PoolBuilderTest: Allow setting filter options for repositories

tests/Composer/Test/DependencyResolver/Fixtures/poolbuilder/must-expand-root-reqs.test

@@ -0,0 +1,36 @@
+--TEST--
+Fixed packages do not get loaded from the repos
+
+--REQUEST--
+{
+    "require": {
+        "some/pkg": "*",
+        "root/req": "*"
+    }
+}
+
+--FIXED--
+[
+    {"name": "some/pkg", "version": "1.0.3", "id": 1},
+    {"name": "dep/dep", "version": "2.1.5", "id": 2}
+]
+
+--PACKAGE-REPOS--
+[
+    [
+        {"name": "some/pkg", "version": "1.0.0"},
+        {"name": "some/pkg", "version": "1.1.0"},
+        {"name": "root/req", "version": "1.0.0", "require": {"dep/dep": "2.*"}},
+        {"name": "root/req", "version": "2.0.0", "require": {"dep/dep": "3.*"}},
+        {"name": "dep/dep", "version": "2.3.4"},
+        {"name": "dep/dep", "version": "3.0.1"}
+    ]
+]
+
+--EXPECT--
+[
+    1,
+    2,
+    "root/req-1.0.0.0",
+    "root/req-2.0.0.0"
+]

tests/Composer/Test/DependencyResolver/PoolBuilderTest.php

@@ -14,6 +14,7 @@ namespace Composer\Test\DependencyResolver;
 
 use Composer\IO\NullIO;
 use Composer\Repository\ArrayRepository;
+use Composer\Repository\FilterRepository;
 use Composer\Repository\LockArrayRepository;
 use Composer\DependencyResolver\DefaultPolicy;
 use Composer\DependencyResolver\Pool;
@@ -74,8 +75,16 @@ class PoolBuilderTest extends TestCase
 
         $repositorySet = new RepositorySet($minimumStability, $stabilityFlags, $rootAliases, $rootReferences);
         foreach ($packageRepos as $packages) {
-            $repositorySet->addRepository($repo = new ArrayRepository());
+            $repo = new ArrayRepository();
-           foreach ($packages as $package) {
+            if (isset($packages['canonical']) || isset($packages['only']) || isset($packages['exclude'])) {
+                $options = $packages;
+                $packages = $options['packages'];
+                unset($options['packages']);
+                $repositorySet->addRepository(new FilterRepository($repo, $options));
+            } else {
+                $repositorySet->addRepository($repo);
+            }
+            foreach ($packages as $package) {
                 $repo->addPackage($loadPackage($package));
             }
         }