Embodiments of the present invention relate to a method and a device for obtaining test cases based on a code coverage. The method comprises creating a mapping between source code and test cases based on a code coverage; and obtaining, in response to a change in the source code, the test cases for the change based on the mapping. The device comprises: a creating module configured to create a mapping between source code and test cases based on a code coverage; and an obtaining module configured to, in response to a change in the source code, obtain a test case for the change based on the mapping. Through such method and device, the embodiments of the present invention can obtain test cases as few as possible to cover the changed source code.