Add a warning when using the --skip-initial-test-suite option

src/Console/ConsoleOutput.php

@@ -129,4 +129,13 @@ public function logNotInControlOfExitCodes(): void
             'It is your responsibility to disable xdebug/phpdbg unless needed.',
         ]);
     }
+
+    public function logSkippingInitialTestSuite(): void
+    {
+        $this->io->warning([
+            'Skipping the initial test suite run can be very dangerous.' . PHP_EOL .
+            'It is your responsibility to ensure the test suite is in a passing state to begin.' . PHP_EOL .
+            'If this is not done then mutations may report as caught when they are not.',
+        ]);
+    }
 }

src/Engine.php

@@ -113,6 +113,7 @@ public function execute(int $threads): bool
     private function runInitialTestSuite(): void
     {
         if ($this->config->shouldSkipInitialTestSuite()) {
+            $this->consoleOutput->logSkippingInitialTestSuite();
             $this->assertCodeCoverageExists(null, $this->config->getTestFramework());
             return;
         }