Add LSP request and VSCode command

crates/rust-analyzer/src/lsp_ext.rs

@@ -177,6 +177,26 @@ pub struct CargoRunnable {
     pub expect_test: Option<bool>,
 }
 
+pub enum RelatedTests {}
+
+impl Request for RelatedTests {
+    type Params = RelatedTestsParams;
+    type Result = Vec<TestInfo>;
+    const METHOD: &'static str = "rust-analyzer/relatedTests";
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct RelatedTestsParams {
+    #[serde(flatten)]
+    pub text_document_position: lsp_types::TextDocumentPositionParams,
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct TestInfo {
+    pub runnable: Runnable,
+}
+
 pub enum InlayHints {}
 
 impl Request for InlayHints {