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Convert chapter 11 to use Listing component #3955

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Jun 12, 2024
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Convert chapter 11 to use Listing component #3955

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36bc7f0
Convert chapter 11 to use Listing component
bzierk Jun 12, 2024
ae41d13
Fix typo
bzierk Jun 12, 2024
30559b5
Convert 11-02 and 11-03
bzierk Jun 12, 2024
533ea47
Revert Listing to span for filename
bzierk Jun 12, 2024
ab03ebc
Include one missing `file-name` in src/ch11-01-writing-tests.md Listing
chriskrycho Jun 12, 2024
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46 changes: 20 additions & 26 deletions src/ch11-01-writing-tests.md
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ $ cd adder
The contents of the *src/lib.rs* file in your `adder` library should look like
Listing 11-1.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-1" file-name="src/lib.rs" caption="The test module and function generated automatically by `cargo new`">

<!-- manual-regeneration
cd listings/ch11-writing-automated-tests
Expand All @@ -59,8 +59,7 @@ cd ../../..
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-01/src/lib.rs}}
```

<span class="caption">Listing 11-1: The test module and function generated
automatically by `cargo new`</span>
</Listing>

For now, let’s focus solely on the `it_works()` function. Note the
`#[test]` annotation: this attribute indicates this is a test function, so the
Expand All @@ -76,12 +75,13 @@ passes.
The `cargo test` command runs all tests in our project, as shown in Listing
11-2.

<Listing number="11-2" caption="The output from running the automatically generated test">

```console
{{#include ../listings/ch11-writing-automated-tests/listing-11-01/output.txt}}
```

<span class="caption">Listing 11-2: The output from running the automatically
generated test</span>
</Listing>

Cargo compiled and ran the test. We see the line `running 1 test`. The next
line shows the name of the generated test function, called `it_works`, and that
Expand Down Expand Up @@ -133,24 +133,24 @@ marked as failed. In Chapter 9, we talked about how the simplest way to panic
is to call the `panic!` macro. Enter the new test as a function named
`another`, so your *src/lib.rs* file looks like Listing 11-3.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-3" file-name="src/lib.rs" caption="Adding a second test that will fail because we call the `panic!` macro">

```rust,panics,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-03/src/lib.rs:here}}
```

<span class="caption">Listing 11-3: Adding a second test that will fail because
we call the `panic!` macro</span>
</Listing>

Run the tests again using `cargo test`. The output should look like Listing
11-4, which shows that our `exploration` test passed and `another` failed.

<Listing number="11-4" caption="Test results when one test passes and one test fails">

```console
{{#include ../listings/ch11-writing-automated-tests/listing-11-03/output.txt}}
```

<span class="caption">Listing 11-4: Test results when one test passes and one
test fails</span>
</Listing>

Instead of `ok`, the line `test tests::another` shows `FAILED`. Two new
sections appear between the individual results and the summary: the first
Expand Down Expand Up @@ -182,29 +182,27 @@ In Chapter 5, Listing 5-15, we used a `Rectangle` struct and a `can_hold`
method, which are repeated here in Listing 11-5. Let’s put this code in the
*src/lib.rs* file, then write some tests for it using the `assert!` macro.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-5" file-name="src/lib.rs" caption="The `Rectangle` struct and its `can_hold` method from Chapter 5">

```rust,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-05/src/lib.rs:here}}
```

<span class="caption">Listing 11-5: Using the `Rectangle` struct and its
`can_hold` method from Chapter 5</span>
</Listing>

The `can_hold` method returns a Boolean, which means it’s a perfect use case
for the `assert!` macro. In Listing 11-6, we write a test that exercises the
`can_hold` method by creating a `Rectangle` instance that has a width of 8 and
a height of 7 and asserting that it can hold another `Rectangle` instance that
has a width of 5 and a height of 1.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-6" file-name="src/lib.rs" caption="A test for `can_hold` that checks whether a larger rectangle can indeed hold a smaller rectangle">

```rust,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-06/src/lib.rs:here}}
```

<span class="caption">Listing 11-6: A test for `can_hold` that checks whether a
larger rectangle can indeed hold a smaller rectangle</span>
</Listing>

Note that we’ve added a new line inside the `tests` module: `use super::*;`.
The `tests` module is a regular module that follows the usual visibility rules
Expand Down Expand Up @@ -276,14 +274,13 @@ expression, without printing the values that led to the `false` value.
In Listing 11-7, we write a function named `add_two` that adds `2` to its
parameter, then we test this function using the `assert_eq!` macro.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-7" file-name="src/lib.rs" caption="Testing the function `add_two` using the `assert_eq!` macro">

