test: add test for loading from global folders

Test executes with a copy of the node executable since $PREFIX/lib/node
is relative to the executable location.
PR-URL: #9283
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: João Reis <reis@janeasystems.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Author: richardlau

test/fixtures/test-module-loading-globalpaths/home-pkg-in-both/.node_libraries/foo.js

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+exports.string='$HOME/.node_libraries';

test/fixtures/test-module-loading-globalpaths/home-pkg-in-both/.node_modules/foo.js

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+exports.string='$HOME/.node_libraries';

test/fixtures/test-module-loading-globalpaths/home-pkg-in-node_libraries/.node_libraries/foo.js

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+'use strict';
+console.log(require('foo').string);

test/fixtures/test-module-loading-globalpaths/home-pkg-in-node_modules/.node_modules/foo.js

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+exports.string='$NODE_PATH';

test/fixtures/test-module-loading-globalpaths/local-pkg/node_modules/foo.js

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+'use strict';
+constcommon=require('../common');
+constassert=require('assert');
+constpath=require('path');
+constfs=require('fs');
+constchild_process=require('child_process');
+constpkgName='foo';
+
+if(process.argv[2]==='child'){
+console.log(require(pkgName).string);
+}else{
+common.refreshTmpDir();
+
+// Copy node binary into a test $PREFIX directory.
+constprefixPath=path.join(common.tmpDir,'install');
+fs.mkdirSync(prefixPath);
+lettestExecPath;
+if(common.isWindows){
+testExecPath=path.join(prefixPath,path.basename(process.execPath));
+}else{
+constprefixBinPath=path.join(prefixPath,'bin');
+fs.mkdirSync(prefixBinPath);
+testExecPath=path.join(prefixBinPath,path.basename(process.execPath));
+}
+constmode=fs.statSync(process.execPath).mode;
+fs.writeFileSync(testExecPath,fs.readFileSync(process.execPath));
+fs.chmodSync(testExecPath,mode);
+
+construnTest=(expectedString,env)=>{
+constchild=child_process.execFileSync(testExecPath,
+[__filename,'child'],
+{encoding: 'utf8',env: env});
+assert.strictEqual(child.trim(),expectedString);
+};
+
+consttestFixturesDir=path.join(common.fixturesDir,
+path.basename(__filename,'.js'));
+
+constenv=Object.assign({},process.env);
+// Turn on module debug to aid diagnosing failures.
+env['NODE_DEBUG']='module';
+// Unset NODE_PATH.
+deleteenv['NODE_PATH'];
+
+// Test empty global path.
+constnoPkgHomeDir=path.join(common.tmpDir,'home-no-pkg');
+fs.mkdirSync(noPkgHomeDir);
+env['HOME']=env['USERPROFILE']=noPkgHomeDir;
+assert.throws(
+()=>{
+child_process.execFileSync(testExecPath,[__filename,'child'],
+{encoding: 'utf8',env: env});
+},
+newRegExp('Cannot find module \''+pkgName+'\''));
+
+// Test module in $HOME/.node_modules.
+constmodHomeDir=path.join(testFixturesDir,'home-pkg-in-node_modules');
+env['HOME']=env['USERPROFILE']=modHomeDir;
+runTest('$HOME/.node_modules',env);
+
+// Test module in $HOME/.node_libraries.
+constlibHomeDir=path.join(testFixturesDir,'home-pkg-in-node_libraries');
+env['HOME']=env['USERPROFILE']=libHomeDir;
+runTest('$HOME/.node_libraries',env);
+
+// Test module both $HOME/.node_modules and $HOME/.node_libraries.
+constbothHomeDir=path.join(testFixturesDir,'home-pkg-in-both');
+env['HOME']=env['USERPROFILE']=bothHomeDir;
+runTest('$HOME/.node_modules',env);
+
+// Test module in $PREFIX/lib/node.
+// Write module into $PREFIX/lib/node.
+constexpectedString='$PREFIX/lib/node';
+constprefixLibPath=path.join(prefixPath,'lib');
+fs.mkdirSync(prefixLibPath);
+constprefixLibNodePath=path.join(prefixLibPath,'node');
+fs.mkdirSync(prefixLibNodePath);
+constpkgPath=path.join(prefixLibNodePath,pkgName+'.js');
+fs.writeFileSync(pkgPath,'exports.string = \''+expectedString+'\';');
+
+env['HOME']=env['USERPROFILE']=noPkgHomeDir;
+runTest(expectedString,env);
+
+// Test module in all global folders.
+env['HOME']=env['USERPROFILE']=bothHomeDir;
+runTest('$HOME/.node_modules',env);
+
+// Test module in NODE_PATH is loaded ahead of global folders.
+env['HOME']=env['USERPROFILE']=bothHomeDir;
+env['NODE_PATH']=path.join(testFixturesDir,'node_path');
+runTest('$NODE_PATH',env);
+
+// Test module in local folder is loaded ahead of global folders.
+constlocalDir=path.join(testFixturesDir,'local-pkg');
+env['HOME']=env['USERPROFILE']=bothHomeDir;
+env['NODE_PATH']=path.join(testFixturesDir,'node_path');
+constchild=child_process.execFileSync(testExecPath,
+[path.join(localDir,'test.js')],
+{encoding: 'utf8',env: env});
+assert.strictEqual(child.trim(),'local');
+}