fix(lsp): nil error on RustLsp! testables if no previous testable

CHANGELOG.md

@@ -6,12 +6,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [4.2.1] - 2024-01-30
 
 ### Fixed
 
 - LSP: Only advertise `rust-analyzer.debugSingle` command capability
   if nvim-dap is installed.
+- LSP: `nil` error if running `:RustLsp! testables` and there is no
+  previous testable.
 
 ## [4.2.0] - 2024-01-30
 

lua/rustaceanvim/cached_commands.lua

@@ -50,7 +50,7 @@ M.execute_last_testable = function()
   if action then
     runnables.run_command(action.choice, action.runnables)
   else
-    runnables.runnables()
+    runnables.runnables { tests_only = true }
   end
 end
 

lua/rustaceanvim/runnables.lua

@@ -124,7 +124,7 @@ end
 ---@param opts? RunnablesOpts
 function M.runnables(executableArgsOverride, opts)
   ---@type RunnablesOpts
-  opts = vim.tbl_deep_extend('force', { tests_only = false }, opts)
+  opts = vim.tbl_deep_extend('force', { tests_only = false }, opts or {})
   vim.lsp.buf_request(0, 'experimental/runnables', get_params(), mk_handler(executableArgsOverride, opts))
 end