[pango] Add more markup tests

[Matthias Clasen <matthiasc src gnome org>]

commit eee80865680a946a38389f07a2fb0f3854394a8b
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Aug 15 12:34:09 2015 -0400

    Add more markup tests

 tests/markups/fail-5.expected |    1 +
 tests/markups/fail-5.markup   |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/tests/markups/fail-5.expected b/tests/markups/fail-5.expected
new file mode 100644
index 0000000..403ff7d
--- /dev/null
+++ b/tests/markups/fail-5.expected
@@ -0,0 +1 @@
+ERROR: Value of 'strikethrough_color' attribute on <span> tag on line 1 could not be parsed; should be a 
color specification, not 'rot'
\ No newline at end of file
diff --git a/tests/markups/fail-5.markup b/tests/markups/fail-5.markup
new file mode 100644
index 0000000..50e6132
--- /dev/null
+++ b/tests/markups/fail-5.markup
@@ -0,0 +1 @@
+<span strikethrough_color="rot">Text</span>