fix: don't require email address from participants under 16

src/Form/BookingParticipantType.php

@@ -209,7 +209,7 @@ class BookingParticipantType extends AbstractType
         if ($this->fieldStateProvider->shouldIncludeField('email', $bookingDto, $participantIndex)) {
             $form->add('email', EmailType::class, $this->mergeFieldState([
                 'label' => 'E-Mail',
-                'required' => !$personalDataOptional,
+                'required' => false,
                 'property_path' => 'participant.email',
                 'attr' => [
                     'autocomplete' => 'leave-me-alone-chrome',

src/Form/Model/ParticipantDto.php

@@ -12,11 +12,20 @@ use App\BusProNet\Model\Service;
 use App\Validator\Constraints as AppAssert;
 use Symfony\Component\Validator\Constraints as Assert;
 use Symfony\Component\Validator\Context\ExecutionContextInterface;
+
 use function Symfony\Component\String\u;
 
 #[AppAssert\Participant(groups: ['booking_edit', 'booking_create'])]
 class ParticipantDto
 {
+    /**
+     * Age below which a participant counts as a child.
+     *
+     * Children may share an email address with an adult and are not required to have one of
+     * their own; both rules go through isChild(), so this is the only place the age lives.
+     */
+    public const CHILD_AGE_THRESHOLD = 16;
+
     /**
      * List of dynamic participant fields that can be conditionally hidden/shown.
      */
@@ -70,8 +79,14 @@ class ParticipantDto
     #[Assert\NotNull(message: 'Bitte angeben', groups: ['strict_required'])]
     public ?\DateTimeImmutable $dateOfBirth = null;
 
+    // Requiredness is delegated to requiresOwnEmail() so the constraint and the field state
+    // conditions cannot state the rule differently.
     #[Assert\Email(message: 'Bitte eine gültige E-Mail Adresse angeben', mode: 'strict', groups: ['booking_edit', 'booking_create'])]
-    #[Assert\NotBlank(message: 'Bitte angeben', groups: ['strict_required'])]
+    #[Assert\When(
+        expression: 'this.requiresOwnEmail()',
+        constraints: [new Assert\NotBlank(message: 'Bitte angeben')],
+        groups: ['strict_required']
+    )]
     public ?string $email = null;
 
     public ?string $mobile = null;
@@ -345,11 +360,25 @@ class ParticipantDto
      * A child is defined as someone under the specified age threshold (default: 16 years).
      * This classification is used for email uniqueness validation (children can share emails with adults).
      *
-     * @param int $ageThreshold The age threshold for child classification (default: 16)
-     *
      * @return bool True if participant is under the age threshold, false otherwise or if age unknown
      */
-    public function isChild(int $ageThreshold = 16): bool
+    /**
+     * Decides whether this participant has to supply an email address of their own.
+     *
+     * The applicant is the booking's contact and always has to be reachable. Everyone else only
+     * needs an address once they are old enough to have one, so children are exempt. An unknown
+     * date of birth counts as an adult, following isChild().
+     *
+     * Single source for the rule: the Assert\When on $email enforces it, and the 'required'
+     * field state conditions in CreateFieldStateProvider/EditFieldStateProvider render the
+     * matching mandatory marker.
+     */
+    public function requiresOwnEmail(): bool
+    {
+        return $this->isApplicant() || false === $this->isChild();
+    }
+
+    public function isChild(int $ageThreshold = self::CHILD_AGE_THRESHOLD): bool
     {
         $age = $this->getAge();
 

src/Form/Service/Abstract/AbstractFieldStateProvider.php

@@ -113,7 +113,9 @@ abstract class AbstractFieldStateProvider implements FieldStateProviderInterface
      * Supported state types:
      * - 'readonly': Adds readonly HTML attribute to the field
      * - 'disabled': Disables the field completely
-     * - 'required': Makes the field mandatory
+     * - 'required': Determines whether the field is mandatory. Unlike the states above this is
+     *   authoritative in both directions: the condition result is assigned as-is, so it can also
+     *   clear a 'required' option set by the form type.
      * - 'static_text': Field should be rendered as static text (checked separately via shouldRenderAsStaticText())
      * - 'hidden': Field excluded from form entirely (checked via shouldIncludeField())
      *
@@ -137,7 +139,21 @@ abstract class AbstractFieldStateProvider implements FieldStateProviderInterface
         $attributes = [];
 
