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extern crate rspec;
pub fn main() {
// The easiest way to open a suite is by calling the `rspec::run(…)` function,
// passing it the result of one of these functions:
//
// - `rspec::suite`,
// - `rspec::describe`
// - `rspec::given`
//
// which all behave the same and only differ in the label
// that is printed the the est suite's log.
//
// One then passes the following arguments to aforementioned function:
//
// - a name (to add some more meaning to the runner's output)
// - an initial value (to base the tests on)
// - a closure (to provide the suite's test logic)
rspec::run(&rspec::given("a value of zero", 0, |ctx| {
ctx.then("it is zero", |value| {
assert_eq!(*value, 0);
});
ctx.when("multiplying by itself", |ctx| {
// Any time one wants to mutate the value being tested
// one does so by calling `ctx.before(…)` (or `ctx.after(…)`),
// which will execute the provided closure before any other
// sub-context (e.g. `ctx.when(…)`) or example (e.g. `ctx.then(…)`)
// is executed:
ctx.before(|value| {
*value *= *value;
});
ctx.then("it remains zero", |value| {
assert_eq!(*value, 0);
});
});
ctx.when("adding a value to it", |ctx| {
ctx.before(|value| {
*value += 42;
});
ctx.then("it becomes said value", |value| {
assert_eq!(*value, 42);
});
});
}));
}
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