Struct Execs

pub struct Execs {

    pub(crate) ran: bool,
    pub(crate) process_builder: Option<ProcessBuilder>,
    pub(crate) expect_stdin: Option<String>,
    pub(crate) expect_exit_code: Option<i32>,
    pub(crate) expect_stdout_data: Option<Data>,
    pub(crate) expect_stderr_data: Option<Data>,
    pub(crate) expect_stdout_contains: Vec<String>,
    pub(crate) expect_stderr_contains: Vec<String>,
    pub(crate) expect_stdout_not_contains: Vec<String>,
    pub(crate) expect_stderr_not_contains: Vec<String>,
    pub(crate) expect_stderr_with_without: Vec<(Vec<String>, Vec<String>)>,
    pub(crate) stream_output: bool,
    pub(crate) assert: Assert,
}

Run and verify a ProcessBuilder

Construct with

• execs
• cargo_process
• Project methods

Fields

ran: bool

process_builder: Option<ProcessBuilder>

expect_stdin: Option<String>

expect_exit_code: Option<i32>

expect_stdout_data: Option<Data>

expect_stderr_data: Option<Data>

expect_stdout_contains: Vec<String>

expect_stderr_contains: Vec<String>

expect_stdout_not_contains: Vec<String>

expect_stderr_not_contains: Vec<String>

expect_stderr_with_without: Vec<(Vec<String>, Vec<String>)>

stream_output: bool

assert: Assert

Implementations

impl Execs

pub fn with_process_builder(self, p: ProcessBuilder) -> Execs

impl Execs

Configure assertions

pub fn with_stdout_data(&mut self, expected: impl IntoData) -> &mut Self

Verifies that stdout is equal to the given lines.

See compare::assert_e2e for assertion details.

Prefer passing in str! for expected to get snapshot updating.

If format! is needed for content that changes from run to run that you don’t care about, consider whether you could have compare::assert_e2e redact the content. If nothing else, a wildcard ([..], ...) may be useful.

However, "" may be preferred for intentionally empty output so people don’t accidentally bless a change.

Examples

use cargo_test_support::prelude::*;
use cargo_test_support::str;
use cargo_test_support::execs;

execs().with_stdout_data(str![r#"
Hello world!
"#]);

Non-deterministic compiler output

use cargo_test_support::prelude::*;
use cargo_test_support::str;
use cargo_test_support::execs;

execs().with_stdout_data(str![r#"
[COMPILING] foo
[COMPILING] bar
"#].unordered());

jsonlines

use cargo_test_support::prelude::*;
use cargo_test_support::str;
use cargo_test_support::execs;

execs().with_stdout_data(str![r#"
[
  {},
  {}
]
"#].is_json().against_jsonlines());

pub fn with_stderr_data(&mut self, expected: impl IntoData) -> &mut Self

Verifies that stderr is equal to the given lines.

See compare::assert_e2e for assertion details.

Prefer passing in str! for expected to get snapshot updating.

If format! is needed for content that changes from run to run that you don’t care about, consider whether you could have compare::assert_e2e redact the content. If nothing else, a wildcard ([..], ...) may be useful.

However, "" may be preferred for intentionally empty output so people don’t accidentally bless a change.

Examples

use cargo_test_support::prelude::*;
use cargo_test_support::str;
use cargo_test_support::execs;

execs().with_stderr_data(str![r#"
Hello world!
"#]);

Non-deterministic compiler output

use cargo_test_support::prelude::*;
use cargo_test_support::str;
use cargo_test_support::execs;

execs().with_stderr_data(str![r#"
[COMPILING] foo
[COMPILING] bar
"#].unordered());

jsonlines

use cargo_test_support::prelude::*;
use cargo_test_support::str;
use cargo_test_support::execs;

execs().with_stderr_data(str![r#"
[
  {},
  {}
]
"#].is_json().against_jsonlines());

pub fn with_stdin<S: ToString>(&mut self, expected: S) -> &mut Self

Writes the given lines to stdin.

pub fn with_status(&mut self, expected: i32) -> &mut Self

Verifies the exit code from the process.

This is not necessary if the expected exit code is 0.

pub fn without_status(&mut self) -> &mut Self

Removes exit code check for the process.

By default, the expected exit code is 0.

pub fn with_stdout_contains<S: ToString>(&mut self, expected: S) -> &mut Self

Verifies that stdout contains the given contiguous lines somewhere in its output.

