# Assertion
<a name="testing-language-actions-assertion"></a>

Validates that a specific attribute or value in the flow matches expected criteria.

## Parameters
<a name="testing-language-actions-assertion-parameters"></a>
+ Identifier: Unique identifier for the action
+ Type: Must be `Assert`
+ Parameters:
  + Namespace: JSON path to the attribute value to check
  + Operator: Comparison operator to use (see [Supported operators](#testing-language-actions-assertion-operators))
  + Operand: Expected value to compare against
+ Transitions
  + NextAction: The unique identifier for the next action

## Supported operators
<a name="testing-language-actions-assertion-operators"></a>
+ Equals: Exact match
+ TextStartsWith: Text begins with the operand
+ TextEndsWith: Text ends with the operand
+ TextContains: Text contains the operand
+ NumberGreaterThan: Numeric value is greater than operand
+ NumberGreaterOrEqualTo: Numeric value is greater than or equal to operand
+ NumberLessThan: Numeric value is less than operand
+ NumberLessOrEqualTo: Numeric value is less than or equal to operand
+ Exists: Checks if the attribute exists (operand not required)

```
{
   "Identifier" : "ActionId",
   "Type" : "Assert",
   "Parameters" : {
       "Namespace" : "string", // Data path to fetch
       "Operator": "string", // Comparasion operator 
       "Operand" : "string" // Expected Value to compare
   }
    "Transitions": { "NextAction": "string" }
}
```