Try putting it in the work dir

Author: StanFromIreland

.github/workflows/test.yml

@@ -49,4 +49,11 @@ jobs:
         pip install -e .
 
     - name: Run tests
+      if: runner.os != 'Windows'
       run: python -m unittest -v
+
+    - name: Run tests (Windows)
+      if: runner.os == 'Windows'
+      run: |
+        Copy-Item "libiconv\x64\Release\libiconv.dll" "iconv.dll"
+        python -m unittest -v