@@ -1619,4 +1619,90 @@ void main() {
16191619 expect ((mergeableMaterial.children.first as MaterialSlice ).color, firstPanelColor);
16201620 expect ((mergeableMaterial.children.last as MaterialSlice ).color, secondPanelColor);
16211621 });
1622+
1623+ testWidgets ('ExpansionPanelList.materialGapSize defaults to 16.0' , (WidgetTester tester) async {
1624+ await tester.pumpWidget (MaterialApp (
1625+ home: SingleChildScrollView (
1626+ child: ExpansionPanelList (
1627+ children: < ExpansionPanel > [
1628+ ExpansionPanel (
1629+ canTapOnHeader: true ,
1630+ body: const SizedBox .shrink (),
1631+ headerBuilder: (BuildContext context, bool isExpanded) {
1632+ return const SizedBox .shrink ();
1633+ },
1634+ )
1635+ ],
1636+ ),
1637+ ),
1638+ ));
1639+
1640+ final ExpansionPanelList expansionPanelList = tester.widget (find.byType (ExpansionPanelList ));
1641+ expect (expansionPanelList.materialGapSize, 16 );
1642+ });
1643+
1644+ testWidgets ('ExpansionPanelList respects materialGapSize' , (WidgetTester tester) async {
1645+ Widget buildWidgetForTest ({double materialGapSize = 16 }) {
1646+ return MaterialApp (
1647+ home: SingleChildScrollView (
1648+ child: ExpansionPanelList (
1649+ materialGapSize: materialGapSize,
1650+ children: < ExpansionPanel > [
1651+ ExpansionPanel (
1652+ isExpanded: true ,
1653+ canTapOnHeader: true ,
1654+ body: const SizedBox .shrink (),
1655+ headerBuilder: (BuildContext context, bool isExpanded) {
1656+ return const SizedBox .shrink ();
1657+ },
1658+ ),
1659+ ExpansionPanel (
1660+ canTapOnHeader: true ,
1661+ body: const SizedBox .shrink (),
1662+ headerBuilder: (BuildContext context, bool isExpanded) {
1663+ return const SizedBox .shrink ();
1664+ },
1665+ ),
1666+ ],
1667+ ),
1668+ ),
1669+ );
1670+ }
1671+
1672+ await tester.pumpWidget (buildWidgetForTest (materialGapSize: 0 ));
1673+ await tester.pumpAndSettle ();
1674+ final MergeableMaterial mergeableMaterial = tester.widget (find.byType (MergeableMaterial ));
1675+ expect (mergeableMaterial.children.length, 3 );
1676+ expect (mergeableMaterial.children.whereType <MaterialGap >().length, 1 );
1677+ expect (mergeableMaterial.children.whereType <MaterialSlice >().length, 2 );
1678+ for (final MergeableMaterialItem e in mergeableMaterial.children) {
1679+ if (e is MaterialGap ) {
1680+ expect (e.size, 0 );
1681+ }
1682+ }
1683+
1684+ await tester.pumpWidget (buildWidgetForTest (materialGapSize: 20 ));
1685+ await tester.pumpAndSettle ();
1686+ final MergeableMaterial mergeableMaterial2 = tester.widget (find.byType (MergeableMaterial ));
1687+ expect (mergeableMaterial2.children.length, 3 );
1688+ expect (mergeableMaterial2.children.whereType <MaterialGap >().length, 1 );
1689+ expect (mergeableMaterial2.children.whereType <MaterialSlice >().length, 2 );
1690+ for (final MergeableMaterialItem e in mergeableMaterial2.children) {
1691+ if (e is MaterialGap ) {
1692+ expect (e.size, 20 );
1693+ }
1694+ }
1695+
1696+ await tester.pumpWidget (buildWidgetForTest ());
1697+ await tester.pumpAndSettle ();
1698+ final MergeableMaterial mergeableMaterial3 = tester.widget (find.byType (MergeableMaterial ));
1699+ expect (mergeableMaterial3.children.length, 3 );
1700+ expect (mergeableMaterial3.children.whereType <MaterialGap >().length, 1 );
1701+ expect (mergeableMaterial3.children.whereType <MaterialSlice >().length, 2 );
1702+ for (final MergeableMaterialItem e in mergeableMaterial3.children) {
1703+ if (e is MaterialGap ) {
1704+ expect (e.size, 16 );
1705+ }
1706+ }
1707+ });
16221708}
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