diff --git a/engine/src/test/java/org/opencds/cqf/cql/engine/execution/CqlEngineTests.java b/engine/src/test/java/org/opencds/cqf/cql/engine/execution/CqlEngineTests.java
index a44d1b5d..e551205d 100644
--- a/engine/src/test/java/org/opencds/cqf/cql/engine/execution/CqlEngineTests.java
+++ b/engine/src/test/java/org/opencds/cqf/cql/engine/execution/CqlEngineTests.java
@@ -5,9 +5,10 @@ import static org.hamcrest.Matchers.is;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 
-
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
 import java.io.StringWriter;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
@@ -42,20 +43,37 @@ public class CqlEngineTests {
     }
 
     private Library toLibrary(String text) throws IOException, JAXBException  {
+    	return toLibrary( text, CqlTranslator.Format.XML );
+    }
+    
+    private Library toLibrary(String text, CqlTranslator.Format format) throws IOException, JAXBException  {
         ModelManager modelManager = new ModelManager();
         LibraryManager libraryManager = new LibraryManager(modelManager);
 
-        return this.toLibrary(text, modelManager, libraryManager);
+        return this.toLibrary(text, modelManager, libraryManager, format);
     }
 
-    private Library toLibrary(String text, ModelManager modelManager, LibraryManager libraryManager) throws IOException, JAXBException {
+    private Library toLibrary(String text, ModelManager modelManager, LibraryManager libraryManager, CqlTranslator.Format format) throws IOException, JAXBException {
         CqlTranslator translator = CqlTranslator.fromText(text, modelManager, libraryManager);
-        return this.readXml(translator.toXml());
+        switch( format ) {
+        case XML:
+        	return this.readXml(translator.toXml());
+        case JSON:
+        	return this.readJson(translator.toJson());
+        default:
+        	throw new IllegalArgumentException( String.format( "No support for format %s", format.name() ) );
+        }
     }
 
     private Library readXml(String xml) throws IOException, JAXBException {
         return CqlLibraryReader.read(new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8)));
     }
+    
+    private Library readJson(String json ) throws IOException {
+    	try( Reader r = new StringReader(json) ) {
+    		return JsonCqlLibraryReader.read(r);
+    	}
+    }
 
     private org.hl7.elm.r1.VersionedIdentifier toElmIdentifier(String name, String version) {
         return new org.hl7.elm.r1.VersionedIdentifier().withId(name).withVersion(version);
@@ -91,6 +109,22 @@ public class CqlEngineTests {
         EvaluationResult result = engine.evaluate("Test");
 
  
+        Object expResult = result.forExpression("X");
+
+        assertThat(expResult, is(10));
+    }
+    
+    @Test
+    public void test_simpleLibraryJson_returnsResult() throws IOException, JAXBException {
+        Library library = this.toLibrary("library Test version '1.0.0'\ndefine X:\n5+5", CqlTranslator.Format.JSON);
+
+        LibraryLoader libraryLoader = new InMemoryLibraryLoader(Collections.singleton(library));
+
+        CqlEngine engine = new CqlEngine(libraryLoader);
+
+        EvaluationResult result = engine.evaluate("Test");
+
+ 
         Object expResult = result.forExpression("X");
 
         assertThat(expResult, is(10));