diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 44c9d68c03d..19fde709184 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -260,6 +260,14 @@ jobs:
       if: "matrix.use_coverage"
       run: python -m coverage xml
 
+    - name: Test with tox (in CI)
+      run: |
+        if [ "$CI" = "true" ]; then
+          tox -- --junitxml=junit.xml -o junit_family=legacy
+        else
+          tox
+        fi
+
     - name: Upload coverage to Codecov
       if: "matrix.use_coverage"
       uses: codecov/codecov-action@v5
@@ -268,6 +276,14 @@ jobs:
         files: ./coverage.xml
         verbose: true
 
+    - name: Upload test results to Codecov
+      if: ${{ !cancelled() }}
+      uses: codecov/test-results-action@v1
+      with:
+        fail_ci_if_error: false
+        files: ./junit.xml
+        verbose: true
+
   check:  # This job does nothing and is only used for the branch protection
     if: always()
 
diff --git a/changelog/12689.contrib.rst b/changelog/12689.contrib.rst
new file mode 100644
index 00000000000..837bdab9140
--- /dev/null
+++ b/changelog/12689.contrib.rst
@@ -0,0 +1 @@
+Upload JUnit test reports to Codecov to enable test result visibility in the Codecov UI.
diff --git a/testing/test_config.py b/testing/test_config.py
index bb08c40fef4..c6b6b1e3632 100644
--- a/testing/test_config.py
+++ b/testing/test_config.py
@@ -2021,8 +2021,12 @@ def test_override_ini_does_not_contain_paths(
     ) -> None:
         """Check that -o no longer swallows all options after it (#3103)"""
         config = _config_for_test
-        config._preparse(["-o", "cache_dir=/cache", "/some/test/path"])
-        assert config._override_ini == ["cache_dir=/cache"]
+        config._preparse(
+            ["-o", "cache_dir=/cache", "-o", "junit_family=legacy", "/some/test/path"]
+        )
+        assert sorted(set(config._override_ini)) == sorted(
+            ["cache_dir=/cache", "junit_family=legacy"]
+        )
 
     def test_multiple_override_ini_options(self, pytester: Pytester) -> None:
         """Ensure a file path following a '-o' option does not generate an error (#3103)"""