add toast on empty name

- show toast if the board name is empty
- add test for NewBoardActivity

app/src/androidTest/java/it/unisannio/ding/ids/wedroid/app/view/NewBoardActivityTest.kt

@@ -0,0 +1,37 @@
+package it.unisannio.ding.ids.wedroid.app.view
+
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.RootMatchers.withDecorView
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.espresso.matcher.ViewMatchers.withText
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.LargeTest
+import androidx.test.rule.ActivityTestRule
+import it.unisannio.ding.ids.wedroid.app.R
+import org.hamcrest.core.IsNot.not
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+@LargeTest
+class NewBoardActivityTest {
+
+    @get:Rule
+    val activityRule = ActivityTestRule(NewBoardActivity::class.java)
+
+    @Test
+    fun showToastOnEmptyName() {
+        onView(withId(R.id.newBoardDone))
+            .perform(click())
+
+        onView(withText(R.string.on_add_new_board_empty_name))
+            .inRoot(withDecorView(not(activityRule.activity.window.decorView)))
+            .check(matches(isDisplayed()))
+    }
+
+}
+

app/src/main/java/it/unisannio/ding/ids/wedroid/app/view/NewBoardActivity.java

@@ -9,6 +9,7 @@ import androidx.appcompat.widget.Toolbar;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.Switch;
+import android.widget.Toast;
 
 import it.unisannio.ding.ids.wedroid.app.R;
 
@@ -28,6 +29,12 @@ public class NewBoardActivity extends AppCompatActivity {
     }
 
     public void onDone(View v) {
+        if (boardName.getText().toString().equals("")) {
+            Toast.makeText(this, R.string.on_add_new_board_empty_name, Toast.LENGTH_LONG)
+                    .show();
+            return;
+        }
+
         Intent data = new Intent();
         data.putExtra(BOARD_NAME, boardName.getText().toString());
         data.putExtra(BOARD_PRIVATE, isPrivate.isChecked());

app/src/main/res/values/strings.xml

@@ -8,4 +8,5 @@
     <string name="new_board_done_button">Done</string>
     <string name="on_null_new_board_name">There was a problem with the name of the new board</string>
     <string name="on_add_new_board_error">It was not possible to add a new board</string>
+    <string name="on_add_new_board_empty_name">Name cannot be empty</string>
 </resources>