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<h1 id="testing-cursors"><a class="header" href="#testing-cursors">Testing Cursors</a></h1>
<p>是时候找出我在上一节中犯了多少令人尴尬的错误了！</p>
<p>哦，天哪，我们的 API 既不像标准版，也不像旧版。好吧，那我打算从这两个地方拼凑一些东西吧。是的，让我们 &quot;借用 &quot; 标准版中的这些测试：</p>
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span> #[test]
fn test_cursor_move_peek() {
let mut m: LinkedList&lt;u32&gt; = LinkedList::new();
m.extend([1, 2, 3, 4, 5, 6]);
let mut cursor = m.cursor_mut();
cursor.move_next();
assert_eq!(cursor.current(), Some(&amp;mut 1));
assert_eq!(cursor.peek_next(), Some(&amp;mut 2));
assert_eq!(cursor.peek_prev(), None);
assert_eq!(cursor.index(), Some(0));
cursor.move_prev();
assert_eq!(cursor.current(), None);
assert_eq!(cursor.peek_next(), Some(&amp;mut 1));
assert_eq!(cursor.peek_prev(), Some(&amp;mut 6));
assert_eq!(cursor.index(), None);
cursor.move_next();
cursor.move_next();
assert_eq!(cursor.current(), Some(&amp;mut 2));
assert_eq!(cursor.peek_next(), Some(&amp;mut 3));
assert_eq!(cursor.peek_prev(), Some(&amp;mut 1));
assert_eq!(cursor.index(), Some(1));
let mut cursor = m.cursor_mut();
cursor.move_prev();
assert_eq!(cursor.current(), Some(&amp;mut 6));
assert_eq!(cursor.peek_next(), None);
assert_eq!(cursor.peek_prev(), Some(&amp;mut 5));
assert_eq!(cursor.index(), Some(5));
cursor.move_next();
assert_eq!(cursor.current(), None);
assert_eq!(cursor.peek_next(), Some(&amp;mut 1));
assert_eq!(cursor.peek_prev(), Some(&amp;mut 6));
assert_eq!(cursor.index(), None);
cursor.move_prev();
cursor.move_prev();
assert_eq!(cursor.current(), Some(&amp;mut 5));
assert_eq!(cursor.peek_next(), Some(&amp;mut 6));
assert_eq!(cursor.peek_prev(), Some(&amp;mut 4));
assert_eq!(cursor.index(), Some(4));
}
#[test]
fn test_cursor_mut_insert() {
let mut m: LinkedList&lt;u32&gt; = LinkedList::new();
m.extend([1, 2, 3, 4, 5, 6]);
let mut cursor = m.cursor_mut();
cursor.move_next();
cursor.splice_before(Some(7).into_iter().collect());
cursor.splice_after(Some(8).into_iter().collect());
// check_links(&amp;m);
assert_eq!(m.iter().cloned().collect::&lt;Vec&lt;_&gt;&gt;(), &amp;[7, 1, 8, 2, 3, 4, 5, 6]);
let mut cursor = m.cursor_mut();
cursor.move_next();
cursor.move_prev();
cursor.splice_before(Some(9).into_iter().collect());
cursor.splice_after(Some(10).into_iter().collect());
check_links(&amp;m);
assert_eq!(m.iter().cloned().collect::&lt;Vec&lt;_&gt;&gt;(), &amp;[10, 7, 1, 8, 2, 3, 4, 5, 6, 9]);
/* remove_current not impl'd
let mut cursor = m.cursor_mut();
cursor.move_next();
cursor.move_prev();
assert_eq!(cursor.remove_current(), None);
cursor.move_next();
cursor.move_next();
assert_eq!(cursor.remove_current(), Some(7));
cursor.move_prev();
cursor.move_prev();
cursor.move_prev();
assert_eq!(cursor.remove_current(), Some(9));
cursor.move_next();
assert_eq!(cursor.remove_current(), Some(10));
check_links(&amp;m);
assert_eq!(m.iter().cloned().collect::&lt;Vec&lt;_&gt;&gt;(), &amp;[1, 8, 2, 3, 4, 5, 6]);
*/
let mut m: LinkedList&lt;u32&gt; = LinkedList::new();
m.extend([1, 8, 2, 3, 4, 5, 6]);
let mut cursor = m.cursor_mut();
cursor.move_next();
let mut p: LinkedList&lt;u32&gt; = LinkedList::new();
p.extend([100, 101, 102, 103]);
let mut q: LinkedList&lt;u32&gt; = LinkedList::new();
q.extend([200, 201, 202, 203]);
cursor.splice_after(p);
cursor.splice_before(q);
check_links(&amp;m);
assert_eq!(
m.iter().cloned().collect::&lt;Vec&lt;_&gt;&gt;(),
&amp;[200, 201, 202, 203, 1, 100, 101, 102, 103, 8, 2, 3, 4, 5, 6]
);
let mut cursor = m.cursor_mut();
cursor.move_next();
cursor.move_prev();
let tmp = cursor.split_before();
assert_eq!(m.into_iter().collect::&lt;Vec&lt;_&gt;&gt;(), &amp;[]);
m = tmp;
let mut cursor = m.cursor_mut();
cursor.move_next();
cursor.move_next();
cursor.move_next();
cursor.move_next();
cursor.move_next();
cursor.move_next();
cursor.move_next();
let tmp = cursor.split_after();
assert_eq!(tmp.into_iter().collect::&lt;Vec&lt;_&gt;&gt;(), &amp;[102, 103, 8, 2, 3, 4, 5, 6]);
check_links(&amp;m);
assert_eq!(m.iter().cloned().collect::&lt;Vec&lt;_&gt;&gt;(), &amp;[200, 201, 202, 203, 1, 100, 101]);
}
fn check_links&lt;T&gt;(_list: &amp;LinkedList&lt;T&gt;) {
// would be good to do this!
