cargo-edit 0.3.1

This extends Cargo to allow you to add and remove dependencies by modifying your `Cargo.toml` file from the command line. It contains `cargo add`, `cargo rm`, and `cargo upgrade`.
Documentation 
extern crate assert_cli;

#[test]
fn invalid_manifest() {
    assert_cli::Assert::command(&[
        "target/debug/cargo-add",
        "add",
        "foo",
        "--manifest-path=tests/fixtures/manifest-invalid/Cargo.toml.sample",
    ]).fails_with(1)
        .and()
        .stderr()
        .is(
            r#"Command failed due to unhandled error: Unable to parse Cargo.toml

Caused by: Manifest not valid TOML
Caused by: TOML parse error at line 6, column 7
  |
6 | key = invalid-value
  |       ^
Unexpected `i`
Expected `digit`, `-` or `+`
expected 4 more elements
expected 2 more elements
While parsing a Time
While parsing a Date-Time
While parsing a Float
While parsing an Integer"#,
        )
        .unwrap();
}