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add section on input testing/validation
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== Implement missing Matlab functions == | == Implement missing Matlab functions == | ||
Use the [https://savannah.gnu.org/patch/?func=additem&group=octave Savannah patch tracker] for submissions unrelated to an existing bug. | * Use the [https://savannah.gnu.org/patch/?func=additem&group=octave Savannah patch tracker] for submissions unrelated to an existing bug. | ||
== Test Octave functions for proper input handling == | |||
* Many functions either do insufficient input checking or the input requirements have changed over time. | |||
* Contributors can try to break Octave function behavior with different types of input, and document the results. | |||
* Users can check <em>expected behavior</em> according to the Octave help and, if applicable, expected compatible behavior according to [https://www.mathworks.com/help/matlab/ public facing Matlab documentation]. | |||
* Inputs to test can be: | |||
** different numeric types - double, single, integer. | |||
** non-numeric types - logical, string, cell, struct | |||
** different input shapes - scalar, row/column vectors, 2D, 3D, & nD arrays, zero size arrays ([], 1x0, and 1x3x0 are all empty but may require different handling). | |||
** char/string parameters: different case handling, partial matching behavior, invalid/nonsense parameters. | |||
* For the input items above, does function behave acceptably? Are numerical or graphical outputs as expected? Is output consistent? Is any error message intelligible/meaningful to the user? | |||
* Optionally the behavior above can be tested against Matlab function output if it is available. If needed but not available, tests can be submitted to other developers for output checking. | |||
** Note 1: There is much undocumented Matlab behavior. Because this has the possibility of changing with little notice, fixing incompatibilities related to such undocumented behavior is considered on a case-by-case basis by the developer team. Documentation of such cases is always beneficial, however. | |||
** Note 2: Only Matlab public documentation and function output may be compared. <em>Internal Matlab code, even if available, should never even be looked at by a contributor. Contributions will be discarded if it is determined such action occurred.</em> | |||
* Contributors can submit bug reports to the [https://savannah.gnu.org/bugs/?group=octave Octave Bug Tracker] documenting their findings. | |||
* An example can be see in bug {{bug|64078}} comment #10 of looking through the /plot/draw functions for how they handle integer and logical inputs to numeric fields. | |||
== Write Built-In Self Tests (BISTs) == | == Write Built-In Self Tests (BISTs) == | ||