diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0565fe1..56419f2 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,7 +33,7 @@ jobs:
             cmake --build . --parallel 4
 
           # tests are failing for unknown reasons
-        - if: matrix.os == 'ubuntu-latest'
+        - if: matrix.os != 'macos-latest'
           name: Test shared
           shell: bash
           run: cd build && ctest --output-on-failure
diff --git a/src/binary.cpp b/src/binary.cpp
index 5949dd3..d27762a 100644
--- a/src/binary.cpp
+++ b/src/binary.cpp
@@ -75,7 +75,7 @@ std::vector<unsigned char> DecodeBase64(const std::string &input) {
 
   unsigned value = 0;
   for (std::size_t i = 0, cnt = 0; i < input.size(); i++) {
-    if (std::isspace(input[i])) {
+    if (std::isspace(static_cast<unsigned char>(input[i]))) {
       // skip newlines
       continue;
     }
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 5ebc1a6..6118b7f 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -47,3 +47,10 @@ endif()
 
 
 add_test(yaml-cpp::test yaml-cpp-tests)
+
+if (build-windows-dll)
+  add_custom_command(
+    TARGET yaml-cpp-tests
+    POST_BUILD COMMAND ${CMAKE_COMMAND} -E
+    copy_if_different "$<TARGET_FILE:yaml-cpp>" "$<TARGET_FILE_DIR:yaml-cpp-tests>")
+endif()