test: improve path tests

This commit adds new tests, executes tests for other platforms
instead of limiting platform-specific tests to those platforms,
and fixes a few style/formatting inconsistencies.

PR-URL: #5123
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-path-parse-format.js

@@ -35,7 +35,17 @@ var unixPaths = [
   '.\\file',
   './file',
   'C:\\foo',
-  ''
+  '/',
+  '',
+  '.',
+  '..',
+  '/foo',
+  '/foo.',
+  '/foo.bar',
+  '/.',
+  '/.foo',
+  '/.foo.bar',
+  '/foo/bar.baz',
 ];
 
 var unixSpecialCaseFormatTests = [
@@ -76,6 +86,67 @@ checkErrors(path.posix);
 checkFormat(path.win32, winSpecialCaseFormatTests);
 checkFormat(path.posix, unixSpecialCaseFormatTests);
 
+// Test removal of trailing path separators
+const trailingTests = [
+  [ path.win32.parse,
+    [['.\\', { root: '', dir: '', base: '.', ext: '', name: '.' }],
+     ['\\\\', { root: '\\', dir: '\\', base: '', ext: '', name: '' }],
+     ['\\\\', { root: '\\', dir: '\\', base: '', ext: '', name: '' }],
+     ['c:\\foo\\\\\\',
+      { root: 'c:\\', dir: 'c:\\', base: 'foo', ext: '', name: 'foo' }],
+     ['D:\\foo\\\\\\bar.baz',
+      { root: 'D:\\',
+        dir: 'D:\\foo\\\\',
+        base: 'bar.baz',
+        ext: '.baz',
+        name: 'bar'
+      }
+     ]
+    ]
+  ],
+  [ path.posix.parse,
+    [['./', { root: '', dir: '', base: '.', ext: '', name: '.' }],
+     ['//', { root: '/', dir: '/', base: '', ext: '', name: '' }],
+     ['///', { root: '/', dir: '/', base: '', ext: '', name: '' }],
+     ['/foo///', { root: '/', dir: '/', base: 'foo', ext: '', name: 'foo' }],
+     ['/foo///bar.baz',
+      { root: '/', dir: '/foo//', base: 'bar.baz', ext: '.baz', name: 'bar' }
+     ]
+    ]
+  ]
+];
+const failures = [];
+trailingTests.forEach(function(test) {
+  const parse = test[0];
+  test[1].forEach(function(test) {
+    const actual = parse(test[0]);
+    const expected = test[1];
+    const fn = 'path.' +
+               (parse === path.win32.parse ? 'win32' : 'posix') +
+               '.parse(';
+    const message = fn +
+                    JSON.stringify(test[0]) +
+                    ')' +
+                    '\n  expect=' + JSON.stringify(expected) +
+                    '\n  actual=' + JSON.stringify(actual);
+    const actualKeys = Object.keys(actual);
+    const expectedKeys = Object.keys(expected);
+    let failed = (actualKeys.length !== expectedKeys.length);
+    if (!failed) {
+      for (let i = 0; i < actualKeys.length; ++i) {
+        const key = actualKeys[i];
+        if (expectedKeys.indexOf(key) === -1 || actual[key] !== expected[key]) {
+          failed = true;
+          break;
+        }
+      }
+    }
+    if (failed)
+      failures.push('\n' + message);
+  });
+});
+assert.equal(failures.length, 0, failures.join(''));
+
 function checkErrors(path) {
   errors.forEach(function(errorCase) {
     try {

test/parallel/test-path-zero-length-strings.js

@@ -12,17 +12,21 @@ const pwd = process.cwd();
 
 // join will internally ignore all the zero-length strings and it will return
 // '.' if the joined string is a zero-length string.
-assert.equal(path.join(''), '.');
-assert.equal(path.join('', ''), '.');
+assert.equal(path.posix.join(''), '.');
+assert.equal(path.posix.join('', ''), '.');
+assert.equal(path.win32.join(''), '.');
+assert.equal(path.win32.join('', ''), '.');
 assert.equal(path.join(pwd), pwd);
 assert.equal(path.join(pwd, ''), pwd);
 
 // normalize will return '.' if the input is a zero-length string
-assert.equal(path.normalize(''), '.');
+assert.equal(path.posix.normalize(''), '.');
+assert.equal(path.win32.normalize(''), '.');
 assert.equal(path.normalize(pwd), pwd);
 
 // Since '' is not a valid path in any of the common environments, return false
-assert.equal(path.isAbsolute(''), false);
+assert.equal(path.posix.isAbsolute(''), false);
+assert.equal(path.win32.isAbsolute(''), false);
 
 // resolve, internally ignores all the zero-length strings and returns the
 // current working directory