add regression test

Author: kevinAlbs

mongo/options/clientoptions_test.go

@@ -538,6 +538,11 @@ func TestClientOptions(t *testing.T) {
 				baseClient().SetSRVMaxHosts(2).
 					SetHosts([]string{"localhost.test.build.10gen.cc:27017", "localhost.test.build.10gen.cc:27018"}),
 			},
+			{
+				"GODRIVER-2263 regression test",
+				"mongodb://localhost/?tlsCertificateKeyFile=testdata/Drivers-Testing-Client-Intermediate-combined.pem",
+				baseClient().SetTLSConfig(&tls.Config{Certificates: make([]tls.Certificate, 1)}),
+			},
 		}
 
 		for _, tc := range testCases {

mongo/options/testdata/Drivers-Testing-Client-Intermediate-combined.pem

@@ -0,0 +1,78 @@
+This .pem file includes the following:
+- Private Key
+- Certificate 1 for Private Key
+- Certificate 2 for Issuer of Certificate 1.
+
+This .pem file was created from test certificates from:
+https://x509gen.corp.mongodb.com/#/cert/5ce5b21a42a0ef0008b11399
+
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAgqdjbfumni3Z8A7q2TpVvk1XAHAT/LGsNOEZ/Ksuypv+q3BK
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+-----END RSA PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----