flashrom_tester: Fix unit test error

Commit 065366d (flashrom_tester: Change timestamp to UTC microsecond)
changed the time format, breaking the unit test. This patch
fixes the unit test.

BUG=None
BRANCH=None
TEST=cargo test

Change-Id: Iba42a9026b41ddb61bb704aa1c26783cd251d787
Signed-off-by: Evan Benn <evanbenn@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/69765
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
---
M util/flashrom_tester/src/logger.rs
1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/util/flashrom_tester/src/logger.rs b/util/flashrom_tester/src/logger.rs
index fb26bde..b700c19 100644
--- a/util/flashrom_tester/src/logger.rs
+++ b/util/flashrom_tester/src/logger.rs
@@ -153,9 +153,10 @@
 
         assert_eq!(&buf[..5], "\x1b[35m");
         // Time is difficult to test, assume it's formatted okay
+        // Split on the UTC timezone char
         assert_eq!(
-            &buf[24..],
-            " \x1b[33m[ INFO ]\x1b[0m Test message at INFO\n"
+            buf.split_once("Z ").unwrap().1,
+            "\x1b[33m[ INFO ]\x1b[0m Test message at INFO\n"
         );
     }
 

