[PATCH olang] tests: fix diff error output

[Carlos Maniero <carlos@maniero.me>]

When passing the expected file instead of the actual file as first
argument on the diff, it provides a more clear output. Given that the
application returned a new line that the test was not expecting it was
returning the follow output:

- new line (in red)

When it is easier to understand the error when it shows as:

+ new line (in green)

Signed-off-by: Carlos Maniero <carlos@maniero.me>
---
 tests/olc/run.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/olc/run.sh b/tests/olc/run.sh
index 529f0f5..503f960 100755
--- a/tests/olc/run.sh
+++ b/tests/olc/run.sh
@@ -108,7 +108,7 @@ diff_output() {
   fi
 
   print_failed "match failed"
-  diff "$actual_file" "$expected_file" -u --color
+  diff "$expected_file" "$actual_file" -u --color
   exit 1
 }
 

base-commit: 75cfabf7da32ae460c6ecb4d4a705f4705fc2c86
-- 
2.34.1