Add:创建 flutter go web 版

packages/flutter_web/test/rendering/paragraph_intrinsics_test.dart

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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_web/rendering.dart';
+import '../flutter_test_alternative.dart';
+
+void main() {
+  test('list body and paragraph intrinsics', () {
+    final RenderParagraph paragraph = RenderParagraph(
+      const TextSpan(
+        style: TextStyle(height: 1.0),
+        text: 'Hello World',
+      ),
+      textDirection: TextDirection.ltr,
+    );
+    final RenderListBody testBlock = RenderListBody(
+      children: <RenderBox>[
+        paragraph,
+      ],
+    );
+
+    final double textWidth = paragraph.getMaxIntrinsicWidth(double.infinity);
+    final double oneLineTextHeight =
+        paragraph.getMinIntrinsicHeight(double.infinity);
+    final double constrainedWidth = textWidth * 0.9;
+    final double wrappedTextWidth =
+        paragraph.getMinIntrinsicWidth(double.infinity);
+    final double twoLinesTextHeight =
+        paragraph.getMinIntrinsicHeight(constrainedWidth);
+    final double manyLinesTextHeight = paragraph.getMinIntrinsicHeight(0.0);
+
+    // paragraph
+    expect(wrappedTextWidth, greaterThan(0.0));
+    expect(wrappedTextWidth, lessThan(textWidth));
+    expect(oneLineTextHeight, lessThan(twoLinesTextHeight));
+    expect(twoLinesTextHeight, lessThan(oneLineTextHeight * 3.0));
+    expect(manyLinesTextHeight, greaterThan(twoLinesTextHeight));
+    expect(paragraph.getMaxIntrinsicHeight(double.infinity),
+        equals(oneLineTextHeight));
+    expect(paragraph.getMaxIntrinsicHeight(constrainedWidth),
+        equals(twoLinesTextHeight));
+    expect(paragraph.getMaxIntrinsicHeight(0.0), equals(manyLinesTextHeight));
+
+    // vertical block (same expectations)
+    expect(testBlock.getMinIntrinsicWidth(double.infinity),
+        equals(wrappedTextWidth));
+    expect(testBlock.getMaxIntrinsicWidth(double.infinity), equals(textWidth));
+    expect(testBlock.getMinIntrinsicHeight(double.infinity),
+        equals(oneLineTextHeight));
+    expect(testBlock.getMinIntrinsicHeight(constrainedWidth),
+        equals(twoLinesTextHeight));
+    expect(testBlock.getMaxIntrinsicHeight(double.infinity),
+        equals(oneLineTextHeight));
+    expect(testBlock.getMaxIntrinsicHeight(constrainedWidth),
+        equals(twoLinesTextHeight));
+    expect(testBlock.getMinIntrinsicWidth(0.0), equals(wrappedTextWidth));
+    expect(testBlock.getMaxIntrinsicWidth(0.0), equals(textWidth));
+    expect(testBlock.getMinIntrinsicHeight(wrappedTextWidth),
+        equals(twoLinesTextHeight));
+    expect(testBlock.getMaxIntrinsicHeight(wrappedTextWidth),
+        equals(twoLinesTextHeight));
+    expect(testBlock.getMinIntrinsicHeight(0.0), equals(manyLinesTextHeight));
+    expect(testBlock.getMaxIntrinsicHeight(0.0), equals(manyLinesTextHeight));
+
+    // horizontal block (same expectations again)
+    testBlock.axisDirection = AxisDirection.right;
+    expect(testBlock.getMinIntrinsicWidth(double.infinity),
+        equals(wrappedTextWidth));
+    expect(testBlock.getMaxIntrinsicWidth(double.infinity), equals(textWidth));
+    expect(testBlock.getMinIntrinsicHeight(double.infinity),
+        equals(oneLineTextHeight));
+    expect(testBlock.getMinIntrinsicHeight(constrainedWidth),
+        equals(twoLinesTextHeight));
+    expect(testBlock.getMaxIntrinsicHeight(double.infinity),
+        equals(oneLineTextHeight));
+    expect(testBlock.getMaxIntrinsicHeight(constrainedWidth),
+        equals(twoLinesTextHeight));
+    expect(testBlock.getMinIntrinsicWidth(0.0), equals(wrappedTextWidth));
+    expect(testBlock.getMaxIntrinsicWidth(0.0), equals(textWidth));
+    expect(testBlock.getMinIntrinsicHeight(wrappedTextWidth),
+        equals(twoLinesTextHeight));
+    expect(testBlock.getMaxIntrinsicHeight(wrappedTextWidth),
+        equals(twoLinesTextHeight));
+    expect(testBlock.getMinIntrinsicHeight(0.0), equals(manyLinesTextHeight));
+    expect(testBlock.getMaxIntrinsicHeight(0.0), equals(manyLinesTextHeight));
+  });
+}