1 files changed, 33 insertions, 0 deletions
diff --git a/src/main/java/org/junit/validator/PublicClassValidator.java b/src/main/java/org/junit/validator/PublicClassValidator.java
new file mode 100644
index 0000000..fe3f185
--- /dev/null
+++ b/src/main/java/org/junit/validator/PublicClassValidator.java
@@ -0,0 +1,33 @@
+package org.junit.validator;
+
+import static java.util.Collections.emptyList;
+import static java.util.Collections.singletonList;
+
+import java.util.List;
+
+import org.junit.runners.model.TestClass;
+
+/**
+ * Validates that a {@link TestClass} is public.
+ * 
+ * @since 4.12
+ */
+public class PublicClassValidator implements TestClassValidator {
+    private static final List<Exception> NO_VALIDATION_ERRORS = emptyList();
+
+    /**
+     * Validate that the specified {@link TestClass} is public.
+     * 
+     * @param testClass the {@link TestClass} that is validated.
+     * @return an empty list if the class is public or a list with a single
+     *         exception otherwise.
+     */
+    public List<Exception> validateTestClass(TestClass testClass) {
+        if (testClass.isPublic()) {
+            return NO_VALIDATION_ERRORS;
+        } else {
+            return singletonList(new Exception("The class "
+                    + testClass.getName() + " is not public."));
+        }
+    }
+}