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Douglas Creager 2025-10-09 09:57:53 -04:00
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14
crates/ty_python_semantic/resources/mdtest/hover.md
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# Hover type assertions
You can use the `hover` assertion to test the infered type of an expression. This exercises the same
logic as the hover LSP action.
You can use the `hover` assertion to test the inferred type of an expression. This exercises the
same logic as the hover LSP action.
Typically, you will not need to use the `hover` action to test the behavior of our type inference
code, since you can also use `reveal_type` to display the infered type of an expression. Since
code, since you can also use `reveal_type` to display the inferred type of an expression. Since
`reveal_type` is part of the standard library, we prefer to use it when possible.
However, there are certain situations where `reveal_type` and `hover` will give different results.
@ -16,10 +16,10 @@ In particular, `reveal_type` is not transparent to bidirectional type checking,
### Basic syntax
The `hover` assertion operates on a specific location in the source text. We find the "inner-most"
expression at that position, and then query the infered type of that expression. The row to query is
identified just like any other mdtest assertion. The column to query is identified by a down arrow
(↓) in the assertion. (Note that the down arrow should always appear immediately before the `hover`
keyword in the assertion.)
expression at that position, and then query the inferred type of that expression. The row to query
is identified just like any other mdtest assertion. The column to query is identified by a down
arrow (↓) in the assertion. (Note that the down arrow should always appear immediately before the
`hover` keyword in the assertion.)
```py
def test_basic_types(parameter: int) -> None:

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crates/ty_test/src/hover.rs
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@ -25,7 +25,7 @@ pub(crate) struct HoverOutput {
}
/// Get the inferred type at a given position in a file. Returns None if no node is found at that
/// position or if the node has no infered type.
/// position or if the node has no inferred type.
///
/// This reuses much of the logic from [`ty_ide::hover`]. Unlike that function, we return types for
/// literals, which is useful for testing type inference in mdtest assertions.