Cleanup test_emscripten_thread_sleep. NFC (#26637)

- Rename file
- clang-format
- Consistent naming and usage of emscripten_out

Author: sbc100

test/pthread/emscripten_thread_sleep.c

@@ -0,0 +1,41 @@
+#include <assert.h>
+#include <emscripten.h>
+#include <emscripten/console.h>
+#include <emscripten/threading.h>
+#include <pthread.h>
+#include <stdio.h>
+
+void do_sleep(double msecs) {
+  double t1 = emscripten_get_now();
+  emscripten_thread_sleep(msecs);
+  double t2 = emscripten_get_now();
+  emscripten_outf("emscripten_thread_sleep() slept for %f msecs.\n", t2 - t1);
+
+  assert(t2 - t1 >= 0.9 * msecs); // Should have slept ~ the requested time.
+}
+
+void* thread_main(void* arg) {
+  emscripten_out("hello from thread!");
+
+  do_sleep(1);
+  do_sleep(10);
+  do_sleep(100);
+  do_sleep(1000);
+  do_sleep(5000);
+
+  emscripten_force_exit(0);
+  return NULL;
+}
+
+int main() {
+  // Bad bad bad to sleep on the main thread, but test that it works.
+  do_sleep(1);
+  do_sleep(10);
+  do_sleep(100);
+  do_sleep(1000);
+  do_sleep(5000);
+  pthread_t thread;
+  pthread_create(&thread, NULL, thread_main, NULL);
+  emscripten_exit_with_live_runtime();
+  __builtin_trap();
+}

test/pthread/test_emscripten_thread_sleep.c

@@ -4815,7 +4815,7 @@ def test_unicode_html_shell(self):
 
   # Tests the functionality of the emscripten_thread_sleep() function.
   def test_emscripten_thread_sleep(self):
-    self.btest_exit('pthread/emscripten_thread_sleep.c', cflags=['-pthread'])
+    self.btest_exit('pthread/test_emscripten_thread_sleep.c', cflags=['-pthread'])
 
   # Tests that Emscripten-compiled applications can be run from a relative path in browser that is different than the address of the current page
   def test_browser_run_from_different_directory(self):