Started adding tests for fields.

Author: awhitford

test/fields/form_builder_switch_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_form_builder/flutter_form_builder.dart';
+import 'form_builder_tester.dart';
+
+void main() {
+  testWidgets('FormBuilderSwitch -- Off/On/Off', (WidgetTester tester) async {
+    const switchName = 'switch1';
+    final testWidget = FormBuilderSwitch(
+      name: switchName,
+      title: const Text('Switch 1'),
+      initialValue: false,
+    );
+    final widgetFinder = find.byWidget(testWidget);
+
+    await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+
+    expect(formSave(), isTrue);
+    expect(formValue(switchName), isFalse);
+    await tester.tap(widgetFinder);
+    await tester.pumpAndSettle();
+    expect(formSave(), isTrue);
+    expect(formValue(switchName), isTrue);
+    await tester.tap(widgetFinder);
+    await tester.pumpAndSettle();
+    expect(formSave(), isTrue);
+    expect(formValue(switchName), isFalse);
+  });
+}

test/fields/form_builder_tester.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_form_builder/flutter_form_builder.dart';
+
+final _formKey = GlobalKey<FormBuilderState>();
+
+Widget buildTestableFieldWidget(Widget widget) {
+  return MaterialApp(
+    home: Scaffold(
+      body: FormBuilder(
+        key: _formKey,
+        child: widget,
+      ),
+    ),
+  );
+}
+
+bool formSave() => _formKey.currentState.saveAndValidate();
+dynamic formValue(String name) => _formKey.currentState.value[name];

test/fields/form_builder_text_field_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_form_builder/flutter_form_builder.dart';
+
+import 'form_builder_tester.dart';
+
+void main() {
+  testWidgets('FormBuilderTextField -- Hello Planet',
+      (WidgetTester tester) async {
+    const newTextValue = 'Hello 🪐';
+    const textFieldName = 'text1';
+    final testWidget = FormBuilderTextField(
+      name: textFieldName,
+    );
+    final widgetFinder = find.byWidget(testWidget);
+
+    await tester.pumpWidget(buildTestableFieldWidget(testWidget));
+    expect(formSave(), isTrue);
+    // TODO Confirm that this should not be isEmpty
+    expect(formValue(textFieldName), isNull);
+    await tester.enterText(widgetFinder, newTextValue);
+    expect(formSave(), isTrue);
+    expect(formValue(textFieldName), equals(newTextValue));
+    await tester.enterText(widgetFinder, '');
+    expect(formSave(), isTrue);
+    expect(formValue(textFieldName), isEmpty);
+  });
+}