[libpng15] Added test-pngstest.sh

test-pngstest.sh

+#!/bin/sh
+#
+# Run the simplified API tests
+err=0
+
+echo >> pngtest-log.txt
+echo "============ pngstest.sh ==============" >> pngtest-log.txt
+
+echo "Running test-pngstest.sh on contrib/pngsuite/*.png"
+for opts in "" "--background"
+do
+   if ./pngstest --log "$@" $opts ${srcdir}/contrib/pngsuite/*.png \
+      >>pngtest-log.txt 2>&1
+   then
+      echo "  PASS: pngstest $opts"
+   else
+      echo "  FAIL: pngstest $opts"
+      err=1
+   fi
+done
+   
+exit $err