I want to test the output of method checkCredentials():

Class BuildParticipant
{
    public function __construct(DBConnectionWrapper $db, ?Logger $logger=null)
    {
        $this->participant = new ParticipantView($db);
        // snip
    }

    public function build($participantId)
    {
       $credentialsOK = $this->checkCredentials($participantId, $this->participant);
       // snip
    }
 
    protected function checkCredentials($participantId, Crud $participant): bool
    {
        $data = $participant->find($participantId)->nextRecord();
        // do some logic on $data and return boolean

My original way of writing the function was not very testable:

    protected function checkCredentials($participantId): bool
    {
        $data = $this->participant->find($participantId)->nextRecord();

I figured that injecting ParticipantView into the method would allow me to inject a mock ParticipantView::find()

I’m having trouble crafting the mock (or stub – not sure about terminology)

<?php
use PHPUnitFrameworkTestCase;

class buildNewParticipantTest extends TestCase {
    public function testCredentialInclusion()
    {
        $mockDb = $this->getMockBuilder('Database')->getMock();

        // unsuccessful attempt to fix error in test (ParticipantView is a CrudView)
        $participantView = new ParticipantView($mockDb);

        $pv = $this
                ->getMockBuilder($participantView::class)
                ->onlyMethods(['find'])
                ->getMock();

        $pv
            ->expects($this->once())
            ->method('find')
            ->willReturn([
                'id'        => '1234',
                'ssn'       => '555-12-3456',
                'lastName'  => 'Smith',
                'firstName' => 'John',
                'credentials' => 'foo' 
            ]);

        $this->assertEquals('John', $pv['firstName']);
    }
}

yields

There was 1 error:

1) buildNewParticipantTest::testCredentialInclusion
ArgumentCountError: Too few arguments to function CrudView::__construct(), 0 passed

How do I pass a mock Database object into the mock ParticipantView object?