vitest run --coverage"
   },
   "devDependencies": {
diff --git a/strcalc/src/main/frontend/vite.config.js b/strcalc/src/main/frontend/vite.config.js
index 5f8a415..e857194 100644
--- a/strcalc/src/main/frontend/vite.config.js
+++ b/strcalc/src/main/frontend/vite.config.js
@@ -1,6 +1,14 @@
+const BUILD_DIR = '../../../build/'
 export default {
   base: '/strcalc',
   build: {
-    outDir: '../../../build/webapp'
+    outDir: BUILD_DIR + 'webapp'
+  },
+  test: {
+    outputFile: BUILD_DIR + 'test-results/test-frontend/TESTS-TestSuites.xml',
+    coverage: {
+      reporter: ['text', 'html', 'lcov'],
+      reportsDirectory: BUILD_DIR + 'reports/frontend/coverage'
+    }
   }
 }