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-rwxr-xr-xtest/ppmhist.test18
1 files changed, 17 insertions, 1 deletions
diff --git a/test/ppmhist.test b/test/ppmhist.test
index 27d31562..c17bab5a 100755
--- a/test/ppmhist.test
+++ b/test/ppmhist.test
@@ -2,11 +2,15 @@
 # This script tests: ppmhist
 # Also requires: pgmramp pamtopnm pbmmake pamseq ppmpat
 
+echo "Test 1"
+
 pgmramp -maxval=8 -lr 8 2 | ppmhist -sort=rgb -noheader
 ppmhist -map -sort=rgb -noheader testimg.ppm | pamtopnm | cksum
 
 # Test summary header
 
+echo "Test 2"
+
 pbmmake -b 2 1 | ppmhist   | head -n1
 pbmmake -w 2 1 | ppmhist   | head -n1
 pbmmake -g 2 1 | ppmhist   | head -n1
@@ -19,4 +23,16 @@ ppmpat -madras --color=rgb:32/0d/b7,rgb:31/58/a3,rgb:e9/5e/d4 25 25 | \
 ppmpat -madras --color=rgb:00/00/00,rgb:31/58/a3,rgb:e9/5e/d4 25 25 | \
   ppmhist | head -n1
 ppmpat -madras --color=rgb:00/00/00,rgb:31/58/a3,rgb:ff/ff/ff 25 25 | \
-  ppmhist | head -n1
\ No newline at end of file
+  ppmhist | head -n1
+
+echo "Test 3"
+
+echo 1>&2
+echo "Invalid command-line argument combinations." 1>&2
+echo "Error messages should appear below the line." 1>&2
+echo "-----------------------------------------------------------" 1>&2
+
+ppmhist -hexcolor -float testimg.ppm || echo "Expected failure 1"
+ppmhist -hexcolor -map   testimg.ppm || echo "Expected failure 2"
+ppmhist -float    -map   testimg.ppm || echo "Expected failure 3"
+