From eafe13d5a5eae6b9c18b4f5a8a893b4964be73ea Mon Sep 17 00:00:00 2001
From: Volker Dusch <github@wallbash.com>
Date: Sun, 19 Feb 2012 14:55:14 +0100
Subject: [PATCH] Create an impossible rule when trying to install something
 that doesn't exist.

The rule isn't acted upon yet (hence the incomplete test) but it is there as a reminder that this case needs to be handled.
---
 src/Composer/DependencyResolver/Solver.php       |  6 ++++++
 .../Test/DependencyResolver/SolverTest.php       | 16 ++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/Composer/DependencyResolver/Solver.php b/src/Composer/DependencyResolver/Solver.php
index 4359f3102..a395ad969 100644
--- a/src/Composer/DependencyResolver/Solver.php
+++ b/src/Composer/DependencyResolver/Solver.php
@@ -964,6 +964,12 @@ class Solver
 
 
         foreach ($this->jobs as $job) {
+            if (empty($job['packages']) && $job['cmd'] == 'install') {
+                $this->addRule(
+                    RuleSet::TYPE_JOB,
+                    $this->createImpossibleRule(static::RULE_JOB_INSTALL, $job)
+                );
+            }
             foreach ($job['packages'] as $package) {
                 switch ($job['cmd']) {
                     case 'install':
diff --git a/tests/Composer/Test/DependencyResolver/SolverTest.php b/tests/Composer/Test/DependencyResolver/SolverTest.php
index 18cb9f4a1..5ad7e90c3 100644
--- a/tests/Composer/Test/DependencyResolver/SolverTest.php
+++ b/tests/Composer/Test/DependencyResolver/SolverTest.php
@@ -55,6 +55,22 @@ class SolverTest extends TestCase
         ));
     }
 
+    public function testInstallNonExistingPackageFails()
+    {
+        $this->repo->addPackage($this->getPackage('A', '1.0'));
+        $this->reposComplete();
+
+        $this->request->install('B');
+
+        try {
+            $transaction = $this->solver->solve($this->request);
+            $this->markTestIncomplete('Reporting this failure is not implemented/working yet');
+            //$this->fail('Unsolvable conflict did not resolve in exception.');
+        } catch (SolverProblemsException $e) {
+            // @todo: assert problem properties
+        }
+    }
+
     public function testSolverInstallWithDeps()
     {
         $this->repo->addPackage($packageA = $this->getPackage('A', '1.0'));