forge snapshot
Create a gas 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 gas snapshot.
By default, the comparison is done with .gas-snapshot.
--check [<SNAPSHOT_FILE>]
Compare against a pre-existing gas snapshot, exiting with code 1 if
they do not match.
Outputs a diff if the gas snapshots do not match.
By default, the comparison is done with .gas-snapshot.
--snap <FILE>
Output file for the gas snapshot
[default: .gas-snapshot]
--tolerance <SNAPSHOT_THRESHOLD>
Tolerates gas deviations up to the specified percentage
-h, --help
Print help (see a summary with '-h')
Display options:
-v, --verbosity...
Verbosity level of the log messages.
Pass multiple times to increase the verbosity (e.g. -v, -vv, -vvv).
Depending on the context the verbosity levels have different meanings.
For example, the verbosity levels of the EVM are:
- 2 (-vv): Print logs for all tests.
- 3 (-vvv): Print execution traces for failing tests.
- 4 (-vvvv): Print execution traces for all tests, and setup traces
for failing tests.
- 5 (-vvvvv): Print execution and setup traces for all tests,
including storage changes.
-q, --quiet
Do not print log messages
--json
Format log messages as JSON
--color <COLOR>
The color of the log messages
Possible values:
- auto: Intelligently guess whether to use color output (default)
- always: Force color output
- never: Force disable color output
-s, --suppress-successful-traces
Suppress successful test traces and show only traces for failures
[env: FORGE_SUPPRESS_SUCCESSFUL_TRACES=]
--junit
Output test results as JUnit XML report
-l, --list
List tests instead of running them
--show-progress
Show test execution progress
--summary
Print test summary table
--detailed
Print detailed test summary table
Test options:
-j, --threads <THREADS>
Number of threads to use. Specifying 0 defaults to the number of
logical cores
[aliases: jobs]
--debug
Run a single test in the debugger.
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.
--flamegraph
Generate a flamegraph for a single test. Implies `--decode-internal`.
A flame graph is used to visualize which functions or operations
within the smart contract are consuming the most gas overall in a
sorted manner.
--flamechart
Generate a flamechart for a single test. Implies `--decode-internal`.
A flame chart shows the gas usage over time, illustrating when each
function is called (execution order) and how much gas it consumes at
each point in the timeline.
--decode-internal
Identify internal functions in traces.
This will trace internal functions and decode stack parameters.
Parameters stored in memory (such as bytes or arrays) are currently
decoded only when a single function is matched, similarly to
`--debug`, for performance reasons.
--dump <PATH>
Dumps all debugger steps to file
--gas-report
Print a gas report
[env: FORGE_GAS_REPORT=]
--gas-snapshot-check <GAS_SNAPSHOT_CHECK>
Check gas snapshots against previous runs
[env: FORGE_SNAPSHOT_CHECK=]
[possible values: true, false]
--gas-snapshot-emit <GAS_SNAPSHOT_EMIT>
Enable/disable recording of gas snapshot results
[env: FORGE_SNAPSHOT_EMIT=]
[possible values: true, false]
--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-timeout <TIMEOUT>
Timeout for each fuzz run in seconds
[env: FOUNDRY_FUZZ_TIMEOUT=]
--fuzz-input-file <FUZZ_INPUT_FILE>
File to rerun fuzz failures from
--rerun
Re-run recorded test failures from last run. If no failure recorded
then regular test run is performed
[PATH]
The contract file you want to test, it's a shortcut for --match-path
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]
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
--create2-deployer <ADDRESS>
The CREATE2 deployer address to use, this will override the one in the
config
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:
--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
[aliases: 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
--odyssey
Whether to enable Odyssey features
Cache options:
--force
Clear the cache and artifacts folder and recompile
Build options:
--no-cache
Disable the cache
--dynamic-test-linking
Enable dynamic test linking
--eof
Whether to compile contracts to EOF bytecode
--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
--use-literal-content
Changes compilation to only use literal content and not URLs
--no-metadata
Do not append any metadata to the bytecode.
This is equivalent to setting `bytecode_hash` to `none` and
`cbor_metadata` to `false`.
--ast
Includes the AST as JSON in the compiler output
--evm-version <VERSION>
The target EVM version
--optimize [<OPTIMIZE>]
Activate the Solidity optimizer
[possible values: true, false]
--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