Make Slider.clear() consistent with the no-args contstructor (#17073)

Change-Id: I3d5a5b9396bb9449a579b54ed21821415bfdae16

2 files changed, 94 insertions, 0 deletions

diff --git a/server/src/com/vaadin/ui/Slider.java b/server/src/com/vaadin/ui/Slider.java
index fab6e33cae..99e1e8d5e9 100644
--- a/server/src/com/vaadin/ui/Slider.java
+++ b/server/src/com/vaadin/ui/Slider.java
@@ -343,4 +343,14 @@ public class Slider extends AbstractField<Double> {
         return Double.class;
     }
 
+    @Override
+    public void clear() {
+        super.setValue(Double.valueOf(getState().minValue));
+    }
+
+    @Override
+    public boolean isEmpty() {
+        // Slider is never really "empty"
+        return false;
+    }
 }
diff --git a/server/tests/src/com/vaadin/tests/server/component/FieldDefaultValues.java b/server/tests/src/com/vaadin/tests/server/component/FieldDefaultValues.java
new file mode 100644
index 0000000000..5c9993e6dd
--- /dev/null
+++ b/server/tests/src/com/vaadin/tests/server/component/FieldDefaultValues.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.server.component;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.vaadin.tests.VaadinClasses;
+import com.vaadin.ui.Field;
+import com.vaadin.ui.PasswordField;
+import com.vaadin.ui.ProgressBar;
+import com.vaadin.ui.RichTextArea;
+import com.vaadin.ui.Slider;
+import com.vaadin.ui.TextArea;
+
+public class FieldDefaultValues {
+
+    @Test
+    public void testFieldsHaveDefaultValueAfterClear() throws Exception {
+        for (Field<?> field : createFields()) {
+            Object originalValue = field.getValue();
+
+            // Some fields are not initialized to the "empty" value. #17089
+            if (field instanceof PasswordField || field instanceof ProgressBar
+                    || field instanceof RichTextArea
+                    || field instanceof TextArea) {
+                originalValue = null;
+            }
+
+            field.clear();
+
+            Object clearedValue = field.getValue();
+
+            Assert.assertEquals("Expected to get default value after clearing "
+                    + field.getClass().getName(), originalValue, clearedValue);
+        }
+    }
+
+    @Test
+    public void testFieldsAreEmptyAfterClear() throws Exception {
+        for (Field<?> field : createFields()) {
+            field.clear();
+
+            if (field instanceof Slider) {
+                Assert.assertFalse(
+                        "Slider should not be empty even after being cleared",
+                        field.isEmpty());
+
+            } else {
+                Assert.assertTrue(field.getClass().getName()
+                        + " should be empty after being cleared",
+                        field.isEmpty());
+            }
+        }
+    }
+
+    @SuppressWarnings("rawtypes")
+    private static List<Field<?>> createFields() throws InstantiationException,
+            IllegalAccessException {
+        List<Field<?>> fieldInstances = new ArrayList<Field<?>>();
+
+        for (Class<? extends Field> fieldType : VaadinClasses.getFields()) {
+            fieldInstances.add(fieldType.newInstance());
+        }
+        return fieldInstances;
+    }
+
+}