[PATCH 1/2] rtla/timerlat: Add tests for option parsing with attached arguments

[John Kacur <jkacur@redhat.com>]

Add tests to verify that numeric arguments work correctly with both
attached and detached formats:
  -p 100        (short with space)
  -p100         (short without space)
  --period=100  (long with =)
  --period 100  (long with space)

These tests prevent regression of the bug fixed in commit eefa8af46ff7
("rtla/timerlat: Fix parsing of short options with attached arguments")
where -p100 was incorrectly parsed as multiple separate options.

The tests verify that:
1. All four argument formats succeed (exit code 0)
2. None trigger the "no-irq and no-thread" error that occurred when
   the bug was present

Assisted-by: Claude:claude-sonnet-4-5
Signed-off-by: John Kacur <jkacur@redhat.com>
---
 tools/tracing/rtla/tests/timerlat.t | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/tracing/rtla/tests/timerlat.t b/tools/tracing/rtla/tests/timerlat.t
index fd4935fd7b49..1a63301f5d70 100644
--- a/tools/tracing/rtla/tests/timerlat.t
+++ b/tools/tracing/rtla/tests/timerlat.t
@@ -42,6 +42,16 @@ check "verify -c/--cpus" \
 check "hist test in nanoseconds" \
 	"timerlat hist -i 2 -c 0 -n -d 10s" 2 "ns"
 
+# Option parsing tests - verify attached numeric arguments work correctly
+check "verify -p with space" \
+	"timerlat hist -p 100 -c 0 -d 1s" 0 "" "no-irq and no-thread"
+check "verify -p without space (attached argument)" \
+	"timerlat hist -p100 -c 0 -d 1s" 0 "" "no-irq and no-thread"
+check "verify --period with equals" \
+	"timerlat hist --period=100 -c 0 -d 1s" 0 "" "no-irq and no-thread"
+check "verify --period with space" \
+	"timerlat hist --period 100 -c 0 -d 1s" 0 "" "no-irq and no-thread"
+
 # Actions tests
 check "trace output through -t" \
 	"timerlat hist -T 2 -t" 2 "^  Saving trace to timerlat_trace.txt$"
-- 
2.54.0