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105 lines
3.3 KiB
Markdown
105 lines
3.3 KiB
Markdown
Testing NASM
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============
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We use [Travis CI](https://travis-ci.org/) service to execute NASM tests,
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which basically prepares the environment and runs our `nasm-t.py` script.
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The script scans a testing directory for `*.json` test descriptor files
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and runs test by descriptor content.
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Test engine
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-----------
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`nasm-t.py` script is a simple test engine written by Python3 language
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which allows either execute a single test or run them all in a sequence.
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A typical test case processed by the following steps:
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- a test descriptor get parsed to figure out which arguments
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are to be provided into the NASM command line;
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- invoke the NASM with arguments;
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- compare generated files with precompiled templates.
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`nasm-t.py` supports the following commands:
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- `list`: to list all test cases
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- `run`: to run test cases
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- `update`: to update precompiled templates
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Use `nasm-t.py -h` command to get the detailed description of every option.
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Test descriptor file
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--------------------
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A descriptor file should provide enough information how to run the NASM
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itself and which output files or streams to compare with predefined ones.
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We use `JSON` format with the following fields:
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- `description`: a short description of a test which is shown to
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a user when tests are listed;
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- `id`: descriptor internal name to use with `ref` field;
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- `ref`: a reference to `id` from where settings should be
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copied, it is convenient when say only `option` is different
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while the rest of the fields are the same;
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- `format`: NASM output format to use (`bin`,`elf` and etc);
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- `source`: is a source file name to compile, this file must
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be shipped together with descriptor file itself;
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- `option`: an additional option passed to the command line;
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- `update`: a trigger to skip updating targets when running
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an update procedure;
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- `target`: an array of targets which the test engine should
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check once compilation finished:
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- `stderr`: a file containing *stderr* stream output to check;
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- `stdout`: a file containing *stdout* stream output to check;
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- `output`: a file containing compiled result to check, in other
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words it is a name passed as `-o` option to the compiler.
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Examples
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--------
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A simple test where no additional options are used, simply compile
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`absolute.asm` file with `bin` format for output, then compare
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produced `absolute.bin` file with precompiled `absolute.bin.dest`.
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```json
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{
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"description": "Check absolute addressing",
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"format": "bin",
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"source": "absolute.asm",
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"target": [
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{ "output": "absolute.bin" }
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]
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}
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```
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A slightly complex example: compile one source file with different optimization
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options and all results must be the same. To not write three descriptors
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we assign `id` to the first one and use `ref` term to copy settings.
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Also, it is expected that `stderr` stream will not be empty but carry some
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warnings to compare.
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```json
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[
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{
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"description": "Check 64-bit addressing (-Ox)",
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"id": "addr64x",
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"format": "bin",
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"source": "addr64x.asm",
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"option": "-Ox",
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"target": [
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{ "output": "addr64x.bin" },
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{ "stderr": "addr64x.stderr" }
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]
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},
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{
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"description": "Check 64-bit addressing (-O1)",
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"ref": "addr64x",
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"option": "-O1",
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"update": "false"
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},
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{
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"description": "Check 64-bit addressing (-O0)",
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"ref": "addr64x",
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"option": "-O0",
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"update": "false"
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}
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]
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```
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