remove pointless test rng class

we were testing a test class, which didn't make a lot of sense.

tests/Providers/Rng/CSRNGProviderTest.php

@@ -11,18 +11,11 @@ class CSRNGProviderTest extends TestCase
 {
     use NeedsRngLengths;
 
-    /**
-     * @requires function random_bytes
-     */
     public function testCSRNGProvidersReturnExpectedNumberOfBytes(): void
     {
-        if (function_exists('random_bytes')) {
-            $rng = new CSRNGProvider();
-            foreach ($this->rngTestLengths as $l) {
-                $this->assertSame($l, strlen($rng->getRandomBytes($l)));
-            }
-        } else {
-            $this->expectNotToPerformAssertions();
+        $rng = new CSRNGProvider();
+        foreach ($this->rngTestLengths as $l) {
+            $this->assertSame($l, strlen($rng->getRandomBytes($l)));
         }
     }
 }

tests/Providers/Rng/IRNGProviderTest.php

@@ -15,17 +15,4 @@ public function testCreateSecret(): void
         $tfa = new TwoFactorAuth('Test', 6, 30, Algorithm::Sha1, null, null);
         $this->assertIsString($tfa->createSecret());
     }
-
-    public function testCreateSecretGeneratesDesiredAmountOfEntropy(): void
-    {
-        $rng = new TestRNGProvider();
-
-        $tfa = new TwoFactorAuth('Test', 6, 30, Algorithm::Sha1, null, $rng);
-        $this->assertSame('A', $tfa->createSecret(5));
-        $this->assertSame('AB', $tfa->createSecret(6));
-        $this->assertSame('ABCDEFGHIJKLMNOPQRSTUVWXYZ', $tfa->createSecret(128));
-        $this->assertSame('ABCDEFGHIJKLMNOPQRSTUVWXYZ234567', $tfa->createSecret(160));
-        $this->assertSame('ABCDEFGHIJKLMNOPQRSTUVWXYZ234567ABCDEFGHIJKLMNOPQRSTUVWXYZ234567', $tfa->createSecret(320));
-        $this->assertSame('ABCDEFGHIJKLMNOPQRSTUVWXYZ234567ABCDEFGHIJKLMNOPQRSTUVWXYZ234567A', $tfa->createSecret(321));
-    }
 }