Add null check to FieldGroup.bind. (#14729)

Change-Id: I56ee44f34307d76c8c98ca3346feed8e7ee2f72e

1 files changed, 40 insertions, 0 deletions

diff --git a/server/tests/src/com/vaadin/data/fieldgroup/FieldGroupTests.java b/server/tests/src/com/vaadin/data/fieldgroup/FieldGroupTests.java
new file mode 100644
index 0000000000..eb8f21c839
--- /dev/null
+++ b/server/tests/src/com/vaadin/data/fieldgroup/FieldGroupTests.java
@@ -0,0 +1,40 @@
+package com.vaadin.data.fieldgroup;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.mockito.Mockito.mock;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import com.vaadin.ui.Field;
+
+public class FieldGroupTests {
+
+    private FieldGroup sut;
+    private Field field;
+
+    @Before
+    public void setup() {
+        sut = new FieldGroup();
+        field = mock(Field.class);
+    }
+
+    @Test
+    public void fieldIsBound() {
+        sut.bind(field, "foobar");
+
+        assertThat(sut.getField("foobar"), is(field));
+    }
+
+    @Test(expected = FieldGroup.BindException.class)
+    public void cannotBindToAlreadyBoundProperty() {
+        sut.bind(field, "foobar");
+        sut.bind(mock(Field.class), "foobar");
+    }
+
+    @Test(expected = FieldGroup.BindException.class)
+    public void cannotBindNullField() {
+        sut.bind(null, "foobar");
+    }
+}