Re-enable Windows unit tests

.github/workflows/main_ci.yml

@@ -63,16 +63,10 @@ jobs:
       run: |
         cmake --build "${{ env.BUILD_DIR }}" --target test
 
-## XXX(RLB): Unit tests are currently disabled on Windows because of two
-## conflicting bugs.  On the one hand, doctest has a bug that causes
-## doctest_discover_tests to fail when tests are built with sanitizers.  On the
-## other hand, if tests are not built with sanitizers, then the unit tests hang
-## in the middle of the test run.
-##
-##    - name: Unit Test (Windows)
-##      if: matrix.os == 'windows-latest'
-##      run: |
-##        cmake --build "${{ env.BUILD_DIR }}" --target RUN_TESTS
+    - name: Unit Test (Windows)
+      if: matrix.os == 'windows-latest'
+      run: |
+        cmake --build "${{ env.BUILD_DIR }}" --target RUN_TESTS
 
   interop-test:
     if: github.event.pull_request.draft == false