diff --git a/test_client/custom_rules.xml b/test_client/custom_rules.xml
new file mode 100644
index 00000000..965385e0
--- /dev/null
+++ b/test_client/custom_rules.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="custom_rules">
+	<target name="-pre-build" >
+		<!-- Replace OC server URL if set in environment -->
+		<if>
+			<condition>
+				<isset property="env.OCTEST_SERVER_BASE_URL" />
+			</condition>
+			<then>
+				<replaceregexp
+					file="res/values/setup.xml"
+					match='("server_base_url"&gt;)\s*(&lt;)'
+					replace="\1${env.OCTEST_SERVER_BASE_URL}\2"
+					byline="true" />
+			</then>
+		</if>
+		
+		<!-- Replace test username if set in environment -->
+		<if>
+			<condition>
+				<isset property="env.OCTEST_USERNAME" />
+			</condition>
+			<then>
+				<echo>Setting username ${env.OC_TEST_USERNAME}</echo>
+				<replaceregexp
+					file="res/values/setup.xml"
+					match='("username"&gt;)\s*(&lt;)'
+					replace="\1${env.OCTEST_USERNAME}\2"
+					byline="true" />
+			</then>
+		</if>
+				
+		<!-- Replace test username if set in environment -->
+		<if>
+			<condition>
+				<isset property="env.OCTEST_PASSWORD" />
+			</condition>
+			<then>
+				<replaceregexp
+				file="res/values/setup.xml"
+				match='("password"&gt;)\s*(&lt;)'
+				replace="\1${env.OCTEST_PASSWORD}\2"
+				byline="true" />
+			</then>
+		</if>
+	</target>
+</project>
\ No newline at end of file