Test button state

app/src/test/java/protect/card_locker/BarcodeSelectorActivityTest.java

@@ -0,0 +1,100 @@
+package protect.card_locker;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.android.controller.ActivityController;
+import org.robolectric.annotation.Config;
+
+import static org.junit.Assert.assertEquals;
+import static org.robolectric.Shadows.shadowOf;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(constants = BuildConfig.class, sdk = 23)
+public class BarcodeSelectorActivityTest {
+    @Test
+    public void emptyStateTest()
+    {
+        ActivityController activityController = Robolectric.buildActivity(BarcodeSelectorActivity.class).create();
+        activityController.start();
+        activityController.resume();
+
+        Activity activity = (Activity) activityController.get();
+
+        final TextView cardId = activity.findViewById(R.id.cardId);
+        final Button noBarcodeButton = activity.findViewById(R.id.noBarcode);
+
+        // No card ID by default
+        assertEquals(cardId.getText().toString(), "");
+
+        // Button should be visible but disabled
+        assertEquals(View.VISIBLE, noBarcodeButton.getVisibility());
+        assertEquals(false, noBarcodeButton.isEnabled());
+    }
+
+    @Test
+    public void nonEmptyStateTest() throws InterruptedException
+    {
+        ActivityController activityController = Robolectric.buildActivity(BarcodeSelectorActivity.class).create();
+        activityController.start();
+        activityController.resume();
+
+        Activity activity = (Activity) activityController.get();
+
+        final TextView cardId = activity.findViewById(R.id.cardId);
+        final Button noBarcodeButton = activity.findViewById(R.id.noBarcode);
+
+        cardId.setText("abcdefg");
+
+        activityController.pause();
+        activityController.resume();
+
+        // Button should be visible and enabled
+        assertEquals(View.VISIBLE, noBarcodeButton.getVisibility());
+        assertEquals(true, noBarcodeButton.isEnabled());
+
+        // Clicking button should create "empty" barcode
+        activity.findViewById(R.id.noBarcode).performClick();
+        Intent resultIntent = shadowOf(activity).getResultIntent();
+        assertEquals("", resultIntent.getStringExtra(BarcodeSelectorActivity.BARCODE_FORMAT));
+        assertEquals("abcdefg", resultIntent.getStringExtra(BarcodeSelectorActivity.BARCODE_CONTENTS));
+    }
+
+    @Test
+    public void nonEmptyToEmptyStateTest() throws InterruptedException
+    {
+        ActivityController activityController = Robolectric.buildActivity(BarcodeSelectorActivity.class).create();
+        activityController.start();
+        activityController.resume();
+
+        Activity activity = (Activity) activityController.get();
+
+        final TextView cardId = activity.findViewById(R.id.cardId);
+        final Button noBarcodeButton = activity.findViewById(R.id.noBarcode);
+
+        cardId.setText("abcdefg");
+
+        activityController.pause();
+        activityController.resume();
+
+        // Button should be visible and enabled
+        assertEquals(View.VISIBLE, noBarcodeButton.getVisibility());
+        assertEquals(true, noBarcodeButton.isEnabled());
+
+        cardId.setText("");
+
+        activityController.pause();
+        activityController.resume();
+
+        // Button should be visible but disabled
+        assertEquals(View.VISIBLE, noBarcodeButton.getVisibility());
+        assertEquals(false, noBarcodeButton.isEnabled());
+    }
+}