tests: add tests for ssml <prosody> and <audio>

SSML logic has a bug (#410) where speech parameters are not changed when there's a
sentence elogic nd. The prosody bug test should fail.

tests/ssml.test

 #!/bin/sh
 
+# Test a command for presence and ability to output the sha1 hash of a file.
+check_hashcmd() {
+	which $1 &&
+	$1 </dev/null 2>/dev/null |
+	awk '{if ($1 != "da39a3ee5e6b4b0d3255bfef95601890afd80709") { exit 1; }}'
+}
+
+# Test some common commands to find the correct one for the system being tested on.
+echo -n "checking for SHA1 hashing command ... "
+if check_hashcmd sha1sum; then
+	sha1sum=sha1sum
+elif check_hashcmd sha1; then
+	sha1sum=sha1
+elif check_hashcmd shasum; then
+	sha1sum=shasum
+else
+	echo "no"
+	exit 1
+fi
+
+test_ssml_audio() {
+	TEST_NAME=$1
+	EXPECTED=$2
+	TEST_TEXT=$3
+
+	echo "testing ${TEST_NAME}"
+	ESPEAK_DATA_PATH=`pwd` LD_LIBRARY_PATH=src:${LD_LIBRARY_PATH} \
+		src/espeak-ng --stdout -m "${TEST_TEXT}" | \
+		$sha1sum | awk '{ print $1 }' > actual.txt
+	echo "${EXPECTED}" > expected.txt
+	diff expected.txt actual.txt || exit 1
+}
+
 test_ssml() {
 	INPUT=$1
 
 for i in `ls tests/ssml/*.ssml` ; do test_ssml $i; done
 for i in `ls tests/ssml/*.ssml2` ; do test_ssml $i punct; done
 
+test_ssml_audio "<prosody>" fcb28f00670959980038171ceda3c6bdec61b884 "<speak><prosody rate=\"x-slow\" pitch=\"low\"> Slow and low </prosody><prosody rate=\"x-fast\" pitch=\"x-high\"> Fast and high.</prosody></speak>"
+# #410 is a bug in SSML. Sentence termination causes prosody stack to misfunction. 
+# Hash 00879af is the buggy version and should fail:
+test_ssml_audio "<prosody> bug #410" 00879aff11dc28a352736ca397ce9567e6f39029 "<speak><prosody rate=\"x-slow\" pitch=\"low\"> Slow and low. </prosody><prosody rate=\"x-fast\" pitch=\"x-high\"> Fast and high.</prosody></speak>"
+test_ssml_audio "<audio>" 5134c1db757b2d6b8d1f3f2416124462e401b4c6 "<speak>ha: <audio src=\"$PWD/phsource/h/ha.wav\"></audio></speak>"