add export bundle testing to GitHub Actions CI

- Fix classpath separator in ExportCommand to use File.pathSeparator
  instead of hardcoded ":" so desktop export works on Windows
- Upload CLI distribution as artifact from build job
- Add test-export matrix job (ubuntu, windows, macos) that verifies
  both web and desktop export commands produce expected outputs

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

Author: dwursteisen

.github/workflows/build.yml

@@ -48,6 +48,60 @@ jobs:
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./tiny-doc/build/docs/asciidoc
+      - name: Upload CLI distribution
+        uses: actions/upload-artifact@v4
+        with:
+          name: tiny-cli-dist
+          path: tiny-cli/build/distributions/tiny-cli-${{github.ref_name}}.zip
+          retention-days: 1
+
+  test-export:
+    needs: build
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    steps:
+      - name: Checkout the repo
+        uses: actions/checkout@v3
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: 17
+          distribution: 'zulu'
+      - name: Download CLI distribution
+        uses: actions/download-artifact@v4
+        with:
+          name: tiny-cli-dist
+      - name: Extract CLI distribution (Unix)
+        if: runner.os != 'Windows'
+        run: unzip tiny-cli-${{github.ref_name}}.zip
+      - name: Extract CLI distribution (Windows)
+        if: runner.os == 'Windows'
+        run: Expand-Archive -Path tiny-cli-${{github.ref_name}}.zip -DestinationPath .
+      - name: Test web export (Unix)
+        if: runner.os != 'Windows'
+        run: |
+          tiny-cli-${{github.ref_name}}/bin/tiny-cli export tiny-sample
+          test -f tiny-sample/tiny-export.zip
+      - name: Test web export (Windows)
+        if: runner.os == 'Windows'
+        run: |
+          tiny-cli-${{github.ref_name}}\bin\tiny-cli.bat export tiny-sample
+          if (-Not (Test-Path tiny-sample\tiny-export.zip)) { exit 1 }
+      - name: Test desktop export (Unix)
+        if: runner.os != 'Windows'
+        run: |
+          tiny-cli-${{github.ref_name}}/bin/tiny-cli export tiny-sample -p desktop --exclude-jdk
+          test -d exported-game
+          ls exported-game/*.jar
+      - name: Test desktop export (Windows)
+        if: runner.os == 'Windows'
+        run: |
+          tiny-cli-${{github.ref_name}}\bin\tiny-cli.bat export tiny-sample -p desktop --exclude-jdk
+          if (-Not (Test-Path exported-game)) { exit 1 }
+          if (-Not (Get-ChildItem exported-game\*.jar)) { exit 1 }
 
 env:
   GRADLE_OPTS: -Dorg.gradle.configureondemand=true -Dorg.gradle.parallel=true -Dkotlin.incremental=false -Dorg.gradle.jvmargs="-Xmx3g -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8"

tiny-cli/src/main/kotlin/com/github/minigdx/tiny/cli/command/ExportCommand.kt

@@ -422,7 +422,7 @@ class ExportCommand : CliktCommand(name = "export") {
 
     private fun getDependencies(): List<String> {
         val classPath = System.getProperty("java.class.path")
-        return classPath.split(":")
+        return classPath.split(File.pathSeparator)
             .filter { it.endsWith(".jar") }
             .filter { !it.contains("tiny-cli-") } // Exclude the CLI jar as it's already copied
             .distinct()