         foreach ($this->fieldStateConditions[$fieldName] as $stateType => $condition) {
-            if ($condition->evaluate($bookingDto, $participantIndex, $formData)) {
+            $isMet = $condition->evaluate($bookingDto, $participantIndex, $formData);
+
+            // 'required' is a determination the provider owns outright, so it is assigned either
+            // way and can clear the form type's base option. 'readonly' and 'disabled' are
+            // escalations: a condition can only ever switch them on, never hand back control of a
+            // field the form type deliberately locked down.
+            if ('required' === $stateType) {
+                $stateModifications['required'] = $isMet;
+                continue;
+            }
+
+            if (false === $isMet) {
+                continue;
+            }
+
             switch ($stateType) {
                 case 'readonly':
                     $attributes['readonly'] = true;
@@ -145,14 +161,10 @@ abstract class AbstractFieldStateProvider implements FieldStateProviderInterface
                 case 'disabled':
                     $stateModifications['disabled'] = true;
                     break;
-                    case 'required':
-                        $stateModifications['required'] = true;
-                        break;
                     // Note: 'static_text' and 'hidden' are intentionally not handled here
                     // They are checked via shouldRenderAsStaticText() and shouldIncludeField()
             }
         }
-        }
 
         if (false === empty($attributes)) {
             $stateModifications['attr'] = $attributes;

src/Form/Service/Condition/InternalAgencyBookingCondition.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service\Condition;
+
+use App\Form\Model\BookingDto;
+use App\Form\Service\Contract\FieldConditionInterface;
+
+/**
+ * Condition that checks whether the booking belongs to an internal agency.
+ *
+ * Internal agency bookings are made by staff on behalf of a customer, so they are exempt
+ * from several rules that protect customer-entered data: personal data stays editable and
+ * fields that are mandatory for customers may be left blank.
+ *
+ * This is the plain flag on its own. FirstParticipantReadOnlyCondition and
+ * PersonalDataMutabilityCondition also consult it, but combine it with further criteria.
+ */
+class InternalAgencyBookingCondition implements FieldConditionInterface
+{
+    /**
+     * Evaluates whether the booking is an internal agency booking.
+     *
+     * @param BookingDto           $bookingDto       The current booking data (create or edit)
+     * @param int                  $participantIndex The index of the participant being evaluated (unused)
+     * @param array<string, mixed> $formData         Current form data (unused)
+     *
+     * @return bool True if the booking was made by an internal agency
+     */
+    public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
+    {
+        return $bookingDto->isInternalAgencyBooking();
+    }
+
+    /**
+     * The agency code is a property of the booking, not of any form field.
+     *
+     * @return string[] Always empty
+     */
+    public function getDependentFields(): array
+    {
+        return [];
+    }
+
+    public function getDescription(): string
+    {
+        return 'Checks if the booking is an internal agency booking';
+    }
+}

src/Form/Service/Condition/RequiresOwnEmailCondition.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service\Condition;
+
+use App\Form\Model\BookingDto;
+use App\Form\Service\Contract\FieldConditionInterface;
+
+/**
+ * Condition that mirrors ParticipantDto::requiresOwnEmail() into the field state layer.
+ *
+ * It deliberately holds no logic of its own. The rule for who needs an email address is
+ * enforced by the Assert\When on ParticipantDto::$email; this condition exists so the
+ * mandatory marker rendered next to the field is derived from that same method rather than
+ * from a second, independently maintained composition of age and applicant conditions.
+ */
+class RequiresOwnEmailCondition implements FieldConditionInterface
+{
+    /**
+     * Evaluates whether the participant has to supply an email address of their own.
+     *
+     * @param BookingDto           $bookingDto       The current booking data (create or edit)
+     * @param int                  $participantIndex The index of the participant being evaluated
+     * @param array<string, mixed> $formData         Current form data (unused)
+     *
+     * @return bool True if the participant needs their own email address
+     */
+    public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
+    {
+        $participant = $bookingDto->getParticipant($participantIndex);
+
+        // A participant that does not exist yet is treated as needing an address, matching the
+        // "unknown counts as an adult" stance of ParticipantDto::isChild().
+        return null === $participant || $participant->requiresOwnEmail();
+    }
+
+    /**
+     * The rule reads the date of birth, so the state has to be recalculated when it changes.
+     *
+     * @return string[] Array containing 'dateOfBirth'
+     */
+    public function getDependentFields(): array
+    {
+        return ['dateOfBirth'];
+    }
+
+    public function getDescription(): string
+    {
+        return 'Checks if the participant needs an email address of their own';
+    }
+}

