[Tests] add some tests for browser field

Author: ljharb

test/.eslintrc

@@ -0,0 +1,5 @@
+{
+    "rules": {
+        "max-lines": 0
+    }
+}

test/resolver.js

@@ -360,3 +360,28 @@ test('not a directory', function (t) {
         t.equal(err && err.message, 'Cannot find module \'' + path + "' from '" + __filename + "'");
     });
 });
+
+test('browser field in package.json', function (t) {
+    t.plan(3);
+
+    var dir = path.join(__dirname, 'resolver');
+    resolve(
+        './browser_field',
+        {
+            basedir: dir,
+            packageFilter: function packageFilter(pkg) {
+                if (pkg.browser) {
+                    pkg.main = pkg.browser;
+                    delete pkg.browser;
+                }
+                return pkg;
+            }
+        },
+        function (err, res, pkg) {
+            if (err) t.fail(err);
+            t.equal(res, path.join(dir, 'browser_field', 'b.js'));
+            t.equal(pkg && pkg.main, 'b');
+            t.equal(pkg && pkg.browser, undefined);
+        }
+    );
+});

test/resolver/browser_field/a.js

@@ -0,0 +1,5 @@
+{
+  "name": "browser_field",
+  "main": "a",
+  "browser": "b"
+}

test/resolver/browser_field/b.js

@@ -277,3 +277,19 @@ test('not a directory', function (t) {
     }
     t.end();
 });
+
+test('browser field in package.json', function (t) {
+    var dir = path.join(__dirname, 'resolver');
+    var res = resolve.sync('./browser_field', {
+        basedir: dir,
+        packageFilter: function packageFilter(pkg) {
+            if (pkg.browser) {
+                pkg.main = pkg.browser;
+                delete pkg.browser;
+            }
+            return pkg;
+        }
+    });
+    t.equal(res, path.join(dir, 'browser_field', 'b.js'));
+    t.end();
+});