fix: add compatibility with older python versions for clock::now

PEP 515 (Underscores in Numeric Literals) is supported only in Python
3.6+.

Author: pastalian

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Fix bench tests missing test_file var
+- Fix compatibility with older python versions for clock::now
 
 ## [0.25.0](https://github.com/TypedDevs/bashunit/compare/0.23.0...0.24.0) - 2025-10-05
 

src/clock.sh

@@ -76,7 +76,7 @@ function clock::now() {
     python)
       python - <<'EOF'
 import time, sys
-sys.stdout.write(str(int(time.time() * 1_000_000_000)))
+sys.stdout.write(str(int(time.time() * 1000000000)))
 EOF
       ;;
     node)