forge snapshot
Create a snapshot of each test’s gas usage
$ forge snapshot --help
Usage: forge snapshot [OPTIONS] [PATH]
Options:
--diff [<SNAPSHOT_FILE>]
Output a diff against a pre-existing snapshot.
By default, the comparison is done with .gas-snapshot.
--check [<SNAPSHOT_FILE>]
Compare against a pre-existing snapshot, exiting with code 1 if they
do not match.
Outputs a diff if the snapshots do not match.
By default, the comparison is done with .gas-snapshot.
--snap <FILE>
Output file for the snapshot
[default: .gas-snapshot]
--tolerance <SNAPSHOT_THRESHOLD>
Tolerates gas deviations up to the specified percentage
-h, --help
Print help (see a summary with '-h')
Test options:
--debug <TEST_FUNCTION>
Run a test in the debugger.
The argument passed to this flag is the name of the test function you
want to run, and it works the same as --match-test.
If more than one test matches your specified criteria, you must add
additional filters until only one test is found (see --match-contract
and --match-path).
The matching test will be opened in the debugger regardless of the
outcome of the test.
If the matching test is a fuzz test, then it will open the debugger on
the first failure case. If the fuzz test does not fail, it will open
the debugger on the last fuzz case.
For more fine-grained control of which fuzz case is run, see forge
run.
--flamegraph
Generate a flamegraph for a single test. Implies `--decode-internal`
--flamechart
Generate a flamechart for a single test. Implies `--decode-internal`
--decode-internal [<TEST_FUNCTION>]
Whether to identify internal functions in traces.
If no argument is passed to this flag, it will trace internal
functions scope and decode stack parameters, but parameters stored in
memory (such as bytes or arrays) will not be decoded.
To decode memory parameters, you should pass an argument with a test
function name, similarly to --debug and --match-test.
If more than one test matches your specified criteria, you must add
additional filters until only one test is found (see --match-contract
and --match-path).
--gas-report
Print a gas report
[env: FORGE_GAS_REPORT=]
--allow-failure
Exit with code 0 even if a test fails
[env: FORGE_ALLOW_FAILURE=]
--fail-fast
Stop running tests after the first failure
--etherscan-api-key <KEY>
The Etherscan (or equivalent) API key
[env: ETHERSCAN_API_KEY=]
--fuzz-seed <FUZZ_SEED>
Set seed used to generate randomness during your fuzz runs
--fuzz-runs <RUNS>
[env: FOUNDRY_FUZZ_RUNS=]
--fuzz-input-file <FUZZ_INPUT_FILE>
File to rerun fuzz failures from
-j, --threads <THREADS>
Max concurrent threads to use. Default value is the number of
available CPUs
[aliases: jobs]
--show-progress
Show test execution progress
[PATH]
The contract file you want to test, it's a shortcut for --match-path
Display options:
--json
Output test results in JSON format
--junit
Output test results as JUnit XML report
-l, --list
List tests instead of running them
--summary
Print test summary table
--detailed
Print detailed test summary table
Test filtering:
--match-test <REGEX>
Only run test functions matching the specified regex pattern
[aliases: mt]
--no-match-test <REGEX>
Only run test functions that do not match the specified regex pattern
[aliases: nmt]
--match-contract <REGEX>
Only run tests in contracts matching the specified regex pattern
[aliases: mc]
--no-match-contract <REGEX>
Only run tests in contracts that do not match the specified regex
pattern
[aliases: nmc]
--match-path <GLOB>
Only run tests in source files matching the specified glob pattern
[aliases: mp]
--no-match-path <GLOB>
Only run tests in source files that do not match the specified glob
pattern
[aliases: nmp]
--no-match-coverage <REGEX>
Only show coverage for files that do not match the specified regex
pattern
[aliases: nmco]
--rerun
Re-run recorded test failures from last run. If no failure recorded
then regular test run is performed
EVM options:
-f, --fork-url <URL>
Fetch state over a remote endpoint instead of starting from an empty
state.
If you want to fetch state from a specific block number, see
--fork-block-number.
[aliases: rpc-url]
--fork-block-number <BLOCK>
Fetch state from a specific block number over a remote endpoint.
See --fork-url.
--fork-retries <RETRIES>
Number of retries.
See --fork-url.
--fork-retry-backoff <BACKOFF>
Initial retry backoff on encountering errors.
See --fork-url.
--no-storage-caching
Explicitly disables the use of RPC caching.
All storage slots are read entirely from the endpoint.
This flag overrides the project's configuration file.
See --fork-url.
--initial-balance <BALANCE>
The initial balance of deployed test contracts
--sender <ADDRESS>
The address which will be executing tests/scripts
--ffi
Enable the FFI cheatcode
--always-use-create-2-factory
Use the create 2 factory in all cases including tests and
non-broadcasting scripts
-v, --verbosity...
Verbosity of the EVM.
Pass multiple times to increase the verbosity (e.g. -v, -vv, -vvv).
Verbosity levels:
- 2: Print logs for all tests
- 3: Print execution traces for failing tests
- 4: Print execution traces for all tests, and setup traces for
failing tests
- 5: Print execution and setup traces for all tests
Fork config:
--compute-units-per-second <CUPS>
Sets the number of assumed available compute units per second for this
provider
default value: 330
See also --fork-url and
<https://docs.alchemy.com/reference/compute-units#what-are-cups-compute-units-per-second>
--no-rpc-rate-limit
Disables rate limiting for this node's provider.
