[Home](./index.md) > [@contract-case/case-boundary](./case-boundary.md) > [BoundaryFailureKindConstants](./case-boundary.boundaryfailurekindconstants.md)
## BoundaryFailureKindConstants class
Constants to use for determining what kind of failure you have
**Signature:**
```typescript
export declare class BoundaryFailureKindConstants
```
## Properties
| Property | Modifiers | Type | Description |
| ---------------------------------------------------------------------------------------------------------- | ------------------------------------------------------ | ------ | ---------------------------------------------------------------------------------- |
| [CASE_BROKER_ERROR](./case-boundary.boundaryfailurekindconstants.case_broker_error.md) | static
readonly
| string | An error while contacting a contract broker |
| [CASE_CONFIGURATION_ERROR](./case-boundary.boundaryfailurekindconstants.case_configuration_error.md) | static
readonly
| string | The user has configured ContractCase incorrectly |
| [CASE_CORE_ERROR](./case-boundary.boundaryfailurekindconstants.case_core_error.md) | static
readonly
| string | Something went wrong in ContractCase internals. Almost certainly a bug. |
| [CASE_FAILED_ASSERTION_ERROR](./case-boundary.boundaryfailurekindconstants.case_failed_assertion_error.md) | static
readonly
| string | The test's expectations were not met |
| [CASE_TRIGGER_ERROR](./case-boundary.boundaryfailurekindconstants.case_trigger_error.md) | static
readonly
| string | The user-provided trigger failed when it was not expected to do so |
| [CASE_VERIFY_RETURN_ERROR](./case-boundary.boundaryfailurekindconstants.case_verify_return_error.md) | static
readonly
| string | The user-provided verification function (testResponse or testErrorResponse) failed |