Adding unit test to check forwarding of minIncluded/maxIncluded via sideTitles

Author: Stefan Czesla

test/chart/base/axis_chart/side_titles/side_titles_test.dart

@@ -0,0 +1,74 @@
+import 'package:fl_chart/fl_chart.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  final data = [
+    const FlSpot(0, 0.5),
+    const FlSpot(1, 1.3),
+    const FlSpot(2, 1.9),
+  ];
+
+  const viewSize = Size(400, 400);
+
+  testWidgets(
+    'Test the effect of minIncluded and maxIncluded in sideTitles',
+        (WidgetTester tester) async {
+
+      // Minimum/maximum included
+      final mima = [[true, true], [true, false], [false, true], [false, false]];
+
+      for(final e in mima) {
+
+        final titlesData = FlTitlesData(
+          leftTitles: AxisTitles(
+            sideTitles: SideTitles(
+              showTitles: true,
+              minIncluded: e[0],
+              maxIncluded: e[1],
+              reservedSize: 50,
+              interval: 1,
+            ),),
+          rightTitles: const AxisTitles(),
+          topTitles: const AxisTitles(),
+          bottomTitles: const AxisTitles(),
+        );
+
+        await tester.pumpWidget(
+          MaterialApp(
+            home: Scaffold(
+              body: Center(
+                child: SizedBox(
+                  width: viewSize.width,
+                  height: viewSize.height,
+                  child: LineChart(
+                    LineChartData(
+                      titlesData: titlesData,
+                      lineBarsData: [
+                        LineChartBarData(
+                          spots: data,
+                        ),
+                      ],
+                    ),
+                  ),
+                ),
+              ),
+            ),
+          ),
+        );
+        // Number of expected text widgets (titles) on the y-axis
+        expect(find.byType(Text), findsNWidgets((e[0] ? 1 : 0) + (e[1] ? 1 : 0) + 1));
+        // Always there
+        expect(find.text('1'), findsOneWidget);
+        if(e[0]) {
+          // Minimum included
+          expect(find.text('0.5'), findsOneWidget);
+        }
+        if(e[1]) {
+          // Maximum included
+          expect(find.text('1.9'), findsOneWidget);
+        }
+      }
+    },
+  );
+}