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Copyright (c) 2020, Andinus <andinus@inventati.org>

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-11-22 03:19:01 +0000
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# Getting Started

These exercises lean on Test-Driven Development (TDD), but they're not
an exact match.

The following steps assume that you are in the same directory as the exercise.

You must have Rust installed.
Follow the [Installation chapter in the Rust book](https://doc.rust-lang.org/book/ch01-01-installation.html).
The [Rust language section](http://exercism.io/languages/rust)
section from exercism is also useful.

## Step 1

Run the test suite. It can be run with `cargo`, which is installed with Rust.

```sh
$ cargo test
```

This will compile the `hello-world` crate and run the test, which fails.

```sh
running 1 test
test test_hello_world ... FAILED

failures:

---- test_hello_world stdout ----
thread 'test_hello_world' panicked at 'assertion failed: `(left == right)`
(left: `"Hello, World!"`, right: `"Goodbye, World!"`)', tests/hello-world.rs:5

failures:
    test_hello_world

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured
```

### Understanding Test Failures

The `test_hello_world` failure states that it is expecting the value,
`"Hello, World!"`, to be returned from `hello()`.
The left side of the assertion (at line 5) should be equal to the right side.

```sh
---- test_hello_world stdout ----
thread 'test_hello_world' panicked at 'assertion failed: `(left == right)`
(left: `"Hello, World!"`, right: `"Goodbye, World!"`)', tests/hello-world.rs:5
```

### Fixing the Error

To fix it, open up `src/lib.rs` and change the `hello` function to return
`"Hello, World!"` instead of `"Goodbye, World!"`.

```rust
pub fn hello() -> &'static str {
    "Hello, World!"
}
```

## Step 2

Run the test again. This time, it will pass.

```sh
running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured

     Running target/debug/deps/hello_world-bd1f06dc726ef14f

running 1 test
test test_hello_world ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured

   Doc-tests hello-world

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured
```

## Submit

Once the test is passing, you can submit your code with the following
command:

```sh
$ exercism submit src/lib.rs
```
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-11-22 03:18:59 +0000