src/Form/Service/CreateFieldStateProvider.php

@@ -20,6 +20,7 @@ use App\Form\Service\Condition\FirstParticipantReadOnlyCondition;
 use App\Form\Service\Condition\MultipleParticipantsCondition;
 use App\Form\Service\Condition\RentalInsuranceAvailableCondition;
 use App\Form\Service\Condition\RentalSelectionCondition;
+use App\Form\Service\Condition\RequiresOwnEmailCondition;
 use App\Form\Service\Condition\RoomSelectionCondition;
 use App\Form\Service\Condition\ServiceSubTypeCondition;
 use App\Form\Service\Condition\SingleRoomTypeCondition;
@@ -113,6 +114,7 @@ class CreateFieldStateProvider extends AbstractFieldStateProvider
 
         $this->fieldStateConditions['email'] = [
             'static_text' => $firstParticipantReadOnlyCondition,
+            'required' => new RequiresOwnEmailCondition(),
         ];
 
         // Mobile field: static text for first participant (when read-only), required for first participant (guest bookings)

src/Form/Service/EditFieldStateProvider.php

@@ -7,7 +7,6 @@ namespace App\Form\Service;
 use App\BusProNet\Utility\DirectionMapper;
 use App\Form\Model\BookingDto;
 use App\Form\Service\Abstract\AbstractFieldStateProvider;
-use App\Form\Service\Contract\FieldConditionInterface;
 use App\Form\Service\Condition\AdditionalServicesMutabilityCondition;
 use App\Form\Service\Condition\AgeRangeCondition;
 use App\Form\Service\Condition\BookingModeCondition;
@@ -16,10 +15,12 @@ use App\Form\Service\Condition\DateOfBirthProvidedCondition;
 use App\Form\Service\Condition\FieldValueCondition;
 use App\Form\Service\Condition\FirstParticipantCondition;
 use App\Form\Service\Condition\FirstParticipantReadOnlyCondition;
+use App\Form\Service\Condition\InternalAgencyBookingCondition;
 use App\Form\Service\Condition\PersonalDataMutabilityCondition;
 use App\Form\Service\Condition\PickupsMutabilityCondition;
 use App\Form\Service\Condition\RentalInsuranceAvailableCondition;
 use App\Form\Service\Condition\RentalSelectionCondition;
+use App\Form\Service\Condition\RequiresOwnEmailCondition;
 use App\Form\Service\Condition\RoomSelectionCondition;
 use App\Form\Service\Condition\ServiceSubTypeCondition;
 use App\Form\Service\Condition\SkiPassSelectionCondition;
@@ -69,16 +70,8 @@ class EditFieldStateProvider extends AbstractFieldStateProvider
         // TODO: Remove the block below and move 'firstName', 'lastName', 'dateOfBirth' into the
         // 'gender'/'nationality' loop once BPN reliably handles name and date-of-birth changes for participants.
         // Until then, name and DOB are always read-only for non-internal agency regardless of the BPN flag.
-        $corePersonalDataReadOnlyCondition = new class implements FieldConditionInterface {
-            public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
-            {
-                return !$bookingDto->isInternalAgencyBooking();
-            }
-
-            public function getDependentFields(): array { return []; }
-
-            public function getDescription(): string { return 'Name and DOB always read-only for non-internal agency (temporary)'; }
-        };
+        $internalAgencyBookingCondition = new InternalAgencyBookingCondition();
+        $corePersonalDataReadOnlyCondition = CompositeCondition::not($internalAgencyBookingCondition);
         foreach (['firstName', 'lastName', 'dateOfBirth'] as $field) {
             $this->fieldStateConditions[$field] = ['static_text' => $corePersonalDataReadOnlyCondition];
         }
@@ -92,11 +85,19 @@ class EditFieldStateProvider extends AbstractFieldStateProvider
         }
 
