Fixed tests related to constraint changes

tests/Composer/Test/DependencyResolver/RequestTest.php

@@ -14,6 +14,7 @@ namespace Composer\Test\DependencyResolver;
 
 use Composer\DependencyResolver\Request;
 use Composer\Repository\ArrayRepository;
+use Composer\Semver\Constraint\EmptyConstraint;
 use Composer\Test\TestCase;
 
 class RequestTest extends TestCase
@@ -34,7 +35,7 @@ class RequestTest extends TestCase
 
         $this->assertEquals(
             array(
-                'foo' => null,
+                'foo' => new EmptyConstraint(),
             ),
             $request->getRequires()
         );

tests/Composer/Test/DependencyResolver/RuleTest.php

@@ -104,6 +104,6 @@ class RuleTest extends TestCase
 
         $rule = new GenericRule(array($p1->getId(), -$p2->getId()), Rule::RULE_PACKAGE_REQUIRES, new Link('baz', 'foo'));
 
-        $this->assertEquals('baz 1.1 relates to foo -> satisfiable by foo[2.1].', $rule->getPrettyString($repositorySetMock, $requestMock, $pool, false));
+        $this->assertEquals('baz 1.1 relates to foo [] -> satisfiable by foo[2.1].', $rule->getPrettyString($repositorySetMock, $requestMock, $pool, false));
     }
 }

tests/Composer/Test/DependencyResolver/SolverTest.php

@@ -652,9 +652,9 @@ class SolverTest extends TestCase
 
             $msg = "\n";
             $msg .= "  Problem 1\n";
-            $msg .= "    - Root composer.json requires a -> satisfiable by A[1.0].\n";
+            $msg .= "    - Root composer.json requires a [] -> satisfiable by A[1.0].\n";
             $msg .= "    - A 1.0 conflicts with B 1.0.\n";
-            $msg .= "    - Root composer.json requires b -> satisfiable by B[1.0].\n";
+            $msg .= "    - Root composer.json requires b [] -> satisfiable by B[1.0].\n";
             $this->assertEquals($msg, $e->getPrettyString($this->repoSet, $this->request, $this->pool, false));
         }
     }
@@ -683,7 +683,7 @@ class SolverTest extends TestCase
 
             $msg = "\n";
             $msg .= "  Problem 1\n";
-            $msg .= "    - Root composer.json requires a -> satisfiable by A[1.0].\n";
+            $msg .= "    - Root composer.json requires a [] -> satisfiable by A[1.0].\n";
             $msg .= "    - A 1.0 requires b >= 2.0 -> found B[1.0] but it does not match the constraint.\n";
             $this->assertEquals($msg, $e->getPrettyString($this->repoSet, $this->request, $this->pool, false));
         }