International Business Machines Corporation

Yoram Simha Adler

Aviad Zlotnick

Dale E Blue

Orna Raz

Gal Ashour

Rachel Tzoref-Brill

Onn Menahem Shehory

Moshe Klausner

Konstantin Kupeev

Noam Behar

Orna X Orna Raz-Pelleg

Eitan D Farchi

Orna Raz-Pelleg

A method and apparatus for estimating coverage of a computer program from traces, the method comprising: receiving trace data generated by an execution of an executable unit; and estimating coverage of the executable unit from the trace data, wherein estimating coverage comprises estimating trace coverage.

Trace coverage analysis

Test coverage is enhanced by measuring various types of coupling between coverage tasks. The coupling measurements may be implicit coupling measurements, explicit coupling measurements, coding coupling measurements, performance coupling measurements, resource coupling measurements or the like. Coupling scores are calculated for coverage tasks and based thereon ranking of the coverage tasks or groups of coverage tasks may be determined The ranking may be utilized in selecting for which uncovered coverage task a test should be designed. The ranking may be utilized in computing a coverage measurement of a test suite. The ranking may be utilized to rank tests, based on the coverage tasks each test covers. Ranking of tests may be utilized for various purposes such as performing test selection.

Measuring coupling between coverage tasks and use thereof

Test coverage is enhanced by measuring various types of coupling between coverage tasks. The coupling measurements may be implicit coupling measurements, explicit coupling measurements, coding coupling measurements, performance coupling measurements, resource coupling measurements or the like. Based on the coupling measurements, different coverage tasks may be grouped together. For example, closely coupled coverage tasks may be grouped together. The groups may also be determined based on an initial distribution of groups, by combining groups having closely coupled member coverage tasks. The groups may be ordered and prioritized, such as based on the size of the groups and the number of uncovered tasks in each group. The groups may also be ordered, such as based on coupling score which aggregate the coupling measurements of the member coverage tasks.

A functional coverage model may be generated based on a trace. The functional coverage model may comprise values of attributes. The values may be extracted from one or more entries comprised by the trace. Based upon a selection of a field of an exemplary entry, content of the corresponding fields in other entries may be extracted and utilized. In some exemplary embodiments, names of attributes may be extracted from the trace. In some exemplary embodiments, a reference trace may be utilized as a comparative baseline coverage by generating a functional coverage model based upon the reference trace and comparing coverage of a second trace in respect to the functional coverage model with the coverage of the reference trace.

Generating a functional coverage model from a trace

A meta attribute useful for functional coverage is computed based on values comprised by two or more matching fields in a trace. The two or more matching fields may be comprised by a single entry of the trace or by a plurality of entries of the trace. A definition of the meta attribute may define which fields of the entries comprise values useful for computation of the meta attributes. The matching entries may be identified based on identifying values within the entries.

Meta attributes in functional coverage models

Convergent playback of buffered content to real-time content play. A content viewing system is provided including a content player operative to receive a content stream from a content source, a content viewer operative to receive the content from the content player, and a buffer into which the content player may store the received content and from which the player may provide the stored content to the content viewer, where the content player is operative to buffer the content stream to the buffer responsive to a request to pause play of the content stream, and retrieve the content from the buffer for playback of the buffered content stream responsive to a request to resume play of the content stream, thereby emptying the buffer, where the buffer is emptied at a faster rate than the rate at which the content stream is buffered, and the rate at which the buffer is emptied varies.

Convergent playback of buffered content to real-time content play

Provides convergent playback of buffered content to real-time content play A content viewing system includes a content player to receive a content stream from a content source, a content viewer to receive the content from the content player, and a buffer into which the content player may store the received content and from which the player may provide the stored content to the content viewer, where the content player is operative to buffer the content stream to the buffer responsive to a request to pause play of the content stream, and retrieve the content from the buffer for playback of the buffered content stream responsive to a request to resume play of the content stream, thereby emptying the buffer, where the buffer is emptied at a faster rate than the rate at which the content stream is buffered, and the rate at which the buffer is emptied varies.

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Haifa, Israel

Yoram Simha Adler