tests/run-multitests.py: Change to dir of test script when running it.

This matches the behaviour of run-tests.py, which sets cwd to the directory
containing the test script, which helps to isolate the filesystem.

It means that the SSL tests no longer need to know the name of their
containing directory to find the certificate files, and helps to run these
tests on bare-metal.

Signed-off-by: Damien George <damien@micropython.org>

tests/multi_net/asyncio_tls_server_client.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/rsa_cert.der"
+cert = cafile = "rsa_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/multi_net/asyncio_tls_server_client_cert_required_error.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/rsa_cert.der"
+cert = cafile = "rsa_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/multi_net/asyncio_tls_server_client_readline.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/rsa_cert.der"
+cert = cafile = "rsa_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/multi_net/asyncio_tls_server_client_verify_error.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/rsa_cert.der"
+cert = cafile = "rsa_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/multi_net/ssl_cert_rsa.py

@@ -10,8 +10,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-certfile = "multi_net/rsa_cert.der"
+certfile = "rsa_cert.der"
-keyfile = "multi_net/rsa_key.der"
+keyfile = "rsa_key.der"
 
 try:
     os.stat(certfile)

tests/multi_net/sslcontext_check_hostname_error.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/rsa_cert.der"
+cert = cafile = "rsa_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/multi_net/sslcontext_getpeercert.py

@@ -12,8 +12,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/rsa_cert.der"
+cert = cafile = "rsa_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/multi_net/sslcontext_server_client.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-certfile = "multi_net/rsa_cert.der"
+certfile = "rsa_cert.der"
-keyfile = "multi_net/rsa_key.der"
+keyfile = "rsa_key.der"
 
 try:
     os.stat(certfile)

tests/multi_net/sslcontext_server_client_ciphers.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/rsa_cert.der"
+cert = cafile = "rsa_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/multi_net/sslcontext_server_client_files.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/rsa_cert.der"
+cert = cafile = "rsa_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/multi_net/sslcontext_verify_error.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/rsa_cert.der"
+cert = cafile = "rsa_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/multi_net/sslcontext_verify_time_error.py

@@ -11,8 +11,8 @@ except ImportError:
 PORT = 8000
 
 # These are test certificates. See tests/README.md for details.
-cert = cafile = "multi_net/expired_cert.der"
+cert = cafile = "expired_cert.der"
-key = "multi_net/rsa_key.der"
+key = "rsa_key.der"
 
 try:
     os.stat(cafile)

tests/run-multitests.py

@@ -27,13 +27,15 @@ import pyboard
 
 if os.name == "nt":
     CPYTHON3 = os.getenv("MICROPY_CPYTHON3", "python3.exe")
-    MICROPYTHON = os.getenv(
+    MICROPYTHON = os.path.abspath(
-        "MICROPY_MICROPYTHON", test_dir + "/../ports/windows/build-standard/micropython.exe"
+        os.getenv(
+            "MICROPY_MICROPYTHON", test_dir + "/../ports/windows/build-standard/micropython.exe"
+        )
     )
 else:
     CPYTHON3 = os.getenv("MICROPY_CPYTHON3", "python3")
-    MICROPYTHON = os.getenv(
+    MICROPYTHON = os.path.abspath(
-        "MICROPY_MICROPYTHON", test_dir + "/../ports/unix/build-standard/micropython"
+        os.getenv("MICROPY_MICROPYTHON", test_dir + "/../ports/unix/build-standard/micropython")
     )
 
 # For diff'ing test output
@@ -155,6 +157,7 @@ class PyInstance:
 class PyInstanceSubProcess(PyInstance):
     def __init__(self, argv, env=None):
         self.argv = argv
+        self.cwd = None
         self.env = {n: v for n, v in (i.split("=") for i in env)} if env else None
         self.popen = None
         self.finished = True
@@ -163,8 +166,9 @@ class PyInstanceSubProcess(PyInstance):
         return self.argv[0].rsplit("/")[-1]
 
     def prepare_script_from_file(self, filename, prepend, append):
-        # Make tests run in an isolated environment (i.e. `import io` would
+        # Make tests run in the directory of the test file, and in an isolated environment
-        # otherwise get the `tests/io` directory).
+        # (i.e. `import io` would otherwise get the `tests/io` directory).
+        self.cwd = os.path.dirname(filename)
         remove_cwd_from_sys_path = b"import sys\nsys.path.remove('')\n\n"
         return remove_cwd_from_sys_path + super().prepare_script_from_file(
             filename, prepend, append
@@ -179,6 +183,7 @@ class PyInstanceSubProcess(PyInstance):
                 stdout=subprocess.PIPE,
                 stderr=subprocess.STDOUT,
                 input=script,
+                cwd=self.cwd,
                 env=self.env,
             )
             output = p.stdout
@@ -192,6 +197,7 @@ class PyInstanceSubProcess(PyInstance):
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
             stderr=subprocess.STDOUT,
+            cwd=self.cwd,
             env=self.env,
         )
         self.finished = False