write tests for input

tests/incremental/memoized_inputs.rs

@@ -0,0 +1,72 @@
+use crate::implementation::{TestContext, TestContextImpl};
+
+crate trait MemoizedInputsContext: TestContext {
+    salsa::query_prototype! {
+        fn max() for Max;
+        fn input1() for Input1;
+        fn input2() for Input2;
+    }
+}
+
+salsa::query_definition! {
+    crate Max(query: &impl MemoizedInputsContext, (): ()) -> usize {
+        query.log().add("Max invoked");
+        std::cmp::max(
+            query.input1().read(),
+            query.input2().read(),
+        )
+    }
+}
+
+salsa::query_definition! {
+    #[storage(input)]
+    crate Input1(_query: &impl MemoizedInputsContext, _value: ()) -> usize {
+        panic!("silly")
+    }
+}
+
+salsa::query_definition! {
+    #[storage(input)]
+    crate Input2(_query: &impl MemoizedInputsContext, _value: ()) -> usize {
+        panic!("silly")
+    }
+}
+
+#[test]
+fn revalidate() {
+    let query = TestContextImpl::default();
+
+    let v = query.max().of(());
+    assert_eq!(v, 0);
+    query.assert_log(&["Max invoked"]);
+
+    let v = query.max().of(());
+    assert_eq!(v, 0);
+    query.assert_log(&[]);
+
+    query.input1().set((), 44);
+    query.assert_log(&[]);
+
+    let v = query.max().of(());
+    assert_eq!(v, 44);
+    query.assert_log(&["Max invoked"]);
+
+    let v = query.max().of(());
+    assert_eq!(v, 44);
+    query.assert_log(&[]);
+
+    query.input1().set((), 44);
+    query.assert_log(&[]);
+    query.input2().set((), 66);
+    query.assert_log(&[]);
+    query.input1().set((), 64);
+    query.assert_log(&[]);
+
+    let v = query.max().of(());
+    assert_eq!(v, 66);
+    query.assert_log(&["Max invoked"]);
+
+    let v = query.max().of(());
+    assert_eq!(v, 66);
+    query.assert_log(&[]);
+}