Add LSP request and VSCode command

crates/rust-analyzer/src/handlers.rs

@@ -607,6 +607,24 @@ pub(crate) fn handle_runnables(
     Ok(res)
 }
 
+pub(crate) fn handle_related_tests(
+    snap: GlobalStateSnapshot,
+    params: lsp_ext::RelatedTestsParams,
+) -> Result<Vec<lsp_ext::TestInfo>> {
+    let _p = profile::span("handle_related_tests");
+    let position = from_proto::file_position(&snap, params.text_document_position)?;
+
+    let tests = snap.analysis.related_tests(position, None)?;
+    let mut res = Vec::new();
+    for it in tests {
+        if let Ok(runnable) = to_proto::runnable(&snap, it) {
+            res.push(lsp_ext::TestInfo { runnable })
+        }
+    }
+
+    Ok(res)
+}
+
 pub(crate) fn handle_completion(
     snap: GlobalStateSnapshot,
     params: lsp_types::CompletionParams,

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 {

crates/rust-analyzer/src/main_loop.rs

@@ -500,6 +500,7 @@ impl GlobalState {
             .on::<lsp_ext::ExpandMacro>(handlers::handle_expand_macro)
             .on::<lsp_ext::ParentModule>(handlers::handle_parent_module)
             .on::<lsp_ext::Runnables>(handlers::handle_runnables)
+            .on::<lsp_ext::RelatedTests>(handlers::handle_related_tests)
             .on::<lsp_ext::InlayHints>(handlers::handle_inlay_hints)
             .on::<lsp_ext::CodeActionRequest>(handlers::handle_code_action)
             .on::<lsp_ext::CodeActionResolveRequest>(handlers::handle_code_action_resolve)