RUBY-886 Add test for default cert store

Author: estolfo

spec/mongo/socket/ssl_spec.rb

@@ -67,6 +67,27 @@
       end
     end
 
+    context 'when a CA certificate is not provided', if: running_ssl? && testing_locally? do
+
+      let(:options) do
+        {
+            :ssl => true,
+            :ssl_cert => CLIENT_PEM,
+            :ssl_key => CLIENT_PEM,
+            :ssl_verify => true
+        }
+      end
+
+      before do
+        ENV['SSL_CERT_FILE']= CA_PEM
+        socket.connect!
+      end
+
+      it 'uses the default cert store' do
+        expect(socket).to be_alive
+      end
+    end
+
     context 'when ssl_verify is not specified' do
 
       let(:options) do

spec/support/certificates/client.pem

@@ -32,13 +32,13 @@ Certificate:
                     6e:a7
                 Exponent: 65537 (0x10001)
         X509v3 extensions:
-            X509v3 Basic Constraints: 
+            X509v3 Basic Constraints:
                 CA:FALSE
-            Netscape Comment: 
+            Netscape Comment:
                 OpenSSL Generated Certificate
-            X509v3 Subject Key Identifier: 
+            X509v3 Subject Key Identifier:
                 4A:8B:EE:22:42:E6:F8:62:4C:86:38:8D:C5:78:95:98:C1:10:05:7C
-            X509v3 Authority Key Identifier: 
+            X509v3 Authority Key Identifier:
                 keyid:07:41:19:3A:9F:7E:C5:B7:22:4E:B7:BC:D5:DF:E4:FC:09:B8:64:16
 
     Signature Algorithm: sha1WithRSAEncryption