Fix bug and add test (#669)

+tests/+unit/dynamicTableTest.m

@@ -99,6 +99,36 @@ function testToTableForNdVectorData(testCase)
     end
 end
 
+function testToTableForTableImportedFromFile(testCase)
+    fileName = "testToTableForTableImportedFromFile.nwb";
+
+    nwb = NwbFile( ...
+        'session_description', 'test file for nwb export', ...
+        'identifier', 'export_test', ...
+        'session_start_time', datetime("now", 'TimeZone', 'local') );
+
+    numTableRows = 10;
+
+    dynamicTable = types.hdmf_common.DynamicTable( ...
+            'description', 'test table with n-dimensional VectorData', ...
+            'colnames', {'columnA', 'columnB'}, ...
+            'columnA', types.hdmf_common.VectorData(...
+                'description', 'first_column', ...
+                'data', randi(10, [1, numTableRows])), ...
+            'columnB', types.hdmf_common.VectorData(...
+                'description', 'second_column', ...
+                'data', randi(10, [1, numTableRows])), ...
+            'id', types.hdmf_common.ElementIdentifiers('data', (0:numTableRows-1)'  ) );
+
+    nwb.acquisition.set('DynamicTable', dynamicTable);
+    nwbExport(nwb, fileName)
+
+    nwbIn = nwbRead(fileName);
+
+    T = nwbIn.acquisition.get('DynamicTable').toTable();
+    testCase.verifyClass(T, 'table')
+end
+
 
 % Non-test functions
 function dtr_table = createDynamicTableWithTableRegionReferences()

+types/+util/+dynamictable/nwbToTable.m

@@ -85,7 +85,8 @@
     'columns', remainingColumns ...
 )];
 
-% Update the columns order to be the same as the original 
+% Update the columns order to be the same as the original
+if iscolumn(columns); columns = transpose(columns); end
 matlabTable = matlabTable(:, [{'id'}, columns]);
 
 % Add variable descriptions