# ListTestRunSourceEvents
<a name="API_ListTestRunSourceEvents"></a>

Lists the state-change events observed for a test run monitoring source. Events are returned for one source per call, in chronological order.

## Request Syntax
<a name="API_ListTestRunSourceEvents_RequestSyntax"></a>

```
GET /v2/test-runs/{{testRunId}}/source-events?maxResults={{maxResults}}&nextToken={{nextToken}}&serviceArn={{serviceArn}}&sourceArn={{sourceArn}} HTTP/1.1
```

## URI Request Parameters
<a name="API_ListTestRunSourceEvents_RequestParameters"></a>

The request uses the following URI parameters.

 ** [maxResults](#API_ListTestRunSourceEvents_RequestSyntax) **   <a name="ngresiliencehub-ListTestRunSourceEvents-request-uri-maxResults"></a>
Pagination page size.  
Valid Range: Minimum value of 1. Maximum value of 100.

 ** [nextToken](#API_ListTestRunSourceEvents_RequestSyntax) **   <a name="ngresiliencehub-ListTestRunSourceEvents-request-uri-nextToken"></a>
Pagination token.  
Length Constraints: Minimum length of 1. Maximum length of 2000.  
Pattern: `\S{1,2000}` 

 ** [serviceArn](#API_ListTestRunSourceEvents_RequestSyntax) **   <a name="ngresiliencehub-ListTestRunSourceEvents-request-uri-serviceArn"></a>
The ARN of the service the test run belongs to.  
Length Constraints: Minimum length of 31.  
Pattern: `arn:(aws|aws-cn|aws-iso|aws-iso-[a-z]{1}|aws-us-gov):[A-Za-z0-9][A-Za-z0-9_/.-]{0,62}:([a-z]{2}-((iso[a-z]{0,1}-)|(gov-)){0,1}[a-z]+-[0-9]):[0-9]{12}:[A-Za-z0-9/][A-Za-z0-9:_/+.-]{0,1023}`   
Required: Yes

 ** [sourceArn](#API_ListTestRunSourceEvents_RequestSyntax) **   <a name="ngresiliencehub-ListTestRunSourceEvents-request-uri-sourceArn"></a>
The ARN of the monitoring source to list events for, such as the ARN of a CloudWatch alarm. If the source was not monitored during the test run, the response is an empty list.  
Length Constraints: Minimum length of 31. Maximum length of 1024.  
Pattern: `arn:aws[a-zA-Z-]*:[a-z][a-z0-9-]*:[a-z]{2}(-[a-z]+)+-\d{1}:\d{12}:.+`   
Required: Yes

 ** [testRunId](#API_ListTestRunSourceEvents_RequestSyntax) **   <a name="ngresiliencehub-ListTestRunSourceEvents-request-uri-testRunId"></a>
The identifier of the test run to list source events for.  
Length Constraints: Minimum length of 1.  
Required: Yes

## Request Body
<a name="API_ListTestRunSourceEvents_RequestBody"></a>

The request does not have a request body.

## Response Syntax
<a name="API_ListTestRunSourceEvents_ResponseSyntax"></a>

```
HTTP/1.1 200
Content-type: application/json

{
   "nextToken": "string",
   "testRunSourceEvents": [ 
      { 
         "detail": { ... },
         "eventType": "string",
         "sourceArn": "string",
         "timestamp": number
      }
   ]
}
```

## Response Elements
<a name="API_ListTestRunSourceEvents_ResponseElements"></a>

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

 ** [nextToken](#API_ListTestRunSourceEvents_ResponseSyntax) **   <a name="ngresiliencehub-ListTestRunSourceEvents-response-nextToken"></a>
Pagination token.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 2000.  
Pattern: `\S{1,2000}` 

 ** [testRunSourceEvents](#API_ListTestRunSourceEvents_ResponseSyntax) **   <a name="ngresiliencehub-ListTestRunSourceEvents-response-testRunSourceEvents"></a>
The list of source events, in chronological order.  
Type: Array of [TestRunSourceEvent](API_TestRunSourceEvent.md) objects  
Array Members: Minimum number of 0 items. Maximum number of 100 items.

## Errors
<a name="API_ListTestRunSourceEvents_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** AccessDeniedException **   
Access denied — caller lacks required permissions.  
HTTP Status Code: 403

 ** InternalServerException **   
Internal service error.  
HTTP Status Code: 500

 ** ResourceNotFoundException **   
Resource not found.    
 ** resourceId **   
The identifier of the resource that was not found.  
 ** resourceType **   
The type of the resource that was not found.
HTTP Status Code: 404

 ** ValidationException **   
Validation error — invalid input parameters.    
 ** fieldList **   
The list of fields that failed validation.  
 ** reason **   
The reason for the validation failure.
HTTP Status Code: 400

## See Also
<a name="API_ListTestRunSourceEvents_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/resiliencehubv2-2026-02-17/ListTestRunSourceEvents) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/resiliencehubv2-2026-02-17/ListTestRunSourceEvents) 
+  [AWS SDK for C\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/resiliencehubv2-2026-02-17/ListTestRunSourceEvents) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/resiliencehubv2-2026-02-17/ListTestRunSourceEvents) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/resiliencehubv2-2026-02-17/ListTestRunSourceEvents) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/resiliencehubv2-2026-02-17/ListTestRunSourceEvents) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/resiliencehubv2-2026-02-17/ListTestRunSourceEvents) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/resiliencehubv2-2026-02-17/ListTestRunSourceEvents) 
+  [AWS SDK for Python (Boto3)](https://docs.aws.amazon.com/goto/boto3/resiliencehubv2-2026-02-17/ListTestRunSourceEvents) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/resiliencehubv2-2026-02-17/ListTestRunSourceEvents)