laboratory

A simple, expressive unit test framework for Rust

Features

• before, beforeeach, after, aftereach hooks
• Different reporter options
• Reports test durations
• The use of custom assertion libraries
• Exclude tests
• Nested test suites
• The use of state
• should panic testing
• Console highlighting

Installation

In Cargo.toml: toml [dev-dependencies] laboratory = "*" Then in your test files ```rust

[cfg(test)]

mod tests { use laboratory::{describe, describeskip, it, itskip, it_only, expect}; } ```

Getting Started

Testing a simple function "add_one()"

```rust

fn main() { add_one(0); }

fn add_one (x: u64) -> u64 { x + 1 }

[cfg(test)]

mod tests {

use super::*;
use laboratory::{describe, it, expect};

#[test]
fn suite() {

    describe("add_one()").specs(vec![

        it("should return 1", |_| {
            expect(add_one(0)).to_equal(1)
        }),

        it("should return 2", |_| {
            expect(add_one(1)).to_equal(2)
        })

    ]).run();

}

}

```

Then run: ```shell script $ cargo test -- --nocapture

```

Result:
``` running 1 test

add_one() ✓ should return 1 (0ms) ✓ should return 2 (0ms)

✓ 2 tests completed (0ms)

test tests::suite ... ok

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

Nested suites

```rust

struct Foo { bar: String, baz: i32 }

impl Foo { pub fn new() -> Foo { Foo { bar: String::new(), baz: 0 } } pub fn append(&mut self, str: &str) { self.bar += str; } pub fn increase(&mut self) { self.baz += 1; } }

fn main () { let mut foo = Foo::new(); foo.append("fizzbuzz"); foo.increase(); }

[cfg(test)]

mod tests {

// get the test suite
use laboratory::{describe, it, expect};

// get the Foo struct
use super::*;

// define single test
#[test]
fn test() {

    describe("Foo").suites(vec![

        describe("#new()").specs(vec![

            it("should return foo with two members", |_| {

                let result = Foo::new();
                expect(result.bar).to_be(String::new())?;
                expect(result.baz).to_equal(0)?;
                Ok(())

            })

        ]),

        describe("#append()").specs(vec![

            it("should append fizzbuzz to Foo#bar", |_| {
                let mut foo = Foo::new();
                foo.append("fizzbuzz");
                expect(foo.bar).to_be("fizzbuzz".to_string())
            })

        ]),

        describe("#increase()").specs(vec![

            it("should increase Foo#baz by 1", |_| {
                let mut foo = Foo::new();
                foo.increase();
                expect(foo.baz).to_equal(1)
            })

        ])

    ])
    .run();

}

}

Result: textmate running 1 test

Foo #new() ✓ should return foo with two members (0ms) #append() ✓ should append fizzbuzz to Foo#bar (0ms) #increase() ✓ should increase Foo#baz by 1 (0ms)

✓ 3 tests completed (0ms)

test tests::test ... ok

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

Failed Tests

```rust

// addone should add one to any number, but a typo results in 6 being added fn addone (n: i32) -> i32 { n + 6 }

fn add_two (n: i32) -> i32 { n + 2 }

fn main () { addone(0); addtwo(0); }

[cfg(test)]

mod tests {

use laboratory::{describe,it,expect};
use super::*;

#[test]
fn test() {

    describe("Package").suites(vec![

        describe("add_one()").specs(vec![

            it("should return 1 to when given 0", |_| {
                expect(add_one(0)).to_equal(1)
            })

        ]),

        describe("add_two()").specs(vec![

            it("should return 2 to when given 0", |_| {
                expect(add_two(0)).to_equal(2)
            })

        ])

    ]).run();

}

}

```

Result: ```textmate

running 1 test

Package addone() 0) should return 1 to when given 0 (0ms) addtwo() ✓ should return 2 to when given 0 (0ms)

✖ 1 of 2 tests failed:

0) add_one() should return 1 to when given 0: Expected 6 to equal 1

test tests::test ... ok

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

