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# Conspire
Conspire is an experiment in providing a portable R6RS/R7RS testing
library. It uses purely functional data structures in a mutable parameter
object, allowing for procedural programming inside of a dynamic extent
to not affect the rest of the test system.
## API
### `test-info` procedures
`test-info`
What SRFI-64 would call the "test runner" is in Conspire the `test-info`,
which contains a pure SRFI-225 dictionary with an associated DTO. The
dictionary must map at least symbols to values (including procedures).
Whenever a test group or a test is entered, a new dynamic extent is
entered with a new test-info object. Destructive updates to the new test
info are not reflected in the test info of the call.
The `test-info` is a parameter and can be modified with the `parameterize`
form. The inputs to `test-info` must be one of:
* `copy`: Return an unchanged copy of the `test-info`
* `replace dict [dto]`: In the new dynamic extent, the dictionary is
replaced with `dict`, optionally with new dto `dto`.
test-set!
test-update!
test-update/default!
test-delete-all!
test-contains?
test-ref
test-ref/default
test-update/default
These procedures are the same as their SRFI-225 equivalents, except
that the DTO and dictionary arguments are not needed, and that the
mutating procedures return unspecified values. For instance,
(test-set! key value)
is equivalent to `(dict-set! dto dict key value)`.
(modify-test-info! proc)
Evaluates `(proc dto dict)`, where `dto` is the current `test-info` DTO
and `dict` is the current `test-info` dict. The procedure must return
a dict satisfying the same DTO. This dictionary is set as the current
`test-info` dictionary within the dynamic extent.
(inspect-test-info proc)
Evaluates `(proc dto dict)`, where `dto` is the current `test-info` DTO
and `dict` is the current `test-info` dict, and returns the result.
### `test-info` Standard Procedure Keys
before-test (default-before-test name)
A procedure with one argument (the name of the test).
Called in the dynamic extent of the caller of the test. If it returns
false, then the test is skipped.
test-setup (test-setup)
A procedure of zero arguments. Called in the dynamic extent of a
test. Used to set up parts of a test.
after-test (default-after-test dto dict)
A procedure of two arguments (the DTO and dictionary of the test). Called
in the dynamic extent of the caller. Used to report information about
the test, and to merge desired information into the calling test info.
report-test (default-report-test dto dict)
A procedure of two arguments (the DTO and dictionary of the test). Used by
`default-after-test` to report the result of the test to the user.
group-begin (default-group-begin name)
A procedure of one argument (the name of the group). Called in the dynamic
extent of the group. Used to set up common information for a whole group.
group-end (default-group-end dto dict)
A procedure of two arguments (the DTO and the dictionary of the
test). Called in the dynamic extent containing the group. Used to report
information about the group and merge it with the containing test info.
### `test-info` Standard Keys
* `success?`: Truthy if the test passed.
* `exception`: The caught exception, if any.
* `tests`: Number of run tests.
* `passed`: Number of passed tests.
* `failed`: Number of failed tests.
* `skipped`: Number of skipped tests.
* `verbose?`: Used by the default test setups. If false, only failures are
printed. Otherwise all test case information is printed.
### Test Procedures and Forms
If `test-name` is `#f`, then the test is not given a name. Every procedure
here is implemented using `call-as-test`.
(call-as-test test-name thunk)
Call `thunk` with the test name `test-name`.
First executes the procedure stored in `before-test` in the `test-info` of
the caller. If that returns non-false, then it creates a new `test-info`
inheriting from the `test-info` of the caller, and runs the procedure
stored in `test-setup` (in the new `test-info`). Then `thunk` will
be executed in this dynamic extent. If `thunk` throws an exception,
it will be caught. Afterwards, the procedure stored in `after-test`
will be run with the `test-info` of the caller.
The test will set
* `success?`: Will be set to `#f` if an exception was caught.
* `exception`: Only set if an exception was caught. The value is the
caught exception.
(test-application test-name (name expr) ...)
The `name` must be symbols that are mutually not `bound-identifier=?`.
Runs a test with `test-name` that evaluates `(expr ...)`.
The test will set (in addition to `call-as-test`):
* `name`: To be the passed `expr` quoted.
* `application`: A list `(expr ...)`, where each is evaluated.
* `success?`: If `(expr ...)` evaluates to not false.
(with-test-assert test-name body ...)
Execute `body` in a test with `test-name`.
The test will set (in addition to `call-as-test`):
* `success?`: The returned value of `body` (if an exception is not caught).
(test-eq name %expected %actual)
(test-eqv name %expected %actual)
(test-equal name %expected %actual)
Convienence wrappers for
(test-application test-name ((procedure <procedure>)
(expected %expected)
(actual %actual)))
(test-approximate X Y eps)
Tests that
|X - Y| <= eps
The test will set (in addition to `call-as-test`):
* `procedure`: to be `%test-approximate` (this is an implementation detail).
* `expected`: to be `X`, quoted.
* `actual`: to be `Y`, quoted.
* `error`: to be `eps`, quoted.
* `application`: The `car` is `%test-approximate`, and the `cdr` is
`expected`, `actual`, and `error,` evaluated.
(with-test-error name error-predicate body ...)
Evaluates `body ...` in a test. This test will set
* `success?`: False if evaluation does not throw an exception. Otherwise
the return value of `error-predicate` on the thrown exception.
## Porting Guide
This library requires `make-parameter` and `parameterize` to work like
in R7RS. Most R6RS implementations should support dynamic parameters out
of the box.
Multi-threaded implementations must export an SRFI-18 compatible
interface for mutexes. Single threaded implementations can use the
`compat.single-threaded.sld` (`compat.single-threaded.sls` for R6RS)
implementations.
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