Tests & Assertions

This makes life easier by highlighting failing string matches in color at the appropriate place:

https://docs.rs/pretty_assertions/0.1.0/pretty_assertions/

Building

Hide warnings on build:

* RUSTFLAGS=-Awarnings  cargo build            

Dependency Tree:

* cargo tree

Build cargo with all features:

• cargo build --all-features   

          

Specifying it in Cargo.toml:

• my_lib = { git = "ssh://git@github.com/a/b.git", features = ["test_utils"], branch = "master" }
•  

Use of versions in dependencies:

```
[dependencies]
time = "0.1.12"
```
The string "0.1.12" is a semver version requirement. Since this string does not have any operators in it, it is interpreted the same way as if we had specified "^0.1.12", which is called a caret requirement. This will download 0.1.MAX not 0.1.12. If you need to specify the exact version use "=0.1.12"

Cargo lock in .gitignore:

* If you’re building a library that other projects will depend on, put Cargo.lock in your .gitignore. 

* If you’re building an executable like a command-line tool or an application, check Cargo.lock into git.