tests/multi_net: Require SSL cert file to be available for test to run.

These were missed in 2bba507148e8a751123257fa2b075c70d67e1160 because they
didn't use the `os.stat` pattern.

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

4 files changed, 16 insertions, 32 deletions

diff --git a/tests/multi_net/sslcontext_server_client.py b/tests/multi_net/sslcontext_server_client.py
index 6516de53f..fd330cee7 100644
--- a/tests/multi_net/sslcontext_server_client.py
+++ b/tests/multi_net/sslcontext_server_client.py
@@ -14,14 +14,10 @@ PORT = 8000
 certfile = "ec_cert.der"
 keyfile = "ec_key.der"
 
-try:
-    with open(certfile, "rb") as cf:
-        cert = cadata = cf.read()
-    with open(keyfile, "rb") as kf:
-        key = kf.read()
-except OSError:
-    print("SKIP")
-    raise SystemExit
+with open(certfile, "rb") as cf:
+    cert = cadata = cf.read()
+with open(keyfile, "rb") as kf:
+    key = kf.read()
 
 
 # Server
diff --git a/tests/multi_net/sslcontext_server_client_ciphers.py b/tests/multi_net/sslcontext_server_client_ciphers.py
index 3334d9d9e..7017a6f57 100644
--- a/tests/multi_net/sslcontext_server_client_ciphers.py
+++ b/tests/multi_net/sslcontext_server_client_ciphers.py
@@ -14,14 +14,10 @@ PORT = 8000
 cert = cafile = "ec_cert.der"
 key = "ec_key.der"
 
-try:
-    with open(cafile, "rb") as f:
-        cadata = f.read()
-    with open(key, "rb") as f:
-        keydata = f.read()
-except OSError:
-    print("SKIP")
-    raise SystemExit
+with open(cafile, "rb") as f:
+    cadata = f.read()
+with open(key, "rb") as f:
+    keydata = f.read()
 
 
 # Server
diff --git a/tests/multi_net/sslcontext_verify_callback.py b/tests/multi_net/sslcontext_verify_callback.py
index 74b973824..80056a586 100644
--- a/tests/multi_net/sslcontext_verify_callback.py
+++ b/tests/multi_net/sslcontext_verify_callback.py
@@ -15,14 +15,10 @@ PORT = 8000
 cert = cafile = "ec_cert.der"
 key = "ec_key.der"
 
-try:
-    with open(cafile, "rb") as f:
-        cadata = f.read()
-    with open(key, "rb") as f:
-        key = f.read()
-except OSError:
-    print("SKIP")
-    raise SystemExit
+with open(cafile, "rb") as f:
+    cadata = f.read()
+with open(key, "rb") as f:
+    key = f.read()
 
 
 def verify_callback(cert, depth):
diff --git a/tests/multi_net/tls_dtls_server_client.py b/tests/multi_net/tls_dtls_server_client.py
index a81c4cb28..ec7d7de55 100644
--- a/tests/multi_net/tls_dtls_server_client.py
+++ b/tests/multi_net/tls_dtls_server_client.py
@@ -13,14 +13,10 @@ PORT = 8000
 certfile = "ec_cert.der"
 keyfile = "ec_key.der"
 
-try:
-    with open(certfile, "rb") as cf:
-        cert = cadata = cf.read()
-    with open(keyfile, "rb") as kf:
-        key = kf.read()
-except OSError:
-    print("SKIP")
-    raise SystemExit
+with open(certfile, "rb") as cf:
+    cert = cadata = cf.read()
+with open(keyfile, "rb") as kf:
+    key = kf.read()
 
 
 # DTLS server.