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# core::starknet::testing::set_block_hash

Set the hash for a block.

## Signature

```rust theme={null}
pub fn set_block_hash(block_number: u64, value: felt252)
```

#### Arguments

`block_number` - The targeted block number.
`value` - The block hash to set.
After a call to `set_block_hash`, `starknet::syscalls::get_block_hash_syscall` for the
block\_number will return the set value.
Unset blocks values call would fail.