See compare for supported patterns.

Prefer Execs::with_stdout_data where possible.

• expected cannot be snapshotted
• expected can end up being ambiguous, causing the assertion to succeed when it should fail

pub fn with_stderr_contains<S: ToString>(&mut self, expected: S) -> &mut Self

Verifies that stderr contains the given contiguous lines somewhere in its output.

See compare for supported patterns.

Prefer Execs::with_stderr_data where possible.

• expected cannot be snapshotted
• expected can end up being ambiguous, causing the assertion to succeed when it should fail

pub fn with_stdout_does_not_contain<S: ToString>( &mut self, expected: S, ) -> &mut Self

Verifies that stdout does not contain the given contiguous lines.

See compare for supported patterns.

See note on Self::with_stderr_does_not_contain.

Prefer Execs::with_stdout_data where possible.

• expected cannot be snapshotted
• The absence of expected can either mean success or that the string being looked for changed.

To mitigate this, consider matching this up with Execs::with_stdout_contains.

pub fn with_stderr_does_not_contain<S: ToString>( &mut self, expected: S, ) -> &mut Self

Verifies that stderr does not contain the given contiguous lines.

See compare for supported patterns.

Prefer Execs::with_stdout_data where possible.

• expected cannot be snapshotted
• The absence of expected can either mean success or that the string being looked for changed.

To mitigate this, consider either matching this up with Execs::with_stdout_contains or replace it with Execs::with_stderr_line_without.

pub fn with_stderr_line_without<S: ToString>( &mut self, with: &[S], without: &[S], ) -> &mut Self

Verify that a particular line appears in stderr with and without the given substrings. Exactly one line must match.

The substrings are matched as contains.

Prefer Execs::with_stdout_data where possible.

• with cannot be snapshotted
• The absence of `without`` can either mean success or that the string being looked for changed.

Example

use cargo_test_support::execs;

execs().with_stderr_line_without(
    &[
        "[RUNNING] `rustc --crate-name build_script_build",
        "-C opt-level=3",
    ],
    &["-C debuginfo", "-C incremental"],
);

This will check that a build line includes -C opt-level=3 but does not contain -C debuginfo or -C incremental.

impl Execs

Configure the process

pub fn stream(&mut self) -> &mut Self

Forward subordinate process stdout/stderr to the terminal. Useful for printf debugging of the tests. CAUTION: CI will fail if you leave this in your test!

pub fn arg<T: AsRef<OsStr>>(&mut self, arg: T) -> &mut Self

pub fn args<T: AsRef<OsStr>>(&mut self, args: &[T]) -> &mut Self

pub fn cwd<T: AsRef<OsStr>>(&mut self, path: T) -> &mut Self

pub fn env<T: AsRef<OsStr>>(&mut self, key: &str, val: T) -> &mut Self

pub fn env_remove(&mut self, key: &str) -> &mut Self

pub fn masquerade_as_nightly_cargo(&mut self, reasons: &[&str]) -> &mut Self

Enables nightly features for testing

The list of reasons should be why nightly cargo is needed. If it is because of an unstable feature put the name of the feature as the reason, e.g. &["print-im-a-teapot"]

pub fn replace_crates_io(&mut self, url: &Url) -> &mut Self

Overrides the crates.io URL for testing.

Can be used for testing crates-io functionality where alt registries cannot be used.

pub fn overlay_registry(&mut self, url: &Url, path: &str) -> &mut Self

pub fn enable_split_debuginfo_packed(&mut self) -> &mut Self

pub fn enable_mac_dsym(&mut self) -> &mut Self

impl Execs

Run and verify the process

pub fn exec_with_output(&mut self) -> Result<Output>

pub fn build_command(&mut self) -> Command

pub fn run(&mut self)

pub fn run_json(&mut self) -> Value

Runs the process, checks the expected output, and returns the first JSON object on stdout.

pub fn run_output(&mut self, output: &Output)

pub(crate) fn verify_checks_output(&self, stdout: &[u8], stderr: &[u8])

pub(crate) fn match_process( &self, process: &ProcessBuilder, ) -> Result<RawOutput>

pub(crate) fn match_output( &self, code: Option<i32>, stdout: &[u8], stderr: &[u8], ) -> Result<()>

Trait Implementations

impl Clone for Execs

fn clone(&self) -> Execs

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Drop for Execs

fn drop(&mut self)

Executes the destructor for this type.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 704 bytes