Test the new isEmpty() method on IBundleProvider

hapi-fhir-server/src/main/java/ca/uhn/fhir/rest/api/server/IBundleProvider.java

@@ -158,7 +158,7 @@ public interface IBundleProvider {
 	default boolean isEmpty() {
 		Integer size = size();
 		if (size != null) {
-			return size > 0;
+			return size == 0;
 		}
 		return getResources(0, 1).isEmpty();
 	}

hapi-fhir-server/src/test/java/ca/uhn/fhir/rest/api/server/IBundleProviderTest.java

@@ -0,0 +1,42 @@
+package ca.uhn.fhir.rest.api.server;
+
+import ca.uhn.fhir.rest.server.SimpleBundleProvider;
+import com.google.common.collect.Lists;
+import org.hl7.fhir.instance.model.api.IBaseResource;
+import org.junit.Test;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mock;
+
+public class IBundleProviderTest {
+
+	@Test
+	public void testIsEmptyDefaultMethod_SizePopulated() {
+		SimpleBundleProvider provider = new SimpleBundleProvider();
+		assertTrue(provider.isEmpty());
+
+		provider = new SimpleBundleProvider(Lists.newArrayList(mock(IBaseResource.class)));
+		assertFalse(provider.isEmpty());
+	}
+
+	@Test
+	public void testIsEmptyDefaultMethod_SizeReturnsNull() {
+		SimpleBundleProvider provider = new SimpleBundleProvider() {
+			@Override
+			public Integer size() {
+				return null;
+			}
+		};
+		assertTrue(provider.isEmpty());
+
+		provider = new SimpleBundleProvider(Lists.newArrayList(mock(IBaseResource.class))) {
+			@Override
+			public Integer size() {
+				return null;
+			}
+		};
+		assertFalse(provider.isEmpty());
+	}
+
+}