adding test for migrations on columns using keywords

tests/data/db_structure.xml

@@ -223,4 +223,19 @@
   </declaration>
  </table>
 
+<table>
+	<name>*dbprefix*migratekeyword</name>
+
+	<declaration>
+
+	<field>
+		<name>key</name>
+		<type>text</type>
+		<default></default>
+		<notnull>true</notnull>
+		<length>255</length>
+	</field>
+	</declaration>
+</table>
+
 </database>

tests/data/db_structure2.xml

@@ -119,4 +119,19 @@
   </declaration>
  </table>
 
+	<table>
+		<name>*dbprefix*migratekeyword</name>
+
+		<declaration>
+
+			<field>
+				<name>key</name>
+				<type>text</type>
+				<default></default>
+				<notnull>false</notnull>
+				<length>255</length>
+			</field>
+		</declaration>
+	</table>
+
 </database>