```

Hooks

```rust

fn no_op() -> bool { true }

fn main() { no_op(); }

[cfg(test)]

mod tests {

use super::no_op;
use laboratory::{describe, it, expect};

#[test]
fn test() {

    describe("no_op").before_all(|_| {
        println!("\n\n  before hook called");
    }).before_each(|_| {
        println!("  before_each hook called");
    }).after_each(|_| {
        println!("  after_each hook called");
    }).after_all(|_| {
        println!("  after_all hook called");
    }).specs(vec![

        it("should do nothing", |_| {
            expect(no_op()).to_be(true)
        }),

        it("should do nothing again", |_| {
            expect(no_op()).to_be(true)
        })

    ]).run();

}

}

Result: running 1 test

before hook called beforeeach hook called aftereach hook called beforeeach hook called aftereach hook called after_all hook called

no_op ✓ should do nothing (0ms) ✓ should do nothing again (0ms)

✓ 2 tests completed (0ms)

test tests::test ... ok

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

Using State

```rust

fn noop() -> bool { true } fn addone(n: i32) -> i32 { n + 1 } fn add_two(n: i32) -> i32 { n + 2 }

fn main() { noop(); addone(0); }

[cfg(test)]

mod tests {

use super::*;
use laboratory::{describe, it, expect, Deserialize, Serialize, State};
use std::fmt::{Debug};
use crate::add_one;

// We want a counter to count each time a hook or test is called
// Any state we want to use in the suite must be able to be serialized and deserialized by serde
#[derive(Deserialize, Serialize, Debug)]
struct Counter {
    // the counter will hold a member for each category
    pub before_all_hit_count: u8,
    pub before_each_hit_count: u8,
    pub after_each_hit_count: u8,
    pub after_all_hit_count: u8,
    pub test_hit_count: u8
}
impl Counter {
    fn new() -> Counter {
        Counter {
            before_all_hit_count: 0,
            before_each_hit_count: 0,
            after_each_hit_count: 0,
            after_all_hit_count: 0,
            test_hit_count: 0
        }
    }
}

#[test]
fn test() {

    fn update_before_all(state: &mut State) {
        let mut counter: Counter = state.get_state();
        counter.before_all_hit_count += 1;
        state.set_state(counter);
    }
    fn update_before_each(state: &mut State) {
        let mut counter: Counter = state.get_state();
        counter.before_each_hit_count += 1;
        state.set_state(counter);
    }
    fn update_after_each(state: &mut State) {
        let mut counter: Counter = state.get_state();
        counter.after_each_hit_count += 1;
        state.set_state(counter);
    }
    fn update_after_all(state: &mut State) {
        let mut counter: Counter = state.get_state();
        counter.after_all_hit_count += 1;
        // println!("\n\n{:#?}", &counter);
        state.set_state(counter);
    }
    fn update_test(state: &mut State) {
        let mut counter: Counter = state.get_state();
        counter.test_hit_count += 1;
        state.set_state(counter);
    }

    let state: Counter = describe("no_op")
        .state(Counter::new())
        .before_all(update_before_all)
        .before_each(update_before_each)
        .after_each(update_after_each)
        .after_all(update_after_all)
        .suites(vec![

            // this suite will inherit the parent suite's state
            describe("add_one()")
                .before_all(update_before_all)
                .before_each(update_before_each)
                .after_each(update_after_each)
                .after_all(update_after_all)
                .specs(vec![

                    it("should return 1", |state| {
                        update_test(state);
                        expect(add_one(0)).to_be(1)
                    }),

                    it("should return 2", |state| {
                        update_test(state);
                        expect(add_one(1)).to_be(2)
                    })

                ])
                .inherit_state(),

            // it will use its own state
            describe("add_two()")
                .state(Counter::new())
                .before_all(update_before_all)
                .before_each(update_before_each)
                .after_each(update_after_each)
                .after_all(update_after_all)
                .specs(vec![

                    it("should return 2", |state| {
                        update_test(state);
                        expect(add_two(0)).to_be(2)
                    }),

                    it("should return 4", |state| {
                        update_test(state);
                        expect(add_two(2)).to_be(4)
                    })

                ])