See also --fork-url and
<https://docs.alchemy.com/reference/compute-units#what-are-cups-compute-units-per-second>
[aliases: no-rate-limit]
Executor environment config:
--gas-limit <GAS_LIMIT>
The block gas limit
--code-size-limit <CODE_SIZE>
EIP-170: Contract code size limit in bytes. Useful to increase this
because of tests. By default, it is 0x6000 (~25kb)
--chain <CHAIN>
The chain name or EIP-155 chain ID
[aliases: chain-id]
--gas-price <GAS_PRICE>
The gas price
--block-base-fee-per-gas <FEE>
The base fee in a block
[aliases: base-fee]
--tx-origin <ADDRESS>
The transaction origin
--block-coinbase <ADDRESS>
The coinbase of the block
--block-timestamp <TIMESTAMP>
The timestamp of the block
--block-number <BLOCK>
The block number
--block-difficulty <DIFFICULTY>
The block difficulty
--block-prevrandao <PREVRANDAO>
The block prevrandao value. NOTE: Before merge this field was mix_hash
--block-gas-limit <GAS_LIMIT>
The block gas limit
--memory-limit <MEMORY_LIMIT>
The memory limit per EVM execution in bytes. If this limit is
exceeded, a `MemoryLimitOOG` result is thrown.
The default is 128MiB.
--disable-block-gas-limit
Whether to disable the block gas limit checks
[aliases: no-gas-limit]
--isolate
Whether to enable isolation of calls. In isolation mode all top-level
calls are executed as a separate transaction in a separate EVM
context, enabling more precise gas accounting and transaction state
changes
--alphanet
Whether to enable Alphanet features
Cache options:
--force
Clear the cache and artifacts folder and recompile
Build options:
--no-cache
Disable the cache
--skip <SKIP>...
Skip building files whose names contain the given filter.
`test` and `script` are aliases for `.t.sol` and `.s.sol`.
Linker options:
--libraries <LIBRARIES>
Set pre-linked libraries
[env: DAPP_LIBRARIES=]
Compiler options:
--ignored-error-codes <ERROR_CODES>
Ignore solc warnings by error code
--deny-warnings
Warnings will trigger a compiler error
--no-auto-detect
Do not auto-detect the `solc` version
--use <SOLC_VERSION>
Specify the solc version, or a path to a local solc, to build with.
Valid values are in the format `x.y.z`, `solc:x.y.z` or
`path/to/solc`.
--offline
Do not access the network.
Missing solc versions will not be installed.
--via-ir
Use the Yul intermediate representation compilation pipeline
--no-metadata
Do not append any metadata to the bytecode.
This is equivalent to setting `bytecode_hash` to `none` and
`cbor_metadata` to `false`.
--silent
Don't print anything on startup
--ast
Includes the AST as JSON in the compiler output
--evm-version <VERSION>
The target EVM version
--optimize
Activate the Solidity optimizer
--optimizer-runs <RUNS>
The number of runs specifies roughly how often each opcode of the
deployed code will be executed across the life-time of the contract.
This means it is a trade-off parameter between code size (deploy cost)
and code execution cost (cost after deployment). An `optimizer_runs`
parameter of `1` will produce short but expensive code. In contrast, a
larger `optimizer_runs` parameter will produce longer but more gas
efficient code
--extra-output <SELECTOR>...
Extra output to include in the contract's artifact.
Example keys: evm.assembly, ewasm, ir, irOptimized, metadata
For a full description, see
<https://docs.soliditylang.org/en/v0.8.13/using-the-compiler.html#input-description>
--extra-output-files <SELECTOR>...
Extra output to write to separate files.
Valid values: metadata, ir, irOptimized, ewasm, evm.assembly
Project options:
-o, --out <PATH>
The path to the contract artifacts folder
--revert-strings <REVERT>
Revert string configuration.
Possible values are "default", "strip" (remove), "debug"
(Solidity-generated revert strings) and "verboseDebug"
--build-info
Generate build info files
--build-info-path <PATH>
Output path to directory that build info files will be written to
--root <PATH>
The project's root path.
By default root of the Git repository, if in one, or the current
working directory.
-C, --contracts <PATH>
The contracts source directory
-R, --remappings <REMAPPINGS>
The project's remappings
--remappings-env <ENV>
The project's remappings from the environment
--cache-path <PATH>
The path to the compiler cache
--lib-paths <PATH>
The path to the library folder
--hardhat
Use the Hardhat-style project layout.
This is the same as using: `--contracts contracts --lib-paths
node_modules`.
[aliases: hh]
--config-path <FILE>
Path to the config file
Watch options:
-w, --watch [<PATH>...]
Watch the given files or directories for changes.
If no paths are provided, the source and test directories of the
project are watched.
--no-restart
Do not restart the command while it's still running
--run-all
Explicitly re-run all tests when a change is made.
By default, only the tests of the last modified test file are
executed.
--watch-delay <DELAY>
File update debounce delay.
During the delay, incoming change events are accumulated and only once
the delay has passed, is an action taken. Note that this does not mean
a command will be started: if --no-restart is given and a command is
already running, the outcome of the action will be to do nothing.
Defaults to 50ms. Parses as decimal seconds by default, but using an
integer with the `ms` suffix may be more convenient.
When using --poll mode, you'll want a larger duration, or risk
overloading disk I/O.
--asc
Sort results by gas used (ascending)
--desc
Sort results by gas used (descending)
--min <MIN_GAS>
Only include tests that used more gas that the given amount
--max <MAX_GAS>
Only include tests that used less gas that the given amount