International Business Machines Corporation

Christopher Loers

Brad D Stilwell

Alexander A Smith

Dominic DeMarco

Embodiments of the invention include methods and systems for improving test case coverage. Aspects of the invention include executing, by a processor, a first test case, where the first test case includes a plurality of system calls to an operating system. Prior to execution of each system call in the plurality of system calls in the first test case, executing, by the processor, a pre-exit instruction. Responsive to execution of the pre-exit instruction, collecting pre-exit system call data regarding each system call in the plurality of system calls for the first test case. The processor executes a post-exit instruction after completion of each system call in the plurality of system calls and responsive to execution of the post-exit instruction, collects post-exit system call data regarding each system call in the plurality of system calls for the first test case.

Measuring and improving test coverage

Embodiments of the invention include systems for testing pre and post system call exits. Aspects include executing a first test case comprises system calls and the first test case initializes a common buffer and stores system call parameters for each of the system calls. A monitoring test case is executed comprising: a pre-exit instruction that is inserted before each system call in the first test case. A post-exit instruction is inserted after each of the system calls in the first test case. Execution of the pre-exit instruction is determined prior to an execution of each system call. A first bit location is set in the common buffer to one, based on determining the pre-exit instruction executes. The system call is executed and execution of the post-exit instruction is determined. A second bit location in the common buffer is set to one based on determining that the post-exit instruction executes.

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Poughkeepsie, NY, United States of America

Christopher Loers