Style errors fix and test fix

Author: Franziska Geiger

graalpython/com.oracle.graal.python.test/src/tests/test_posix.py

@@ -75,7 +75,8 @@ def test_execl(self):
     def test_execv_with_env(self):
         new_file_path, cwd = self.create_file()
         with open(new_file_path, 'w') as script:
-                script.write('echo $ENV_VAR> {}/test.txt\n'.format(cwd))
+            script.write('#!/bin/sh\n')
+            script.write('echo $ENV_VAR > {}/test.txt\n'.format(cwd))
         os.system("%s -c \"import os; os.environ['ENV_VAR']='the_text'; os.execv('%s', ['%s', 'the_input'])\"" % (sys.executable, new_file_path, new_file_path))
         assert os.path.isfile(cwd + '/test.txt')
         with open(cwd+'/test.txt', 'r') as result:

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/PosixModuleBuiltins.java

@@ -335,7 +335,7 @@ Object doExecute(PythonModule thisModule, String path, PSequence args) {
                 ProcessBuilder builder = new ProcessBuilder(cmd);
                 Map<String, String> environment = builder.environment();
                 environ.entries().forEach(entry -> {
-                    environment.put(new String(toBytes.execute(null, (PBytes) entry.key)), new String(toBytes.execute(null, (PBytes) entry.value)));
+                    environment.put(new String(toBytes.execute(null, entry.key)), new String(toBytes.execute(null, entry.value)));
                 });
                 Process pr = builder.start();
                 BufferedReader bfr = new BufferedReader(new InputStreamReader(pr.getInputStream()));