Add implementations for Headers, Request, Response and dart:io/dart:html clients to http_base

dart/pkg/http_base/test/http_base_test.dart

+library http_base.http_base_test;
+
+import 'package:http_base/http_base.dart';
+import 'package:unittest/unittest.dart';
+
+main() {
+  group('headers-impl', () {
+    test('empty', () {
+      for (HeadersImpl emptyHeaders in [HeadersImpl.Empty,
+                                        new HeadersImpl({})]) {
+        expect(emptyHeaders.names, isEmpty);
+        expect(emptyHeaders['foo'], isNull);
+        expect(emptyHeaders.getMultiple('foo'), isNull);
+      }
+    });
+
+    test('multi-value', () {
+      var headers = new HeadersImpl({
+        'Single' : 'single-value',
+        'Mul' : ['mul-1', 'mul-2', 'mul-3,mul-4'],
+        'Mul-Inline' : 'mi-1,mi-2,mi-3',
+      });
+
+      expect(headers.names, hasLength(3));
+      expect(headers.names, contains('single'));
+      expect(headers.names, contains('mul'));
+      expect(headers.names, contains('mul-inline'));
+
+      for (var key in ['Single', 'single']) {
+        expect(headers[key], equals('single-value'));
+        expect(headers.getMultiple(key), equals(['single-value']));
+      }
+
+      for (var key in ['Mul', 'mul']) {
+        expect(headers[key], equals('mul-1,mul-2,mul-3,mul-4'));
+        expect(headers.getMultiple(key),
+               equals(['mul-1','mul-2','mul-3','mul-4']));
+      }
+
+      for (var key in ['Mul-Inline', 'mul-inline']) {
+        expect(headers[key], equals('mi-1,mi-2,mi-3'));
+        expect(headers.getMultiple(key), equals(['mi-1','mi-2','mi-3']));
+      }
+    });
+
+    test('cookie-headers', () {
+      var headers = new HeadersImpl({
+        'Set-Cookie' : [
+            'lang=en-US; Expires=Wed, 09 Jun 2021 10:18:14 GMT',
+            'lang=de-DE; Expires=Wed, 09 Jun 2021 10:18:14 GMT',],
+        'Cookie' : ['name1=value1; name2=value2', 'name3=value3'],
+      });
+
+      expect(() => headers['set-cookie'], throwsArgumentError);
+      expect(() => headers['cookie'], throwsArgumentError);
+
+      expect(headers.getMultiple('set-cookie').toList(), equals([
+          'lang=en-US; Expires=Wed, 09 Jun 2021 10:18:14 GMT',
+          'lang=de-DE; Expires=Wed, 09 Jun 2021 10:18:14 GMT']));
+
+      expect(headers.getMultiple('cookie').toList(),
+             equals(['name1=value1; name2=value2', 'name3=value3']));
+    });
+
+    test('replace', () {
+      var headers = new HeadersImpl({
+        'Single' : 'single-value',
+        'Mul' : ['mul-1', 'mul-2', 'mul-3,mul-4'],
+        'Mul-Inline' : 'mi-1,mi-2,mi-3',
+      }).replace({
+        'single' : 'foo',
+        'mul' : null,
+        'mul-inline' : 'bar',
+      });
+
+      expect(headers.names, hasLength(2));
+      expect(headers['single'], equals('foo'));
+      expect(headers['mul-inline'], equals('bar'));
+    });
+  });
+}