1 files changed, 38 insertions, 0 deletions
diff --git a/src/main/java/org/junit/internal/SerializableValueDescription.java b/src/main/java/org/junit/internal/SerializableValueDescription.java
new file mode 100644
index 0000000..4d055d7
--- /dev/null
+++ b/src/main/java/org/junit/internal/SerializableValueDescription.java
@@ -0,0 +1,38 @@
+package org.junit.internal;
+
+import java.io.Serializable;
+
+/**
+ * This class exists solely to provide a serializable description of a value to be serialized as a field in
+ * {@link AssumptionViolatedException}. Being a {@link Throwable}, it is required to be {@link Serializable}, but a
+ * value of type Object provides no guarantee to be serializable. This class works around that limitation as
+ * {@link AssumptionViolatedException} only every uses the string representation of the value, while still retaining
+ * backwards compatibility with classes compiled against its class signature before 4.14 and/or deserialization of
+ * previously serialized instances.
+ */
+class SerializableValueDescription implements Serializable {
+    private final String value;
+
+    private SerializableValueDescription(Object value) {
+        this.value = String.valueOf(value);
+    }
+
+    /**
+     * Factory method that checks to see if the value is already serializable.
+     * @param value the value to make serializable
+     * @return The provided value if it is null or already serializable,
+     * the SerializableValueDescription representation of it if it is not.
+     */
+    static Object asSerializableValue(Object value) {
+        if (value == null || value instanceof Serializable) {
+            return value;
+        } else {
+            return new SerializableValueDescription(value);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return value;
+    }
+}