Add tests

Signed-off-by: Daniel Widdis <[email protected]>

src/test/java/org/opensearch/flowframework/exception/FlowFrameworkExceptionTests.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+package org.opensearch.flowframework.exception;
+
+import org.opensearch.ExceptionsHelper;
+import org.opensearch.OpenSearchException;
+import org.opensearch.common.io.stream.BytesStreamOutput;
+import org.opensearch.common.xcontent.json.JsonXContent;
+import org.opensearch.core.common.bytes.BytesReference;
+import org.opensearch.core.common.io.stream.BytesStreamInput;
+import org.opensearch.core.rest.RestStatus;
+import org.opensearch.core.xcontent.ToXContent;
+import org.opensearch.core.xcontent.XContentBuilder;
+import org.opensearch.test.OpenSearchTestCase;
+
+import java.io.IOException;
+
+public class FlowFrameworkExceptionTests extends OpenSearchTestCase {
+
+    public void testExceptions() {
+        WorkflowStepException wse = new WorkflowStepException("WSE", RestStatus.OK);
+        assertTrue(wse instanceof FlowFrameworkException);
+        assertTrue(wse instanceof OpenSearchException);
+        assertEquals(RestStatus.OK, ExceptionsHelper.status(wse));
+        assertFalse(wse.isFragment());
+    }
+
+    public void testSerialize() throws IOException {
+        FlowFrameworkException ffe = new FlowFrameworkException("FFE", RestStatus.OK);
+        assertTrue(ffe instanceof OpenSearchException);
+        assertEquals(RestStatus.OK, ExceptionsHelper.status(ffe));
+
+        try (BytesStreamOutput out = new BytesStreamOutput()) {
+            ffe.writeTo(out);
+            try (BytesStreamInput in = new BytesStreamInput(BytesReference.toBytes(out.bytes()))) {
+                ffe = new FlowFrameworkException(in);
+                assertTrue(ffe instanceof OpenSearchException);
+                assertEquals(RestStatus.OK, ExceptionsHelper.status(ffe));
+            }
+        }
+
+        XContentBuilder builder = JsonXContent.contentBuilder();
+        assertEquals("{\"error\":\"FFE\"}", ffe.toXContent(builder, ToXContent.EMPTY_PARAMS).toString());
+    }
+}