Add unit test

scm-webapp/src/test/java/sonia/scm/api/v2/resources/NoBlankStringsValidatorTest.java

@@ -0,0 +1,28 @@
+package sonia.scm.api.v2.resources;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+import static java.util.Collections.emptySet;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class NoBlankStringsValidatorTest {
+
+  @Test
+  void shouldAcceptNonEmptyElements() {
+    assertTrue(new NoBlankStringsValidator().isValid(Arrays.asList("not", "empty"), null));
+  }
+
+  @Test
+  void shouldFailForEmptyElements() {
+    assertFalse(new NoBlankStringsValidator().isValid(Arrays.asList("one", "", "three"), null));
+  }
+
+  @Test
+  void shouldAcceptEmptyList() {
+    assertTrue(new NoBlankStringsValidator().isValid(emptySet(), null));
+  }
+}