sccache 0.14.0

Sccache is a ccache-like tool. It is used as a compiler wrapper and avoids compilation when possible. Sccache has the capability to utilize caching in remote storage environments, including various cloud storage options, or alternatively, in local storage.
Documentation 
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//! Tests for sccache args.
//!
//! Any copyright is dedicated to the Public Domain.
//! http://creativecommons.org/publicdomain/zero/1.0/
pub mod helpers;

use anyhow::Result;
use assert_cmd::prelude::*;
use helpers::{SCCACHE_BIN, stop_sccache};
use predicates::prelude::*;
use serial_test::serial;
use std::process::Command;

#[macro_use]
extern crate log;

#[test]
#[serial]
#[cfg(feature = "gcs")]
fn test_gcp_arg_check() -> Result<()> {
    trace!("sccache with log");
    stop_sccache()?;

    let mut cmd = Command::new(SCCACHE_BIN.as_os_str());
    cmd.arg("--start-server")
        .env("SCCACHE_LOG", "debug")
        .env("SCCACHE_GCS_KEY_PATH", "foo.json");

    cmd.assert().failure().stderr(predicate::str::contains(
        "If setting GCS credentials, SCCACHE_GCS_BUCKET",
    ));

    stop_sccache()?;

    let mut cmd = Command::new(SCCACHE_BIN.as_os_str());
    cmd.arg("--start-server")
        .env("SCCACHE_LOG", "debug")
        .env("SCCACHE_GCS_OAUTH_URL", "http://127.0.0.1");

    cmd.assert().failure().stderr(predicate::str::contains(
        "If setting GCS credentials, SCCACHE_GCS_BUCKET",
    ));

    stop_sccache()?;
    let mut cmd = Command::new(SCCACHE_BIN.as_os_str());
    cmd.arg("--start-server")
        .env("SCCACHE_LOG", "debug")
        .env("SCCACHE_GCS_BUCKET", "b")
        .env("SCCACHE_GCS_CREDENTIALS_URL", "not_valid_url//127.0.0.1")
        .env("SCCACHE_GCS_KEY_PATH", "foo.json");

    // This is just a warning
    cmd.assert()
        .failure()
        .stderr(predicate::str::contains("gcs credential url is invalid"));

    Ok(())
}

#[test]
#[serial]
#[cfg(feature = "s3")]
fn test_s3_invalid_args() -> Result<()> {
    stop_sccache()?;

    let mut cmd = Command::new(SCCACHE_BIN.as_os_str());
    cmd.arg("--start-server")
        .env("SCCACHE_LOG", "debug")
        .env("SCCACHE_BUCKET", "test")
        .env("SCCACHE_REGION", "us-east-1")
        .env("AWS_ACCESS_KEY_ID", "invalid_ak")
        .env("AWS_SECRET_ACCESS_KEY", "invalid_sk");

    cmd.assert()
        .failure()
        .stderr(predicate::str::contains("cache storage failed to read"));

    Ok(())
}