<p><b>@ghubstan</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/3134#discussion_r317364107">desktop/src/test/java/bisq/desktop/util/validation/PhoneNumberValidatorTest.java</a>:</p>
<pre style='color:#555'>> +import static org.junit.Assert.assertTrue;
+
+public class PhoneNumberValidatorTest {
+    private PhoneNumberValidator validator;
+    private ValidationResult validationResult;
+
+    @Before
+    public void setup() {
+        Res.setup();
+    }
+
+    @Test
+    public void testNoInput() {
+        validator = new PhoneNumberValidator("AT");
+        validationResult = validator.validate("");
+        assertFalse("'' should not be a valid number in AT", validationResult.isValid);
</pre>
<p>I didn't create a custom assertion; I think test names and framework's existing assertions are sufficient.</p>

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