From ae3997b382bb6074b751bdec7da4c47bfd78e648 Mon Sep 17 00:00:00 2001
From: fvogel <fvogelnew1@free.fr>
Date: Tue, 21 Nov 2017 20:35:20 +0000
Subject: Add test imgPNG-3.1 demonstrating bug [1c659ef0f1]

---
 tests/iDOT.png    | Bin 0 -> 6279 bytes
 tests/imgPNG.test |  11 +++++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 tests/iDOT.png

diff --git a/tests/iDOT.png b/tests/iDOT.png
new file mode 100644
index 0000000..e8cd024
Binary files /dev/null and b/tests/iDOT.png differ
diff --git a/tests/imgPNG.test b/tests/imgPNG.test
index 0757411..335ac39 100644
--- a/tests/imgPNG.test
+++ b/tests/imgPNG.test
@@ -1103,6 +1103,17 @@ test imgPNG-2.2 {reading a good image with multiple IDATs} -setup {
 } -cleanup {
     image delete $i
 } -result 223x212
+
+test imgPNG-3.1 {reading image with unknown ancillary chunk - bug [1c659ef0f1]} -setup {
+    set fileName [file join [file dirname [info script]] iDOT.png]
+} -body {
+    # the image contains an unknown chunk iDOT
+    # since the name of this chunk starts with a lowercase letter,
+    # it's an ancillary chunk that shall not trigger an error
+    catch {image create photo -file $fileName}
+} -cleanup {
+    catch {image delete $im}
+} -result {0}
 
 }
 namespace delete png
-- 
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