test: handle missing V8 tests in n-api test

The N-API test testInstanceOf.js relies on several V8 test files which may not exist in downloadable archives. If the files are missing, this commit causes a warning to be emitted rather than failing the test. Refs: #14113Fixes: #13344 PR-URL: #14123 Reviewed-By: Daniel Bevenius <[email protected]> Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Michael Dawson <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: cjihrig

test/addons-napi/test_general/testInstanceOf.js

@@ -9,6 +9,11 @@ const assert = require('assert');
 constaddon=require(`./build/${common.buildType}/test_general`);
 constpath=require('path');
 
+// This test depends on a number of V8 tests.
+constv8TestsDir=path.resolve(__dirname,'..','..','..','deps','v8',
+'test','mjsunit');
+constv8TestsDirExists=fs.existsSync(v8TestsDir);
+
 // The following assert functions are referenced by v8's unit tests
 // See for instance deps/v8/test/mjsunit/instanceof.js
 // eslint-disable-next-line no-unused-vars
@@ -34,19 +39,22 @@ function assertThrows(statement){
 }
 
 functiontestFile(fileName){
-constcontents=fs.readFileSync(fileName,{encoding: 'utf8'});
-eval(contents.replace(/[(]([^\s(]+)\s+instanceof\s+([^)]+)[)]/g,
-'(addon.doInstanceOf($1, $2))'));
+try{
+constcontents=fs.readFileSync(fileName,{encoding: 'utf8'});
+eval(contents.replace(/[(]([^\s(]+)\s+instanceof\s+([^)]+)[)]/g,
+'(addon.doInstanceOf($1, $2))'));
+}catch(err){
+// This test depends on V8 test files, which may not exist in downloaded
+// archives. Emit a warning if the tests cannot be found instead of failing.
+if(err.code==='ENOENT'&&!v8TestsDirExists)
+process.emitWarning(`test file ${fileName} does not exist.`);
+else
+throwerr;
+}
 }
 
-testFile(
-path.join(path.resolve(__dirname,'..','..','..',
-'deps','v8','test','mjsunit'),
-'instanceof.js'));
-testFile(
-path.join(path.resolve(__dirname,'..','..','..',
-'deps','v8','test','mjsunit'),
-'instanceof-2.js'));
+testFile(path.join(v8TestsDir,'instanceof.js'));
+testFile(path.join(v8TestsDir,'instanceof-2.js'));
 
 // We can only perform this test if we have a working Symbol.hasInstance
 if(typeofSymbol!=='undefined'&&'hasInstance'inSymbol&&