```rust,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-07/src/lib.rs}}
```

<span class="caption">Listing 11-7: Testing the function `add_two` using the
`assert_eq!` macro</span>
</Listing>

Let’s check that it passes!

Expand Down Expand Up @@ -361,7 +358,6 @@ For example, let’s say we have a function that greets people by name and we
want to test that the name we pass into the function appears in the output:

<span class="filename">Filename: src/lib.rs</span>

```rust,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/no-listing-05-greeter/src/lib.rs}}
```
Expand Down Expand Up @@ -421,14 +417,13 @@ inside the function doesn’t panic.
Listing 11-8 shows a test that checks that the error conditions of `Guess::new`
happen when we expect them to.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-8" file-name="src/lib.rs" caption="Testing that a condition will cause a `panic!`">

```rust,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-08/src/lib.rs}}
```

<span class="caption">Listing 11-8: Testing that a condition will cause a
`panic!`</span>
</Listing>

We place the `#[should_panic]` attribute after the `#[test]` attribute and
before the test function it applies to. Let’s look at the result when this test
Expand Down Expand Up @@ -464,14 +459,13 @@ consider the modified code for `Guess` in Listing 11-9 where the `new` function
panics with different messages depending on whether the value is too small or
too large.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-9" file-name="src/lib.rs" caption="Testing for a `panic!` with a panic message containing a specified substring">

```rust,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-09/src/lib.rs:here}}
```

<span class="caption">Listing 11-9: Testing for a `panic!` with a panic message
containing a specified substring</span>
</Listing>

This test will pass because the value we put in the `should_panic` attribute’s
`expected` parameter is a substring of the message that the `Guess::new`
Expand Down
10 changes: 4 additions & 6 deletions src/ch11-02-running-tests.md
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Expand Up @@ -58,14 +58,13 @@ printed to standard output with the rest of the failure message.
As an example, Listing 11-10 has a silly function that prints the value of its
parameter and returns 10, as well as a test that passes and a test that fails.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-10" file-name="src/lib.rs" caption="Tests for a function that calls `println!`">

```rust,panics,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-10/src/lib.rs}}
```

<span class="caption">Listing 11-10: Tests for a function that calls
`println!`</span>
</Listing>

When we run these tests with `cargo test`, we’ll see the following output:

Expand Down Expand Up @@ -102,14 +101,13 @@ or names of the test(s) you want to run as an argument.
To demonstrate how to run a subset of tests, we’ll first create three tests for
our `add_two` function, as shown in Listing 11-11, and choose which ones to run.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-11" file-name="src/lib.rs" caption="Three tests with three different names">

```rust,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-11/src/lib.rs}}
```

<span class="caption">Listing 11-11: Three tests with three different
names</span>
</Listing>

If we run the tests without passing any arguments, as we saw earlier, all the
tests will run in parallel:
Expand Down
9 changes: 4 additions & 5 deletions src/ch11-03-test-organization.md
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Expand Up @@ -58,13 +58,13 @@ impossible to test private functions. Regardless of which testing ideology you
adhere to, Rust’s privacy rules do allow you to test private functions.
Consider the code in Listing 11-12 with the private function `internal_adder`.

<span class="filename">Filename: src/lib.rs</span>
<Listing number="11-12" file-name="src/lib.rs" caption="Testing a private function">

```rust,noplayground
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-12/src/lib.rs}}
```

<span class="caption">Listing 11-12: Testing a private function</span>
</Listing>

Note that the `internal_adder` function is not marked as `pub`. Tests are just
Rust code, and the `tests` module is just another module. As we discussed in
Expand Down Expand Up @@ -108,14 +108,13 @@ adder

Enter the code in Listing 11-13 into the *tests/integration_test.rs* file:

<span class="filename">Filename: tests/integration_test.rs</span>
<Listing number="11-13" file-name="tests/integration_test.rs" caption="An integration test of a function in the `adder` crate">

```rust,ignore
{{#rustdoc_include ../listings/ch11-writing-automated-tests/listing-11-13/tests/integration_test.rs}}
```

<span class="caption">Listing 11-13: An integration test of a function in the
`adder` crate</span>
</Listing>

Each file in the `tests` directory is a separate crate, so we need to bring our
library into each test crate’s scope. For that reason we add `use
Expand Down