Add test for argument parsing for subprocess (PY-20476 )

python/testData/debug/test_multiprocess_args.py

@@ -0,0 +1,15 @@
+import time
+import multiprocessing
+import subprocess
+import sys
+import os
+
+
+def run(name):
+    dir_path = os.path.dirname(os.path.realpath(__file__))
+    subprocess.Popen(('%s' % sys.executable, os.path.join(dir_path, "test_remote.py"), name, "etc etc"))
+
+if __name__ == '__main__':
+    multiprocessing.Process(target=run, args=("subprocess",)).start()
+    while True:
+        time.sleep(0.1)

python/testSrc/com/jetbrains/env/python/PythonDebuggerTest.java

@@ -699,6 +699,37 @@ public class PythonDebuggerTest extends PyEnvTestCase {
     });
   }
 
+  @Test
+  @Staging
+  public void testMultiprocessingSubprocess() throws Exception {
+    runPythonTest(new PyDebuggerTask("/debug", "test_multiprocess_args.py") {
+      @Override
+      protected void init() {
+        setMultiprocessDebug(true);
+      }
+
+      @Override
+      public void before() throws Exception {
+        toggleBreakpoint(getFilePath("test_remote.py"), 2);
+      }
+
+      @Override
+      public void testing() throws Exception {
+        waitForPause();
+        eval("sys.argv[1]").hasValue("'subprocess'");
+        eval("sys.argv[2]").hasValue("'etc etc'");
+
+        resume();
+      }
+
+      @NotNull
+      @Override
+      public Set<String> getTags() {
+        return ImmutableSet.of("-iron", "-jython"); //can't run on iron and jython
+      }
+    });
+  }
+
   @Test
   @Staging
   public void testPyQtQThreadInheritor() throws Exception {