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add test where we become constant but do not change value

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This commit is contained in:
Niko Matsakis 2018-10-11 04:56:34 -04:00
parent 6778898a34
commit 5e381f314b
1 changed files with 27 additions and 2 deletions
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29
tests/incremental/constants.rs
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@ -16,8 +16,7 @@ salsa::query_group! {
}
fn constants_add(db: &impl ConstantsDatabase, (key1, key2): (char, char)) -> usize {
db.log()
.add(format!("constants_derived({}, {}) invoked", key1, key2));
db.log().add(format!("add({}, {})", key1, key2));
db.constants_input(key1) + db.constants_input(key2)
}
@ -91,3 +90,29 @@ fn becomes_constant() {
assert_eq!(db.constants_add(('a', 'b')), 68);
assert!(db.query(ConstantsAdd).is_constant(('a', 'b')));
}
#[test]
fn becomes_constant_no_change() {
let db = &TestContextImpl::default();
db.query(ConstantsInput).set('a', 22);
db.query(ConstantsInput).set('b', 44);
assert_eq!(db.constants_add(('a', 'b')), 66);
assert!(!db.query(ConstantsAdd).is_constant(('a', 'b')));
db.assert_log(&["add(a, b)"]);
// 'a' is now constant, but the value did not change; this
// should not in and of itself trigger a new revision.
db.query(ConstantsInput).set_constant('a', 22);
assert_eq!(db.constants_add(('a', 'b')), 66);
assert!(!db.query(ConstantsAdd).is_constant(('a', 'b')));
db.assert_log(&[]); // no new revision, no new log entries
// 'b' is now constant, and its value DID change. This triggers a
// new revision, and at that point we figure out that we are
// constant.
db.query(ConstantsInput).set_constant('b', 45);
assert_eq!(db.constants_add(('a', 'b')), 67);
assert!(db.query(ConstantsAdd).is_constant(('a', 'b')));
db.assert_log(&["add(a, b)"]);
}