         // Contact fields: only the applicant (index 0) is read-only — participants can always update email/phone
-        foreach (['email', 'mobile'] as $field) {
-            $this->fieldStateConditions[$field] = [
+        $this->fieldStateConditions['mobile'] = [
             'static_text' => $firstParticipantReadOnlyCondition,
         ];
-        }
+
+        // Same rule as the create flow, except that internal agency bookings leave personal
+        // data optional throughout.
+        $this->fieldStateConditions['email'] = [
+            'static_text' => $firstParticipantReadOnlyCondition,
+            'required' => CompositeCondition::and(
+                CompositeCondition::not($internalAgencyBookingCondition),
+                new RequiresOwnEmailCondition(),
+            ),
+        ];
 
         // Address fields - render as static text if first participant in non-internal agency OR participant not mutable
         $this->fieldStateConditions['address'] = [

tests/Form/Model/ParticipantDtoTest.php

@@ -204,4 +204,60 @@ class ParticipantDtoTest extends TestCase
 
         return $insurance;
     }
+
+    public function testRequiresOwnEmailIsFalseForNonApplicantChild(): void
+    {
+        $participant = new ParticipantDto();
+        $participant->index = 1;
+        $participant->dateOfBirth = new \DateTimeImmutable('2015-01-01');
+
+        $this->assertFalse($participant->requiresOwnEmail());
+    }
+
+    public function testRequiresOwnEmailIsTrueForNonApplicantAdult(): void
+    {
+        $participant = new ParticipantDto();
+        $participant->index = 1;
+        $participant->dateOfBirth = new \DateTimeImmutable('1990-01-01');
+
+        $this->assertTrue($participant->requiresOwnEmail());
+    }
+
+    public function testRequiresOwnEmailIsTrueForTheApplicantEvenAsAChild(): void
+    {
+        $participant = new ParticipantDto();
+        $participant->index = 0;
+        $participant->dateOfBirth = new \DateTimeImmutable('2015-01-01');
+
+        $this->assertTrue(
+            $participant->requiresOwnEmail(),
+            'The applicant is the booking contact and always has to be reachable'
+        );
+    }
+
+    public function testRequiresOwnEmailTreatsUnknownAgeAsAdult(): void
+    {
+        $participant = new ParticipantDto();
+        $participant->index = 1;
+        $participant->dateOfBirth = null;
+
+        $this->assertTrue($participant->requiresOwnEmail());
+    }
+
+    public function testRequiresOwnEmailBoundaryAtChildAgeThreshold(): void
+    {
+        $exactlyThreshold = new ParticipantDto();
+        $exactlyThreshold->index = 1;
+        $exactlyThreshold->dateOfBirth = (new \DateTimeImmutable('today'))
+            ->modify(sprintf('-%d years', ParticipantDto::CHILD_AGE_THRESHOLD));
+
+        $oneDayShort = new ParticipantDto();
+        $oneDayShort->index = 1;
+        $oneDayShort->dateOfBirth = (new \DateTimeImmutable('today'))
+            ->modify(sprintf('-%d years', ParticipantDto::CHILD_AGE_THRESHOLD))
+            ->modify('+1 day');
+
+        $this->assertTrue($exactlyThreshold->requiresOwnEmail());
+        $this->assertFalse($oneDayShort->requiresOwnEmail());
+    }
 }

tests/Form/Model/ParticipantEditDtoTest.php

@@ -30,6 +30,7 @@ use Symfony\Component\Validator\Constraints\Email;
 use Symfony\Component\Validator\Constraints\EmailValidator;
 use Symfony\Component\Validator\ConstraintValidatorFactoryInterface;
 use Symfony\Component\Validator\ConstraintValidatorInterface;
+use Symfony\Component\Validator\ConstraintViolationListInterface;
 use Symfony\Component\Validator\Validation;
 use Symfony\Component\Validator\Validator\ValidatorInterface;
 
