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Assignment 3: Unit Testing in RUST

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ECE 421 | Exploring Software Development Domains
1
Assignment 3: Unit Testing in RUST
Tests in Rust
Rust supports writing software tests to ensure the correctness of the code. There are three styles for testing:
Unit testing, Doc testing, and Integration testing. Moreover, Rust supports specifying Dev-dependencies.
Tests are functions that are written to verify that the non-test code is running properly. The structure of a
test function typically involves some setup, run the “non-test code” you wish to test, then assert whether
the results are what we expect.
Unit tests should be combined into a test mod with the #[cfg(test)] attribute. To define test functions,
functions should be marked with the #[test] attribute before the function definition. For example, look at
the following code:
pub fn add(a: i32, b: i32) – i32 {
a + b
}
// This is a really bad adding function
#[allow(dead_code)]
fn bad_add(a: i32, b: i32) – i32 {
a – b
}
#[cfg(test)]
mod tests {
// Note this useful idiom: importing names from outer scope.
use super::*;
#[test]
fn test_add() {
assert_eq!(add(1, 2), 3);
}
#[test]
fn test_bad_add() {
// This assert would fire and test will fail.
// Please note, that private functions can be tested too!
assert_eq!(bad_add(1, 2), 3);
}
}
Tests can be run with cargo test.
$ cargo test
running 2 tests
test tests::test_bad_add … FAILED
test tests::test_add … ok
failures:
—- tests::test_bad_add stdout —-
thread ‘tests::test_bad_add’ panicked at ‘assertion failed:
`(left == right)`
ECE 421 | Exploring Software Development Domains
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left: `-1`,
right: `3`’, src/lib.rs:21:8
note: Run with `RUST_BACKTRACE=1` for a backtrace.
failures:
tests::test_bad_add
test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 0
filtered out
Question 1:
Source code: UTApp.zip
The application provides 4 test modules, question1, question2, question3, and question4.
a- Implement the functionality defined by question1 to pass all the tests in this module. Your task is
to define the functions add and subtract in the calculator.rs file.
b- Running the tests in question2.rs will pass with no problems because there no actual tests in the
file. Your task is to write the functionality defined by the tests (multiply and divide functions) and
write the tests cases for your code to test these two functions.
c- Implement the functionality defined by question3 to pass all the tests in this module. Your task is
to define the functions get_square_root in the calculator.rs file. Then write the code for the four
test functions defined in question3.
d- Implement the functionality defined by question4 to pass all the tests in this module. Your task is
to define the functions get_roots to calculate the roots for quadratic equations. Then, you need to
write the code for four tests functions defined in question4.
Question 2:
Hamcrest is a framework for defining ‘match’ rules and designing matcher objects. When writing tests, it
could be challenging to have the right balance between over-specifying the test (and making it brittle to
changes), and not specifying enough (making the test less valuable since it continues to pass even when the
thing being tested is broken).
Having a tool that allows you to pick out precisely the aspect under test and describe the values it should
have, to a controlled level of precision, helps significantly in writing tests that are “just right”. Such tests
fail when the behavior of the aspect under test deviates from the expected behavior, yet continue to pass
when minor, unrelated changes to the behavior are made.
Let us assume we have a struct for a player instance as follows:
struct Player {
id: i32,
first_name: String,
last_name: String,
ECE 421 | Exploring Software Development Domains
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}
Use the Hamcrest framework to write tests that assert that:
a- Player has a property called “first_name”.
b- Player has a property called last_name with the type String.
c- Two Players created with the same id, have the same first name and last name.
Question 3: Redo question 1 using the Hamcrest framework. Submit your code as UTApp_hamcrest.
Question 4: Combination function algorithm
a- Write a program that finds the value of the combination function, c(a, b) where a and b are both
integers taken as inputs. Combination function is defined as:
𝒄(𝒂, 𝒃) =
𝒂!
(𝒂 − 𝒃)! 𝒃!
b- Write a test that ensures both a and b are integers
c- Write tests that ensure that your code can handle the following error conditions (Hint: use
should_panic):
– a and b are not integers.
– b is not smaller than a.
Question 5: Write a tax() function that calculates the taxed income based on the following table:
Income Tax Rate (%)
0 ≤ income < 10,000 0
10,000 ≤ income < 50,000 10
50,000 ≤ income < 100,000 20
100,000 ≤ income < 1,000,000 30
Income ≥ 1,000,000 40
Write tests that ensure that your code can handle the following error conditions (Hint: use should_panic):
– Income is a negative number.
– Income is not an integer.

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