tests: add hover tests for const generics

crates/ide/src/hover/tests.rs

@@ -2958,6 +2958,106 @@ struct ST<const C: usize, T = Foo>
     );
 }
 
+#[test]
+fn const_generic_positive_i8_literal() {
+    check(
+        r#"
+struct Const<const N: i8>;
+
+fn main() {
+    let v$0alue = Const::<1>;
+}
+"#,
+        expect![[r#"
+            *value*
+
+            ```rust
+            let value: Const<1>
+            ```
+        "#]],
+    );
+}
+
+#[test]
+fn const_generic_zero_i8_literal() {
+    check(
+        r#"
+struct Const<const N: i8>;
+
+fn main() {
+    let v$0alue = Const::<0>;
+}
+"#,
+        expect![[r#"
+            *value*
+
+            ```rust
+            let value: Const<0>
+            ```
+        "#]],
+    );
+}
+
+#[test]
+fn const_generic_negative_i8_literal() {
+    check(
+        r#"
+struct Const<const N: i8>;
+
+fn main() {
+    let v$0alue = Const::<-1>;
+}
+"#,
+        expect![[r#"
+            *value*
+
+            ```rust
+            let value: Const<-1>
+            ```
+        "#]],
+    );
+}
+
+#[test]
+fn const_generic_bool_literal() {
+    check(
+        r#"
+struct Const<const F: bool>;
+
+fn main() {
+    let v$0alue = Const::<true>;
+}
+"#,
+        expect![[r#"
+            *value*
+
+            ```rust
+            let value: Const<true>
+            ```
+        "#]],
+    );
+}
+
+#[test]
+fn const_generic_char_literal() {
+    check(
+        r#"
+struct Const<const C: char>;
+
+fn main() {
+    let v$0alue = Const::<'🦀'>;
+}
+"#,
+        expect![[r#"
+            *value*
+
+            ```rust
+            let value: Const<'🦀'>
+            ```
+        "#]],
+    );
+}
+
 #[test]
 fn hover_self_param_shows_type() {
     check(