1 files changed, 12 insertions, 0 deletions
diff --git a/test/ppmchange-roundtrip.test b/test/ppmchange-roundtrip.test
new file mode 100755
index 00000000..78f5b548
--- /dev/null
+++ b/test/ppmchange-roundtrip.test
@@ -0,0 +1,12 @@
+#! /bin/bash
+# This script tests: ppmchange
+# Also requires: pgmtopbm pnminvert ppmtopgm
+
+
+ppmchange black white white black testgrid.pbm | \
+pnminvert | ppmtopgm | \
+pgmtopbm -th -val=0.5 | cksum
+
+ppmchange  black white white black testgrid.pbm | \
+ppmchange  black white white black | \
+ppmtopgm | pgmtopbm -th -val=0.5 | cksum