[PATCH 6/7] tools/rtla: Add test engine support for unexpected output

[Crystal Wood <crwood@redhat.com>]

Add a check() parameter to indicate which text must not appear in the
output.

Simplify the code so that we can print failures as they happen rather
than trying to figure out what went wrong after printing "not ok".  This
also means that "not ok" gets printed after the info rather than before,
which seems more intuitive anyway.

Signed-off-by: Crystal Wood <crwood@redhat.com>
---
 tools/tracing/rtla/tests/engine.sh | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/tools/tracing/rtla/tests/engine.sh b/tools/tracing/rtla/tests/engine.sh
index a97d644ead99..25cf0822eee5 100644
--- a/tools/tracing/rtla/tests/engine.sh
+++ b/tools/tracing/rtla/tests/engine.sh
@@ -43,6 +43,7 @@ check() {
 	tested_command=$1
 	expected_exitcode=${3:-0}
 	expected_output=$4
+	unexpected_output=$5
 	# Simple check: run rtla with given arguments and test exit code.
 	# If TEST_COUNT is set, run the test. Otherwise, just count.
 	ctr=$(($ctr + 1))
@@ -53,24 +54,29 @@ check() {
 		# Run rtla; in case of failure, include its output as comment
 		# in the test results.
 		result=$(eval stdbuf -oL $TIMEOUT "$RTLA" $2 2>&1); exitcode=$?
+		fail=0
+
 		# Test if the results matches if requested
-		if [ -n "$expected_output" ]
+		if [ -n "$expected_output" ] && ! grep -qE "$expected_output" <<< "$result"
 		then
-			grep -E "$expected_output" <<< "$result" > /dev/null; grep_result=$?
-		else
-			grep_result=0
+			fail=1
+			printf "# Output match failed: \"%s\"\n" "$expected_output"
 		fi
 
-		if [ $exitcode -eq $expected_exitcode ] && [ $grep_result -eq 0 ]
+		if [ -n "$unexpected_output" ] && grep -qE "$unexpected_output" <<< "$result"
+		then
+			fail=1
+			printf "# Output non-match failed: \"%s\"\n" "$unexpected_output"
+		fi
+
+		if [ $exitcode -eq $expected_exitcode ] && [ $fail -eq 0 ]
 		then
 			echo "ok $ctr - $1"
 		else
-			echo "not ok $ctr - $1"
 			# Add rtla output and exit code as comments in case of failure
 			echo "$result" | col -b | while read line; do echo "# $line"; done
 			printf "#\n# exit code %s\n" $exitcode
-			[ -n "$expected_output" ] && [ $grep_result -ne 0 ] && \
-				printf "# Output match failed: \"%s\"\n" "$expected_output"
+			echo "not ok $ctr - $1"
 		fi
 	fi
 }
-- 
2.48.1