Add new Yarn based test suite

This introduces a yarn which demonstrates testing tbdiff.

Also included is a shell library to assist with writing yarn based tests,
a script for running the test suite and a simple README for executing the
tests.

1 files changed, 14 insertions, 0 deletions

diff --git a/yarns/tbdiff.shell-lib b/yarns/tbdiff.shell-lib
new file mode 100644
index 0000000..658efe6
--- /dev/null
+++ b/yarns/tbdiff.shell-lib
@@ -0,0 +1,14 @@
+# Shell library for tbdiff yarns.
+#
+# The shell functions in this library are meant to make writing IMPLEMENTS
+# sections for yarn scenario tests easier.
+
+# Currently, yarn isn't setting $SRCDIR to point at the project source
+# directory.  We simulate this here.
+
+{
+    set +u
+    if [ -z "$SRCDIR" ]; then
+        export SRCDIR="$(pwd)"
+    fi
+}