Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/resolve/test/resolver/nested_symlinks/mylib/async.js

@@ -0,0 +1,26 @@
+var a = require.resolve('buffer/').replace(process.cwd(), '$CWD');
+var b;
+var c;
+
+function test() {
+    console.log(a, ': require.resolve, preserveSymlinks ' + (process.execArgv.indexOf('preserve-symlinks') > -1 ? 'true' : 'false'));
+    console.log(b, ': preserveSymlinks true');
+    console.log(c, ': preserveSymlinks false');
+
+    if (a !== b && a !== c) {
+        throw 'async: no match';
+    }
+    console.log('async: success! a matched either b or c\n');
+}
+
+require('resolve')('buffer/', { preserveSymlinks: true }, function (err, result) {
+    if (err) { throw err; }
+    b = result.replace(process.cwd(), '$CWD');
+    if (b && c) { test(); }
+});
+require('resolve')('buffer/', { preserveSymlinks: false }, function (err, result) {
+    if (err) { throw err; }
+    c = result.replace(process.cwd(), '$CWD');
+    if (b && c) { test(); }
+});
+