en: add replacement rule tests

tests/language-replace.test

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+test_replace() {
+	TEST_LANG=$1
+	TEST_TEXT=$2
+
+	echo "testing ${TEST_LANG}"
+	ESPEAK_DATA_PATH=`pwd` LD_LIBRARY_PATH=src:${LD_LIBRARY_PATH} \
+		src/espeak-ng -Xq -v ${TEST_LANG} "${TEST_TEXT}" | grep -P "(Translate|Found:) " | sed -e 's/ \[.*][ ]*$//g' > actual.txt
+	diff expected.txt actual.txt || exit 1
+}
+
+##### English
+
+cat > expected.txt <<EOF
+Translate 'aeon'
+Found: 'mediaeval'
+Translate 'oeconomy'
+Found: 'phoenix'
+EOF
+test_replace en "Æon mediæval. Œconomy phœnix."
+