Added initial unit testing files for the pgsql driver.

framework/yii/db/pgsql/Schema.php

@@ -0,0 +1,36 @@
+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db\pgsql;
+
+use yii\db\TableSchema;
+use yii\db\ColumnSchema;
+
+/**
+ * Schema is the class for retrieving metadata from a PostgreSQL database (version 9.x and above).
+ *
+ * @author Gevik Babakhani <gevikb@gmail.com>
+ * @since 2.0
+ */
+class Schema extends \yii\db\Schema
+{
+	/**
+	 * Loads the metadata for the specified table.
+	 * @param string $name table name
+	 * @return TableSchema|null driver dependent table metadata. Null if the table does not exist.
+	 */
+	public function loadTableSchema($name)
+	{
+		$table = new TableSchema();
+		$this->resolveTableNames($table, $name);
+		$this->findPrimaryKeys($table);
+		if ($this->findColumns($table)) {
+			$this->findForeignKeys($table);
+			return $table;
+		}
+	} 
+}