Document how we run multithreaded debugger tests. (#86325)

diff --git a/src/mono/wasm/threads.md b/src/mono/wasm/threads.md
index f47a54d6a809e2ffdf7a8d850f2fcd552f0f6194..71801749b0d8a9f11d1eaf88e5bc279b7618b331 100644 (file)
--- a/src/mono/wasm/threads.md
+++ b/src/mono/wasm/threads.md
@@ -84,3 +84,10 @@ The runtime has a number of tasks that are scheduled with `mono_threads_schedule
 
 The background tasks will run on the main thread.  Calling `mono_threads_schedule_background_job` on
 a worker thread will use `async_run_in_main_thread` to queue up work for the main thread.
+
+## Debugger tests ##
+
+Debugger supports multithreading when the runtime is built with `WasmEnableThreads=true`. To run the debugger tests in multithreading mode we use:
+```
+dotnet test src/mono/wasm/debugger/DebuggerTestSuite -e RuntimeConfiguration=Debug -e Configuration=Debug -e DebuggerHost=chrome -e WasmEnableThreads=true -e WASM_TESTS_USING_VARIANT=multithreaded
+```
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