Validate Collection $namespace and test getters

src/Collection.php

@@ -52,14 +52,22 @@ class Collection
      * @param string         $namespace      Collection namespace (e.g. "db.collection")
      * @param WriteConcern   $writeConcern   Default write concern to apply
      * @param ReadPreference $readPreference Default read preference to apply
+     * @throws InvalidArgumentException if $namespace is invalid
      */
     public function __construct(Manager $manager, $namespace, WriteConcern $writeConcern = null, ReadPreference $readPreference = null)
     {
+        $parts = explode('.', $namespace, 2);
+
+        if (count($parts) != 2 || strlen($parts[0]) == 0 || strlen($parts[1]) == 0) {
+            throw new InvalidArgumentException('$namespace is invalid: ' . $namespace);
+        }
+
+        $this->databaseName = $parts[0];
+        $this->collectionName = $parts[1];
+
         $this->manager = $manager;
         $this->writeConcern = $writeConcern;
         $this->readPreference = $readPreference;
-
-        list($this->databaseName, $this->collectionName) = explode(".", $namespace, 2);
     }
 
     /**

tests/Collection/CollectionFunctionalTest.php

@@ -2,6 +2,7 @@
 
 namespace MongoDB\Tests\Collection;
 
+use MongoDB\Collection;
 use MongoDB\Driver\BulkWrite;
 
 /**
@@ -9,6 +10,47 @@ use MongoDB\Driver\BulkWrite;
  */
 class CollectionFunctionalTest extends FunctionalTestCase
 {
+    /**
+     * @expectedException MongoDB\Exception\InvalidArgumentException
+     * @dataProvider provideInvalidNamespaceValues
+     */
+    public function testConstructorNamespaceArgument($namespace)
+    {
+        // TODO: Move to unit test once ManagerInterface can be mocked (PHPC-378)
+        new Collection($this->manager, $namespace);
+    }
+
+    public function provideInvalidNamespaceValues()
+    {
+        return array(
+            array(null),
+            array(''),
+            array('db_collection'),
+            array('db'),
+            array('.collection'),
+        );
+    }
+
+    public function testToString()
+    {
+        $this->assertEquals($this->getNamespace(), (string) $this->collection);
+    }
+
+    public function getGetCollectionName()
+    {
+        $this->assertEquals($this->getCollectionName(), $this->collection->getCollectionName());
+    }
+
+    public function getGetDatabaseName()
+    {
+        $this->assertEquals($this->getDatabaseName(), $this->collection->getDatabaseName());
+    }
+
+    public function testGetNamespace()
+    {
+        $this->assertEquals($this->getNamespace(), $this->collection->getNamespace());
+    }
+
     public function testDrop()
     {
         $writeResult = $this->collection->insertOne(array('x' => 1));