Introduce fake implementation of signer for tests

This allows us to stop using PHPUnit mocks in every place that needs,
making tests more obvious.

Signed-off-by: Luís Cobucci <lcobucci@gmail.com>

phpcs.xml.dist

@@ -16,7 +16,7 @@
     <rule ref="Lcobucci" />
 
     <rule ref="SlevomatCodingStandard.Functions.UnusedParameter">
-        <exclude-pattern>tests/UnsupportedParser.php</exclude-pattern>
+        <exclude-pattern>tests</exclude-pattern>
     </rule>
 </ruleset>
 

tests/Signer/FakeSigner.php

@@ -0,0 +1,30 @@
+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\JWT\Tests\Signer;
+
+use Lcobucci\JWT\Signer;
+use Lcobucci\JWT\Signer\Key;
+
+final class FakeSigner implements Signer
+{
+    /** @param non-empty-string $signature */
+    public function __construct(private readonly string $signature)
+    {
+    }
+
+    public function algorithmId(): string
+    {
+        return 'FAKE-' . $this->signature;
+    }
+
+    public function sign(string $payload, Key $key): string
+    {
+        return $this->signature . '-' . $key->contents();
+    }
+
+    public function verify(string $expected, string $payload, Key $key): bool
+    {
+        return $this->signature . '-' . $key->contents() === $expected;
+    }
+}

tests/Validation/Constraint/ConstraintTestCase.php

@@ -3,9 +3,14 @@
 
 namespace Lcobucci\JWT\Tests\Validation\Constraint;
 
+use Closure;
+use Lcobucci\JWT\Builder;
+use Lcobucci\JWT\JwtFacade;
+use Lcobucci\JWT\Signer;
 use Lcobucci\JWT\Token\DataSet;
 use Lcobucci\JWT\Token\Plain;
 use Lcobucci\JWT\Token\Signature;
+use Lcobucci\JWT\UnencryptedToken;
 use PHPUnit\Framework\TestCase;
 
 abstract class ConstraintTestCase extends TestCase
@@ -25,4 +30,13 @@ protected function buildToken(
             $signature ?? new Signature('sig+hash', 'sig+encoded'),
         );
     }
+
+    protected function issueToken(Signer $signer, Signer\Key $key, ?Closure $customization = null): UnencryptedToken
+    {
+        return (new JwtFacade())->issue(
+            $signer,
+            $key,
+            $customization ?? static fn (Builder $builder) => $builder,
+        );
+    }
 }