Automatic Unit Test Generation Based On Execution Traces

A method comprising:

• traversing trace data to identify (a) a target method that was previously executed and traced, (b) a first set of one or more input values that were received by the target method for execution of the target method, and (c) a first return value that was returned by the target method;
• based on the trace data, generating test code for testing the target method, the test code being configured to:
• invoke the target method using a first set of one or more objects (a) being of types corresponding to the one or more input values and (b) comprising the one or more input values;
• compare a second return value, to be returned by the target method in response to invoking the target method, to the first return value in the trace data;
• executing the test code, wherein executing the test code comprises:
• invoking the target method using the first set of one or more objects as arguments;
• receiving the second return value returned by the target method in response to invoking the target method;
• comparing the second return value to the first return value comprised in the trace data to determine whether the second return value matches the first return value;
• determining test results based on the comparing operation;
• wherein the first return value, comprised in the trace data, was generated by invocation of a first version of the target method, and wherein the second return value was generated by invocation of a second version of the target method;
• and
• presenting or storing the test results.

A system comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the system to perform:
• traversing trace data to identify (a) a target method that was previously executed and traced, (b) a first set of one or more input values that were received by the target method for execution of the target method, and (c) a first return value that was returned by the target method;
• based on the trace data, generating test code for testing the target method, the test code being configured to:
• invoke the target method using a first set of one or more objects (a) being of types corresponding to the one or more input values and (b) comprising the one or more input values;
• compare a second return value, to be returned by the target method in response to invoking the target method, to the first return value in the trace data;
• executing the test code, wherein executing the test code comprises:
• invoking the target method using the first set of one or more objects as arguments;
• receiving the second return value returned by the target method in response to invoking the target method;
• comparing the second return value to the first return value comprised in the trace data to determine whether the second return value matches the first return value;
• determining test results based on the comparing operation;
• wherein the first return value, comprised in the trace data, was generated by invocation of a first version of the target method, and wherein the second return value was generated by invocation of a second version of the target method;
• and
• presenting or storing the test results.