@@ -856,6 +857,161 @@ class ParticipantEditDtoTest extends TestCase
      * available ski pass. Ski pass validation depends on the travel actually offering
      * passes, so a travel without them is a distinct fixture, not the default.
      */
+    public function testChildWithoutEmailPassesStrictValidation(): void
+    {
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createAdultParticipant('[email protected]'),
+            $this->createChildParticipant(''),
+        ]);
+
+        $violations = $this->validateStrict($bookingDto, 1);
+
+        $this->assertSame([], $this->emailRequiredMessages($violations));
+    }
+
+    public function testChildWithNullEmailPassesStrictValidation(): void
+    {
+        $child = $this->createChildParticipant('');
+        $child->email = null;
+
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createAdultParticipant('[email protected]'),
+            $child,
+        ]);
+
+        $violations = $this->validateStrict($bookingDto, 1);
+
+        $this->assertSame([], $this->emailRequiredMessages($violations));
+    }
+
+    public function testChildWithMalformedEmailStillFailsEmailFormatValidation(): void
+    {
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createAdultParticipant('[email protected]'),
+            $this->createChildParticipant('not-an-email'),
+        ]);
+
+        $violations = $this->validator->validate(
+            new ParticipantEditDto(
+                participant: $bookingDto->participants[1],
+                bookingContext: $bookingDto,
+            ),
+            null,
+            ['booking_create', 'strict_required']
+        );
+
+        $messages = [];
+        foreach ($violations as $violation) {
+            if ('participant.email' === $violation->getPropertyPath()) {
+                $messages[] = $violation->getMessage();
+            }
+        }
+
+        $this->assertSame(['Bitte eine gültige E-Mail Adresse angeben'], $messages);
+    }
+
+    public function testAdultDependentWithoutEmailFailsStrictValidation(): void
+    {
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createAdultParticipant('[email protected]'),
+            $this->createAdultParticipant(''),
+        ]);
+
+        $violations = $this->validateStrict($bookingDto, 1);
+
+        $this->assertSame(['Bitte angeben'], $this->emailRequiredMessages($violations));
+    }
+
+    public function testDependentWithUnknownDateOfBirthAndNoEmailFailsStrictValidation(): void
+    {
+        $participant = $this->createAdultParticipant('');
+        $participant->dateOfBirth = null;
+
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createAdultParticipant('[email protected]'),
+            $participant,
+        ]);
+
+        $violations = $this->validateStrict($bookingDto, 1);
+
+        $this->assertSame(['Bitte angeben'], $this->emailRequiredMessages($violations));
+    }
+
+    public function testApplicantChildWithoutEmailStillFailsStrictValidation(): void
+    {
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createChildParticipant(''),
+            $this->createAdultParticipant('[email protected]'),
+        ]);
+
+        $violations = $this->validateStrict($bookingDto, 0);
+
+        $this->assertSame(['Bitte angeben'], $this->emailRequiredMessages($violations));
+    }
+
+    public function testDependentTurningExactlySixteenRequiresEmail(): void
+    {
+        $participant = $this->createAdultParticipant('');
+        $participant->dateOfBirth = (new \DateTimeImmutable('today'))->modify('-16 years');
+
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createAdultParticipant('[email protected]'),
+            $participant,
+        ]);
+
+        $violations = $this->validateStrict($bookingDto, 1);
+
+        $this->assertSame(['Bitte angeben'], $this->emailRequiredMessages($violations));
+    }
+
+    public function testDependentOneDayShortOfSixteenDoesNotRequireEmail(): void
+    {
+        $participant = $this->createAdultParticipant('');
+        $participant->dateOfBirth = (new \DateTimeImmutable('today'))->modify('-16 years')->modify('+1 day');
+
+        $bookingDto = $this->createBookingDtoWithParticipants([
+            $this->createAdultParticipant('[email protected]'),
+            $participant,
+        ]);
+
+        $violations = $this->validateStrict($bookingDto, 1);
+
+        $this->assertSame([], $this->emailRequiredMessages($violations));
+    }
+
+    /**
+     * Validates one participant with the strict group active, as the booking create flow does.
+     */
+    private function validateStrict(BookingDto $bookingDto, int $index): ConstraintViolationListInterface
+    {
+        return $this->validator->validate(
+            new ParticipantEditDto(
+                participant: $bookingDto->participants[$index],
+                bookingContext: $bookingDto,
+            ),
+            null,
+            ['booking_create', 'strict_required']
+        );
+    }
+
+    /**
+     * Narrows a violation list down to the "email is mandatory" messages.
+     *
+     * @return list<string>
+     */
+    private function emailRequiredMessages(ConstraintViolationListInterface $violations): array
+    {
+        $messages = [];
+
+        foreach ($violations as $violation) {
+            if ('participant.email' === $violation->getPropertyPath() && 'Bitte angeben' === $violation->getMessage()) {
+                $messages[] = $violation->getMessage();
+            }
+        }
+
+        return $messages;
+    }
+
     private function createTravelOfferingSkiPasses(?int $ageFrom = null): Travel
     {
         $travel = $this->createTravelWithoutSkiPasses();

