feat: split booking between participants and applicant

addresses #869f2q1vu

tests/Form/Model/ParticipantDtoTest.php

@@ -205,46 +205,34 @@ class ParticipantDtoTest extends TestCase
         return $insurance;
     }
 
-    public function testRequiresOwnEmailIsFalseForNonApplicantChild(): void
+    public function testIsChildIsTrueBelowTheAgeThreshold(): void
     {
         $participant = new ParticipantDto();
         $participant->index = 1;
         $participant->dateOfBirth = new \DateTimeImmutable('2015-01-01');
 
-        $this->assertFalse($participant->requiresOwnEmail());
+        $this->assertTrue($participant->isChild());
     }
 
-    public function testRequiresOwnEmailIsTrueForNonApplicantAdult(): void
+    public function testIsChildIsFalseForAnAdult(): void
     {
         $participant = new ParticipantDto();
         $participant->index = 1;
         $participant->dateOfBirth = new \DateTimeImmutable('1990-01-01');
 
-        $this->assertTrue($participant->requiresOwnEmail());
+        $this->assertFalse($participant->isChild());
     }
 
-    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
+    public function testIsChildTreatsUnknownAgeAsAdult(): void
     {
         $participant = new ParticipantDto();
         $participant->index = 1;
         $participant->dateOfBirth = null;
 
-        $this->assertTrue($participant->requiresOwnEmail());
+        $this->assertFalse($participant->isChild(), 'An unknown date of birth counts as an adult');
     }
 
-    public function testRequiresOwnEmailBoundaryAtChildAgeThreshold(): void
+    public function testIsChildBoundaryAtAgeThreshold(): void
     {
         $exactlyThreshold = new ParticipantDto();
         $exactlyThreshold->index = 1;
@@ -257,7 +245,7 @@ class ParticipantDtoTest extends TestCase
             ->modify(sprintf('-%d years', ParticipantDto::CHILD_AGE_THRESHOLD))
             ->modify('+1 day');
 
-        $this->assertTrue($exactlyThreshold->requiresOwnEmail());
-        $this->assertFalse($oneDayShort->requiresOwnEmail());
+        $this->assertFalse($exactlyThreshold->isChild());
+        $this->assertTrue($oneDayShort->isChild());
     }
 }