From 6b2494424fc8e6c49d6816294b5df5b1fe7f4c74 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Mon, 17 Dec 2018 17:11:30 -0500
Subject: tests.sh: Add a --help with usage information

---
 tests.sh | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/tests.sh b/tests.sh
index 35f0224..4afe094 100755
--- a/tests.sh
+++ b/tests.sh
@@ -606,6 +606,36 @@ bfs_tests=(
     test_deep_strict
 )
 
+function usage() {
+    local pad=$(printf "%*s" ${#0} "")
+    cat <<EOF
+Usage: $0 [--bfs=path/to/bfs] [--posix|--bsd|--gnu|--all]
+       $pad [--noclean] [--update] [--verbose] [--help]
+       $pad [test_* [test_* ...]]
+
+  --bfs=path/to/bfs
+      Set the path to the bfs executable to test (default: ./bfs)
+
+  --posix|--bsd|--gnu|--all
+      Restrict the set of test cases to run
+
+  --noclean
+      Keep the test directories around after the run
+
+  --update
+      Update the expected outputs for the test cases
+
+  --verbose
+      Log the commands that get executed
+
+  --help
+      This message
+
+  test_*
+      Select individual test cases to run
+EOF
+}
+
 BSD=yes
 GNU=yes
 ALL=yes
@@ -650,12 +680,17 @@ for arg; do
         --verbose)
             VERBOSE=yes
             ;;
+        --help)
+            usage
+            exit 0
+            ;;
         test_*)
             EXPLICIT=yes
             enable_tests "$arg"
             ;;
         *)
-            echo "Unrecognized option '$arg'." >&2
+            printf "Unrecognized option '%s'.\n\n" "$arg" >&2
+            usage >&2
             exit 1
             ;;
     esac
-- 
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