tests/Form/Service/CreateFieldStateProviderTest.php

@@ -73,4 +73,95 @@ class CreateFieldStateProviderTest extends TestCase
             'Dependent insurance field must reappear once the applicant switches away from family insurance'
         );
     }
+
+    public function testEmailIsNotRequiredForNonApplicantChild(): void
+    {
+        $bookingDto = $this->createBookingDtoWithApplicantAndDependent(new \DateTimeImmutable('2015-01-01'));
+
+        $this->assertFalse(
+            $this->provider->getFieldState('email', $bookingDto, 1)['required'],
+            'A child travelling with an applicant does not need an email address of their own'
+        );
+    }
+
+    public function testEmailIsRequiredForNonApplicantAdult(): void
+    {
+        $bookingDto = $this->createBookingDtoWithApplicantAndDependent(new \DateTimeImmutable('1990-01-01'));
+
+        $this->assertTrue($this->provider->getFieldState('email', $bookingDto, 1)['required']);
+    }
+
+    public function testEmailIsRequiredForTheApplicantEvenAsAChild(): void
+    {
+        $bookingDto = $this->createBookingDtoWithApplicantAndDependent(new \DateTimeImmutable('2015-01-01'));
+        $bookingDto->participants[0]->dateOfBirth = new \DateTimeImmutable('2015-01-01');
+
+        $this->assertTrue(
+            $this->provider->getFieldState('email', $bookingDto, 0)['required'],
+            'The applicant is the booking contact and always has to be reachable'
+        );
+    }
+
+    public function testEmailIsRequiredWhenDateOfBirthIsUnknown(): void
+    {
+        $bookingDto = $this->createBookingDtoWithApplicantAndDependent(new \DateTimeImmutable('2015-01-01'));
+        $bookingDto->participants[1]->dateOfBirth = null;
+
+        $this->assertTrue(
+            $this->provider->getFieldState('email', $bookingDto, 1)['required'],
+            'An unknown age counts as an adult'
+        );
+    }
+
+    public function testEmailRequirementFlipsWhenDateOfBirthChanges(): void
+    {
+        $bookingDto = $this->createBookingDtoWithApplicantAndDependent(new \DateTimeImmutable('2015-01-01'));
+        $dependent = $bookingDto->participants[1];
+
+        $this->assertFalse($this->provider->getFieldState('email', $bookingDto, 1)['required']);
+
+        $dependent->dateOfBirth = new \DateTimeImmutable('1990-01-01');
+
+        $this->assertTrue(
+            $this->provider->getFieldState('email', $bookingDto, 1)['required'],
+            'Correcting a child date of birth to an adult one must reinstate the requirement'
+        );
+    }
+
+    /**
+     * Guards the switch from add-only to toggling 'required' state: the two fields that already
+     * used a 'required' condition must keep behaving exactly as before, now reporting false
+     * instead of omitting the key. Both declare 'required' => false as their base in the form
+     * type, so assigning the condition result either way is equivalent to the old add-only pass.
+     */
+    public function testMobileAndAddressRemainRequiredOnlyForTheFirstParticipant(): void
+    {
+        $bookingDto = $this->createBookingDtoWithApplicantAndDependent(new \DateTimeImmutable('1990-01-01'));
+
+        $this->assertTrue($this->provider->getFieldState('mobile', $bookingDto, 0)['required']);
+        $this->assertFalse($this->provider->getFieldState('mobile', $bookingDto, 1)['required']);
+
+        $this->assertTrue($this->provider->getFieldState('address', $bookingDto, 0)['required']);
+        $this->assertFalse($this->provider->getFieldState('address', $bookingDto, 1)['required']);
+    }
+
+    private function createBookingDtoWithApplicantAndDependent(\DateTimeImmutable $dependentDateOfBirth): BookingDto
+    {
+        $travel = new Travel();
+        $travel->dateFrom = new \DateTimeImmutable('+30 days');
+        $travel->dateTo = new \DateTimeImmutable('+37 days');
+
+        $applicant = new ParticipantDto();
+        $applicant->index = 0;
+        $applicant->dateOfBirth = new \DateTimeImmutable('1980-01-01');
+
+        $dependent = new ParticipantDto();
+        $dependent->index = 1;
+        $dependent->dateOfBirth = $dependentDateOfBirth;
+
+        $bookingDto = new BookingDto($travel, 1);
+        $bookingDto->participants = [$applicant, $dependent];
+
+        return $bookingDto;
+    }
 }

