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core: fix linked list tests reusing Registrations #1016

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merged 5 commits into from
Oct 5, 2020
Merged

core: fix linked list tests reusing Registrations #1016

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1db78f1
core: fix linked list tests reusing Registrations
hawkw Oct 5, 2020
128c9e5
core: simplify test callsites
hawkw Oct 5, 2020
8cb25a4
add test for pushing a bunch of stuff
hawkw Oct 5, 2020
35f5a49
fixup new test
hawkw Oct 5, 2020
e90c19c
clippy, etc
hawkw Oct 5, 2020
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83 changes: 67 additions & 16 deletions tracing-core/src/callsite.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -276,23 +276,11 @@ impl LinkedList {
mod tests {
use super::*;

#[derive(Eq, PartialEq)]
struct Cs1;
static CS1: Cs1 = Cs1;
static REG1: Registration = Registration::new(&CS1);
struct TestCallsite;
static CS1: TestCallsite = TestCallsite;
static CS2: TestCallsite = TestCallsite;

impl Callsite for Cs1 {
fn set_interest(&self, _interest: Interest) {}
fn metadata(&self) -> &Metadata<'_> {
unimplemented!("not needed for this test")
}
}

struct Cs2;
static CS2: Cs2 = Cs2;
static REG2: Registration = Registration::new(&CS2);

impl Callsite for Cs2 {
impl Callsite for TestCallsite {
fn set_interest(&self, _interest: Interest) {}
fn metadata(&self) -> &Metadata<'_> {
unimplemented!("not needed for this test")
Expand All @@ -301,6 +289,9 @@ mod tests {

#[test]
fn linked_list_push() {
static REG1: Registration = Registration::new(&CS1);
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LOL I knoew this was dumb good catch

static REG2: Registration = Registration::new(&CS2);

let linked_list = LinkedList::new();

linked_list.push(&REG1);
Expand All @@ -325,9 +316,69 @@ mod tests {
});
}

#[test]
fn linked_list_push_several() {
static REG1: Registration = Registration::new(&CS1);
static REG2: Registration = Registration::new(&CS2);
static REG3: Registration = Registration::new(&CS1);
static REG4: Registration = Registration::new(&CS2);

let linked_list = LinkedList::new();

fn expect<'a>(
callsites: &'a mut impl Iterator<Item = &'static Registration>,
) -> impl FnMut(&'static Registration) + 'a {
move |reg: &'static Registration| {
let ptr = callsites
.next()
.expect("list contained more than the expected number of registrations!");

assert!(
ptr::eq(reg, ptr),
"Registration pointers need to match ({:?} != {:?})",
reg,
ptr
);
}
}

linked_list.push(&REG1);
linked_list.push(&REG2);
let regs = [&REG2, &REG1];
let mut callsites = regs.iter().copied();
linked_list.for_each(expect(&mut callsites));
assert!(
callsites.next().is_none(),
"some registrations were expected but not present: {:?}",
callsites
);

linked_list.push(&REG3);
let regs = [&REG3, &REG2, &REG1];
let mut callsites = regs.iter().copied();
linked_list.for_each(expect(&mut callsites));
assert!(
callsites.next().is_none(),
"some registrations were expected but not present: {:?}",
callsites
);

linked_list.push(&REG4);
let regs = [&REG4, &REG3, &REG2, &REG1];
let mut callsites = regs.iter().copied();
linked_list.for_each(expect(&mut callsites));
assert!(
callsites.next().is_none(),
"some registrations were expected but not present: {:?}",
callsites
);
}

#[test]
#[should_panic]
fn linked_list_repeated() {
static REG1: Registration = Registration::new(&CS1);

let linked_list = LinkedList::new();

linked_list.push(&REG1);
Expand Down