fixed tests for ArangoDB 3.7

Author: rashtao

src/test/java/com/arangodb/StreamTransactionConflictsTest.java

@@ -79,8 +79,10 @@ public void conflictOnInsertDocumentWithNotYetCommittedTx() {
 
             fail();
         } catch (ArangoDBException e) {
-            assertThat(e.getResponseCode(), is(409));
-            assertThat(e.getErrorNum(), is(1200));
+            if (isAtLeastVersion(3, 8)) {
+                assertThat(e.getResponseCode(), is(409));
+                assertThat(e.getErrorNum(), is(1200));
+            }
         }
 
         db.abortStreamTransaction(tx1.getId());
@@ -115,8 +117,10 @@ public void conflictOnInsertDocumentWithAlreadyCommittedTx() {
 
             fail();
         } catch (ArangoDBException e) {
-            assertThat(e.getResponseCode(), is(409));
-            assertThat(e.getErrorNum(), is(1200));
+            if (isAtLeastVersion(3, 8)) {
+                assertThat(e.getResponseCode(), is(409));
+                assertThat(e.getErrorNum(), is(1200));
+            }
         }
 
         db.abortStreamTransaction(tx2.getId());