Fix/verification/start sms empty options

src/Sinch/Verification/SinchVerification.cs

@@ -158,18 +158,23 @@ public async Task<StartSmsVerificationResponse> StartSms(StartSmsVerificationReq
                 };
             }
 
+            SmsOptions? options = null;
+            if (request.CodeType != null || request.Expiry != null || request.Template != null)
+            {
+                options = new SmsOptions()
+                {
+                    CodeType = request.CodeType,
+                    Expiry = request.Expiry,
+                    Template = request.Template
+                };
+            }
             var result = await Start(new StartVerificationRequest
             {
                 Custom = request.Custom,
                 Identity = request.Identity,
                 Method = request.Method,
                 Reference = request.Reference,
-                SmsOptions = new SmsOptions()
-                {
-                    CodeType = request.CodeType,
-                    Expiry = request.Expiry,
-                    Template = request.Template
-                }
+                SmsOptions = options
             }, cancellationToken, headers: headers);
             return result as StartSmsVerificationResponse ??
                    throw new InvalidOperationException($"{nameof(StartSmsVerificationResponse)} result is null.");

tests/Sinch.Tests/e2e/Verification/VerificationStartTests.cs

@@ -80,11 +80,7 @@ public async Task StartSmsVerification()
                 Custom = "456",
                 Reference = "123",
                 Method = VerificationMethodEx.Sms,
-                Identity = new Identity
-                {
-                    Endpoint = "+49000000",
-                    Type = IdentityType.Number
-                }
+                Identity = Identity.Number("+49000000")
             };
 
             var response = await VerificationClient.Verification.StartSms(new StartSmsVerificationRequest
@@ -118,6 +114,37 @@ public async Task StartSmsVerification()
             });
         }
 
+        [Fact]
+        public async Task StartSmsVerificationNoOptions()
+        {
+            var response = await VerificationClient.Verification.StartSms(new StartSmsVerificationRequest
+            {
+                Custom = "456",
+                Reference = "123",
+                Identity = Identity.Number("+49000000"),
+                AcceptLanguage = "en-US"
+            });
+            response.Should().BeEquivalentTo(new StartSmsVerificationResponse
+            {
+                Id = "123",
+                Method = VerificationMethodEx.Sms,
+                Sms = new SmsInfo
+                {
+                    Template = "{{CODE}} - to access all secrets",
+                    InterceptionTimeout = 32
+                },
+                Links = new List<Links>
+                {
+                    new()
+                    {
+                        Method = "put",
+                        Href = "href",
+                        Rel = "status"
+                    }
+                }
+            });
+        }
+
         [Fact]
         public async Task StartFlashCallVerification()
         {