Update test fixtures + fix test

tests/Composer/Test/Plugin/Fixtures/plugin-v1/composer.json

@@ -7,6 +7,6 @@
         "class": "Installer\\Plugin"
     },
     "require": {
-        "composer-plugin-api": "*"
+        "composer-plugin-api": "^1.0"
     }
 }

tests/Composer/Test/Plugin/Fixtures/plugin-v2/composer.json

@@ -7,6 +7,6 @@
         "class": "Installer\\Plugin2"
     },
     "require": {
-        "composer-plugin-api": "*"
+        "composer-plugin-api": "^1.0"
     }
 }

tests/Composer/Test/Plugin/Fixtures/plugin-v3/composer.json

@@ -7,6 +7,6 @@
         "class": "Installer\\Plugin2"
     },
     "require": {
-        "composer-plugin-api": "*"
+        "composer-plugin-api": "^1.0"
     }
 }

tests/Composer/Test/Plugin/Fixtures/plugin-v4/composer.json

@@ -10,6 +10,6 @@
         ]
     },
     "require": {
-        "composer-plugin-api": "1.0.0"
+        "composer-plugin-api": "^1.0"
     }
 }

tests/Composer/Test/Plugin/PluginInstallerTest.php

@@ -147,7 +147,7 @@ class PluginInstallerTest extends TestCase
         $this->repository
             ->expects($this->exactly(2))
             ->method('getPackages')
-            ->will($this->returnValue(array()));
+            ->will($this->returnValue(array($this->packages[3])));
         $installer = new PluginInstaller($this->io, $this->composer);
         $this->pm->loadInstalledPlugins();