Debug mongos server count

Author: jmikola

tests/SpecTests/RetryableReads/Prose2_RetryOnMongosTest.php

@@ -37,6 +37,10 @@ public function testRetryOnDifferentMongos(): void
          * TODO: Support topologies with 3+ servers by selecting only two and
          * recreating a client URI.
          */
+        if (count($this->manager->getServers() !== 2) {
+            $this->fail('Unexpected server count: ' . count($this->manager->getServers()));
+        }
+
         assert(count($this->manager->getServers()) === 2);
 
         // Step 2: Configure the following fail point on each mongos

tests/SpecTests/RetryableWrites/Prose4_RetryOnDifferentMongosTest.php

@@ -39,6 +39,10 @@ public function testRetryOnDifferentMongos(): void
          * TODO: Support topologies with 3+ servers by selecting only two and
          * recreating a client URI.
          */
+        if (count($this->manager->getServers() !== 2) {
+            $this->fail('Unexpected server count: ' . count($this->manager->getServers()));
+        }
+
         assert(count($this->manager->getServers()) === 2);
 
         // Step 2: Configure the following fail point on each mongos