Add todos to explain why try/catch is inside the test

tests/Composer/Test/DependencyResolver/SolverTest.php

@@ -503,6 +503,7 @@ class SolverTest extends TestCase
             $transaction = $this->solver->solve($this->request);
             $this->fail('Unsolvable conflict did not resolve in exception.');
         } catch (SolverProblemsException $e) {
+            // @todo: assert problem properties
         }
     }
 
@@ -523,6 +524,7 @@ class SolverTest extends TestCase
             $transaction = $this->solver->solve($this->request);
             $this->fail('Unsolvable conflict did not resolve in exception.');
         } catch (SolverProblemsException $e) {
+            // @todo: assert problem properties
         }
     }