diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3dd2cbb..c42e85b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -79,8 +79,8 @@ jobs:
       - name: test
         run: |
           cd test
-          python actions-test1.py -o actions-test1-${{ runner.os }}-${{ matrix.csound-branch }}.wav
+          python actions-test1.py -o actions-test1-${{ runner.os }}-${{ matrix.csound-branch }}.flac
 
-      #- uses: actions/upload-artifact@v3
-      #  with:
-      #    path: test/*.wav
+      - uses: actions/upload-artifact@v3
+        with:
+          path: test/*.flac
diff --git a/test/actions-test1.py b/test/actions-test1.py
index e785746..0511b5f 100644
--- a/test/actions-test1.py
+++ b/test/actions-test1.py
@@ -1,5 +1,6 @@
 import ctcsound7 as ct
 import argparse
+import os
 
 parser = argparse.ArgumentParser()
 parser.add_argument('-o', '--outfile', default='test.wav')
@@ -9,6 +10,17 @@
 cs = ct.Csound()
 
 cs.setOption(f"-o{args.outfile}")
+ext = os.path.splitext(args.outfile)[1]
+if ext == '.flac':
+    cs.setOption("--format=flac")
+elif ext == '.mp3':
+    cs.setOption("--mpeg")
+elif ext == '.ogg':
+    cs.setOption("--format=ogg")
+    cs.setOption("--format=vorbis")
+else:
+    assert ext == '.wav'
+
 cs.compileOrc(r'''
 0dbfs = 1
 ksmps = 64