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test: add ability to skip common flag checks

Currently, `common/index.js` checks that our test files are
spawned with the flags specified in `// Flags:`, and re-spawns
with them if they are not found.

This can be *very* annoying, for example when debugging using
debuggers that attach to the parent process, or when intentionally
testing with flags that are different from the specified ones.

This adds a `NODE_SKIP_FLAG_CHECK` environment variable check.
Setting it to a non-empty value will skip the flag checks altogether.

PR-URL: #27254
Reviewed-By: Ruben Bridgewater <>
Reviewed-By: Beth Griggs <>
Reviewed-By: Colin Ihrig <>
Reviewed-By: James M Snell <>
Reviewed-By: Luigi Pinca <>
Reviewed-By: Yuta Hiroto <>
Reviewed-By: Anto Aravinth <>
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addaleax authored and ZYSzys committed Apr 16, 2019
1 parent ed89311 commit 02885dad5a7d20318fd061fdfcc593b0fe13459e
Showing with 3 additions and 1 deletion.
  1. +3 −1 test/common/index.js
@@ -51,6 +51,7 @@ const hasCrypto = Boolean(process.versions.openssl);
// If the binary was built without-ssl then the crypto flags are
// invalid (bad option). The test itself should handle this case.
if (process.argv.length === 2 &&
!process.env.NODE_SKIP_FLAG_CHECK &&
isMainThread &&
hasCrypto &&
module.parent &&
@@ -82,7 +83,8 @@ if (process.argv.length === 2 &&
(process.features.inspector || !flag.startsWith('--inspect'))) {
'NOTE: The test started as a child_process using these flags:',
'Use NODE_SKIP_FLAG_CHECK to run the test with the original flags.'
const args = [...flags, ...process.execArgv, ...process.argv.slice(1)];
const options = { encoding: 'utf8', stdio: 'inherit' };

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