How does this look?

Drawing the graph helped me a lot in figuring out what I was actually testing. thanks!

Brian Henderson (3):
  diff-highlight: add some tests.
  diff-highlight: add failing test for handling --graph output.
  diff-highlight: add support for --graph output.

 contrib/diff-highlight/Makefile                  |   5 +
 contrib/diff-highlight/diff-highlight            |  19 +-
 contrib/diff-highlight/t/Makefile                |  22 +++
 contrib/diff-highlight/t/t9400-diff-highlight.sh | 223 +++++++++++++++++++++++
 4 files changed, 263 insertions(+), 6 deletions(-)
 create mode 100644 contrib/diff-highlight/Makefile
 create mode 100644 contrib/diff-highlight/t/Makefile
 create mode 100755 contrib/diff-highlight/t/t9400-diff-highlight.sh

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2.9.3