diff --git a/lib/Cake/Test/Case/Model/Datasource/DboSourceTest.php b/lib/Cake/Test/Case/Model/Datasource/DboSourceTest.php
index 0faec562a81..e049be48075 100644
--- a/lib/Cake/Test/Case/Model/Datasource/DboSourceTest.php
+++ b/lib/Cake/Test/Case/Model/Datasource/DboSourceTest.php
@@ -166,10 +166,10 @@ public function testBooleanNullConditionsParsing() {
  */
 	public function testBooleanEmptyConditionsParsing() {
 		$result = $this->testDb->conditions(array('OR' => array()));
-		$this->assertEquals(' WHERE  1 = 1', $result, 'empty conditions failed %s');
+		$this->assertEquals(' WHERE  1 = 1', $result, 'empty conditions failed');
 
 		$result = $this->testDb->conditions(array('OR' => array('OR' => array())));
-		$this->assertEquals(' WHERE  1 = 1', $result, 'nested empty conditions failed %s');
+		$this->assertEquals(' WHERE  1 = 1', $result, 'nested empty conditions failed');
 	}
 
 /**
@@ -1116,4 +1116,73 @@ public function testBuildJoinStatement($join, $expected) {
 		$this->assertEquals($expected, $result);
 	}
 
+/**
+ * Test conditionKeysToString()
+ *
+ * @return void
+ */
+	public function testConditionKeysToString() {
+		$Article = ClassRegistry::init('Article');
+		$conn = $this->getMock('MockPDO', array('quote'));
+		$db = new DboTestSource;
+		$db->setConnection($conn);
+
+		$conn->expects($this->at(0))
+			->method('quote')
+			->will($this->returnValue('just text'));
+
+		$conditions = array('Article.name' => 'just text');
+		$result = $db->conditionKeysToString($conditions, true, $Article);
+		$expected = "Article.name = just text";
+		$this->assertEquals($expected, $result[0]);
+
+		$conn->expects($this->at(0))
+			->method('quote')
+			->will($this->returnValue('just text'));
+		$conn->expects($this->at(1))
+			->method('quote')
+			->will($this->returnValue('other text'));
+
+		$conditions = array('Article.name' => array('just text', 'other text'));
+		$result = $db->conditionKeysToString($conditions, true, $Article);
+		$expected = "Article.name IN (just text, other text)";
+		$this->assertEquals($expected, $result[0]);
+	}
+
+/**
+ * Test conditionKeysToString() with virtual field
+ *
+ * @return void
+ */
+	public function testConditionKeysToStringVirtualField() {
+		$Article = ClassRegistry::init('Article');
+		$Article->virtualFields = array(
+			'extra' => 'something virtual'
+		);
+		$conn = $this->getMock('MockPDO', array('quote'));
+		$db = new DboTestSource;
+		$db->setConnection($conn);
+
+		$conn->expects($this->at(0))
+			->method('quote')
+			->will($this->returnValue('just text'));
+
+		$conditions = array('Article.extra' => 'just text');
+		$result = $db->conditionKeysToString($conditions, true, $Article);
+		$expected = "(" . $Article->virtualFields['extra'] . ") = just text";
+		$this->assertEquals($expected, $result[0]);
+
+		$conn->expects($this->at(0))
+			->method('quote')
+			->will($this->returnValue('just text'));
+		$conn->expects($this->at(1))
+			->method('quote')
+			->will($this->returnValue('other text'));
+
+		$conditions = array('Article.extra' => array('just text', 'other text'));
+		$result = $db->conditionKeysToString($conditions, true, $Article);
+		$expected = "(" . $Article->virtualFields['extra'] . ") IN (just text, other text)";
+		$this->assertEquals($expected, $result[0]);
+	}
+
 }