tests/Form/Service/EditFieldStateProviderTest.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Form\Service;
+
+use App\BusProNet\Model\Travel;
+use App\BusProNet\XmlLoader\AgencyLoader;
+use App\Form\Model\BookingDto;
+use App\Form\Model\ParticipantDto;
+use App\Form\Service\EditFieldStateProvider;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Covers the edit-flow email requirement, which follows the same age rule as the create flow
+ * but stands down entirely for internal agency bookings, where staff leave personal data blank.
+ */
+class EditFieldStateProviderTest extends TestCase
+{
+    private EditFieldStateProvider $provider;
+
+    protected function setUp(): void
+    {
+        $this->provider = new EditFieldStateProvider();
+    }
+
+    public function testEmailIsRequiredForNonApplicantAdult(): void
+    {
+        $bookingDto = $this->createBookingDto(new \DateTimeImmutable('1990-01-01'), false);
+
+        $this->assertTrue($this->provider->getFieldState('email', $bookingDto, 1)['required']);
+    }
+
+    public function testEmailIsNotRequiredForNonApplicantChild(): void
+    {
+        $bookingDto = $this->createBookingDto(new \DateTimeImmutable('2015-01-01'), false);
+
+        $this->assertFalse($this->provider->getFieldState('email', $bookingDto, 1)['required']);
+    }
+
+    public function testEmailIsNotRequiredForInternalAgencyBookingsEvenForAdults(): void
+    {
+        $bookingDto = $this->createBookingDto(new \DateTimeImmutable('1990-01-01'), true);
+
+        $this->assertFalse(
+            $this->provider->getFieldState('email', $bookingDto, 1)['required'],
+            'Internal agency bookings leave personal data optional throughout'
+        );
+    }
+
+    public function testEmailIsRequiredForTheApplicantOutsideInternalAgencyBookings(): void
+    {
+        $bookingDto = $this->createBookingDto(new \DateTimeImmutable('1990-01-01'), false);
+
+        $this->assertTrue($this->provider->getFieldState('email', $bookingDto, 0)['required']);
+    }
+
+    private function createBookingDto(\DateTimeImmutable $dependentDateOfBirth, bool $internalAgency): BookingDto
+    {
+        $travel = new Travel();
+        $travel->dateFrom = new \DateTimeImmutable('+30 days');
+        $travel->dateTo = new \DateTimeImmutable('+37 days');
+
+        $applicant = new ParticipantDto();
+        $applicant->index = 0;
+        $applicant->dateOfBirth = new \DateTimeImmutable('1980-01-01');
+
+        $dependent = new ParticipantDto();
+        $dependent->index = 1;
+        $dependent->dateOfBirth = $dependentDateOfBirth;
+
+        $bookingDto = new BookingDto($travel, 1);
+        $bookingDto->participants = [$applicant, $dependent];
+
+        if (true === $internalAgency) {
+            $bookingDto->agencyCode = AgencyLoader::INTERNAL_AGENCY_CODE;
+        }
+
+        return $bookingDto;
+    }
+}