Fix client test to check for certificate instead of exit code

s_client may return non-zero when peer verification fails (no CA
bundle loaded), but the connection still succeeds and the server
certificate is printed to stdout. Assert on the certificate being
present rather than requiring exit code 0.

Author: julek-wolfssl

tests/client/client-test.py

@@ -29,19 +29,18 @@ def test_s_client_x509(self):
         self.addCleanup(lambda: os.remove(tmp_crt)
                         if os.path.exists(tmp_crt) else None)
 
-        # Run s_client with empty stdin so it connects then disconnects
-        try:
-            s_client = subprocess.run(
-                [WOLFSSL_BIN, "s_client", "-connect", "www.google.com:443"],
-                input=b"\n",
-                capture_output=True,
-                timeout=30,
-            )
-        except (subprocess.TimeoutExpired, OSError):
-            self.skipTest("s_client connection timed out or failed")
-
-        if s_client.returncode != 0 or not s_client.stdout:
-            self.skipTest("s_client could not connect (no network?)")
+        # Run s_client with empty stdin so it connects then disconnects.
+        # Verification may fail without a CA bundle, but the connection
+        # still succeeds and the server certificate is printed to stdout.
+        s_client = subprocess.run(
+            [WOLFSSL_BIN, "s_client", "-connect", "www.google.com:443"],
+            input=b"\n",
+            capture_output=True,
+            timeout=30,
+        )
+
+        self.assertIn(b"-----BEGIN CERTIFICATE-----", s_client.stdout,
+                      f"s_client did not return a certificate: {s_client.stderr}")
 
         # Pipe s_client stdout into x509 to extract the cert as PEM
         x509_extract = subprocess.run(