more portable usage check

test/help/check_usage.py

@@ -0,0 +1,10 @@
+import subprocess
+
+with open("../../README.md", "r") as file:
+    text_readme = file.read()
+
+text_help = subprocess.check_output(["../../bin/sv2v", "--help"]).decode()
+text_usage = "```\n" + "\n".join(text_help.split("\n")[2:-5]) + "\n```"
+
+if text_usage not in text_readme:
+    raise RuntimeError(f"'{text_usage}' not found in '{text_readme}'")

test/help/run.sh

@@ -5,14 +5,7 @@ test_help() {
     assertTrue "getting help should succeed" $result
     assertNotNull "stdout should not be empty" "$stdout"
     assertNull "stderr should be empty" "$stderr"
-    lines=`echo "$stdout" | wc -l`
-    usage=`echo "$stdout" | tail -n +3 | head -n $(expr $lines - 5)`
-    usage="\`\`\`
-$usage
-\`\`\`"
-    if [[ ! $(<../../README.md) = *"$usage"* ]]; then
-        fail "Did not find matching usage in README!"
-    fi
+    python3 check_usage.py
 }
 
 source ../lib/functions.sh