Add a password settings testcase (#1058)

* Add a simple testcase

This commit was done to understand how JUnit
and its friends are working. Expect more useful tests
in the future ;)

* Factorise a bit the tests

airsonic-main/src/test/java/org/airsonic/player/validator/PasswordSettingsValidatorTestCase.java

@@ -0,0 +1,46 @@
+package org.airsonic.player.validator;
+
+import junit.framework.TestCase;
+import org.airsonic.player.command.PasswordSettingsCommand;
+import org.junit.Before;
+import org.springframework.validation.BeanPropertyBindingResult;
+import org.springframework.validation.Errors;
+
+public class PasswordSettingsValidatorTestCase extends TestCase {
+
+    private PasswordSettingsCommand psc;
+
+    @Before
+    public void setUp() throws Exception {
+        psc = new PasswordSettingsCommand();
+        psc.setUsername("username");
+        psc.setPassword("1234");
+    }
+
+    private Errors validatePassword(){
+        PasswordSettingsValidator psv = new PasswordSettingsValidator();
+        Errors errors = new BeanPropertyBindingResult(psc, "psv");
+        psv.validate(psc, errors);
+        return  errors;
+    }
+
+    public void testValidateEmptyPassword() {
+        psc.setPassword("");
+        Errors errors = this.validatePassword();
+        assertTrue(errors.hasErrors());
+    }
+
+    public void testValidateDifferentPasswords() {
+        psc.setConfirmPassword("5678");
+
+        Errors errors = this.validatePassword();
+        assertTrue(errors.hasErrors());
+    }
+
+    public void testValidateEverythingOK() {
+        psc.setConfirmPassword("1234");
+
+        Errors errors = this.validatePassword();
+        assertFalse(errors.hasErrors());
+    }
+}