        ])
        .specs(vec![

            it("should do nothing", |state| {
                update_test(state);
                expect(no_op()).to_be(true)
            }),

            it("should do nothing again", |state| {
                update_test(state);
                expect(no_op()).to_be(true)
            })

        ]).run().to_state();

    println!("{:#?}\n\n", state);

}

}

Result: running 1 test

noop ✓ should do nothing (0ms) ✓ should do nothing again (0ms) addone() ✓ should return 1 (0ms) ✓ should return 2 (0ms) add_two() ✓ should return 2 (0ms) ✓ should return 4 (0ms)

✓ 6 tests completed (0ms)

Counter { beforeallhitcount: 2, beforeeachhitcount: 4, aftereachhitcount: 4, afterallhitcount: 2, testhitcount: 4, }

test tests::test ... ok

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

Testing Large Packages Divided by Modules

```rust

fn main() { addone::addone(0); multiplybytwo::multiplybytwo(1); }

pub mod add_one {

pub fn add_one (x: u64) -> u64 { x + 1 }

#[cfg(test)]
pub mod tests {

    use super::*;
    use laboratory::{describe, it, expect, Suite};
    pub fn suite() -> Suite {

        describe("add_one()").specs(vec![

            it("should return 1", |_| {
                expect(add_one(0)).to_equal(1)
            }),

            it("should return 2", |_| {
                expect(add_one(1)).to_equal(2)
            })

        ])

    }

}

} pub mod multiplybytwo {

pub fn multiply_by_two (x: u64) -> u64 { x * 2 }

#[cfg(test)]
pub mod tests {

    use super::*;
    use laboratory::{describe, it, expect, Suite};
    pub fn suite() -> Suite {

        describe("multiply_by_two()").specs(vec![

            it("should return 2", |_| {
                expect(multiply_by_two(1)).to_equal(2)
            }),

            it("should return 4", |_| {
                expect(multiply_by_two(2)).to_equal(4)
            })

        ])

    }

}

}

[cfg(test)]

mod tests { use super::*; use laboratory::{describe};

#[test]
fn test() {

    describe("Package").suites(vec![

        add_one::tests::suite(),
        multiply_by_two::tests::suite()

    ]).run();

}

}

Result: running 1 test

Package addone() ✓ should return 1 (0ms) ✓ should return 2 (0ms) multiplyby_two() ✓ should return 2 (0ms) ✓ should return 4 (0ms)

✓ 4 tests completed (0ms)

test tests::test ... ok

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

Optional Reporting Styles: Spec, Minimum, JSON, and JSON-Pretty

```rust fn main() { addone(0); addtwo(0); }

fn addone (x: u64) -> u64 { x + 1 } fn addtwo (x: u64) -> u64 { x + 5 }

[cfg(test)]

mod tests {

use super::*;
use laboratory::{describe, it, expect};

#[test]
fn suite() {

    describe("Package").suites(vec![

        describe("add_one()").specs(vec![

            it("should return 1", |_| {
                expect(add_one(0)).to_equal(1)
            }),

            it("should return 2", |_| {
                expect(add_one(1)).to_equal(2)
            })

        ]),

        describe("add_two()").specs(vec![

            it("should return 2", |_| {
                expect(add_two(0)).to_equal(2)
            })

        ])

    ]).json_pretty().run();

}

} Result: running 1 test

{ "name": "Package", "passing": 2, "failing": 1, "ignored": 0, "childsuites": [ { "name": "addone()", "passing": 2, "failing": 0, "ignored": 0, "childsuites": [], "childtests": [ { "name": "should return 1", "fullname": "addone() should return 1", "pass": true, "errormsg": null, "duration": 0 }, { "name": "should return 2", "fullname": "addone() should return 2", "pass": true, "errormsg": null, "duration": 0 } ], "duration": 0 }, { "name": "addtwo()", "passing": 0, "failing": 1, "ignored": 0, "childsuites": [], "childtests": [ { "name": "should return 2", "fullname": "addtwo() should return 2", "pass": false, "errormsg": "Expected 5 to equal 2", "duration": 0 } ], "duration": 0 } ], "child_tests": [], "duration": 0 }

test tests::suite ... ok

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