}
<span class="boring">}</span></code></pre></pre>
<p>见证奇迹的时候！</p>
<pre><code class="language-text">cargo test
Compiling linked-list v0.0.3
Finished test [unoptimized + debuginfo] target(s) in 1.03s
Running unittests src\lib.rs
running 14 tests
test test::test_basic_front ... ok
test test::test_basic ... ok
test test::test_debug ... ok
test test::test_iterator_mut_double_end ... ok
test test::test_ord ... ok
test test::test_cursor_move_peek ... FAILED
test test::test_cursor_mut_insert ... FAILED
test test::test_iterator ... ok
test test::test_mut_iter ... ok
test test::test_eq ... ok
test test::test_rev_iter ... ok
test test::test_iterator_double_end ... ok
test test::test_hashmap ... ok
test test::test_ord_nan ... ok
failures:
---- test::test_cursor_move_peek stdout ----
thread 'test::test_cursor_move_peek' panicked at 'assertion failed: `(left == right)`
left: `None`,
right: `Some(1)`', src\lib.rs:1079:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
---- test::test_cursor_mut_insert stdout ----
thread 'test::test_cursor_mut_insert' panicked at 'assertion failed: `(left == right)`
left: `[200, 201, 202, 203, 10, 100, 101, 102, 103, 7, 1, 8, 2, 3, 4, 5, 6, 9]`,
right: `[200, 201, 202, 203, 1, 100, 101, 102, 103, 8, 2, 3, 4, 5, 6]`', src\lib.rs:1153:9
failures:
test::test_cursor_move_peek
test::test_cursor_mut_insert
test result: FAILED. 12 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
</code></pre>
<p>我得承认，我在这里有些自负，希望自己能成功。这就是我们写测试的原因（但也许我只是在移植测试时做得不好？）</p>
<p>第一次失败是什么？</p>
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>let mut m: LinkedList&lt;u32&gt; = LinkedList::new();
m.extend([1, 2, 3, 4, 5, 6]);
let mut cursor = m.cursor_mut();
cursor.move_next();
assert_eq!(cursor.current(), Some(&amp;mut 1));
assert_eq!(cursor.peek_next(), Some(&amp;mut 2));
assert_eq!(cursor.peek_prev(), None);
assert_eq!(cursor.index(), Some(0));
cursor.move_prev();
assert_eq!(cursor.current(), None);
assert_eq!(cursor.peek_next(), Some(&amp;mut 1)); // DIES HERE
<span class="boring">}</span></code></pre></pre>
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn peek_next(&amp;mut self) -&gt; Option&lt;&amp;mut T&gt; {
unsafe {
self.cur
.and_then(|node| (*node.as_ptr()).back)
.map(|node| &amp;mut (*node.as_ptr()).elem)
}
}
<span class="boring">}</span></code></pre></pre>
<p>就是这错了。如果 <code>self.cur</code> 是 None, 我们不应该就这样放弃，我们还需要检查 self.list.front，因为我们在幽灵节点上！因此，我们只需在链中添加一个 or_else：</p>
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn peek_next(&amp;mut self) -&gt; Option&lt;&amp;mut T&gt; {
unsafe {
self.cur
.and_then(|node| (*node.as_ptr()).back)
.or_else(|| self.list.front)
.map(|node| &amp;mut (*node.as_ptr()).elem)
}
}
pub fn peek_prev(&amp;mut self) -&gt; Option&lt;&amp;mut T&gt; {
unsafe {
self.cur
.and_then(|node| (*node.as_ptr()).front)
.or_else(|| self.list.back)
.map(|node| &amp;mut (*node.as_ptr()).elem)
}
}
<span class="boring">}</span></code></pre></pre>
<p>这样就修复好了吗？</p>
<pre><code class="language-text">---- test::test_cursor_move_peek stdout ----
thread 'test::test_cursor_move_peek' panicked at 'assertion failed: `(left == right)`
left: `Some(6)`,
right: `None`', src\lib.rs:1078:9
</code></pre>
<p>又错了。好吧，显然这比我想象的要难得多。盲目地把这些情况串联起来简直是一场灾难，让我们对幽灵节点与非幽灵节点的情况做不同的判断吧：</p>
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn peek_next(&amp;mut self) -&gt; Option&lt;&amp;mut T&gt; {
unsafe {
let next = if let Some(cur) = self.cur {
// Normal case, try to follow the cur node's back pointer
(*cur.as_ptr()).back
} else {
// Ghost case, try to use the list's front pointer
self.list.front
};
// Yield the element if the next node exists
next.map(|node| &amp;mut (*node.as_ptr()).elem)
}
}
pub fn peek_prev(&amp;mut self) -&gt; Option&lt;&amp;mut T&gt; {
unsafe {
let prev = if let Some(cur) = self.cur {
// Normal case, try to follow the cur node's front pointer
(*cur.as_ptr()).front
} else {
// Ghost case, try to use the list's back pointer
self.list.back
};
// Yield the element if the prev node exists
prev.map(|node| &amp;mut (*node.as_ptr()).elem)
}
}
<span class="boring">}</span></code></pre></pre>
<p>我对这一次充满信心！</p>
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
</span>
<span class="boring">fn main() {
</span> cargo test
Compiling linked-list v0.0.3
Finished test [unoptimized + debuginfo] target(s) in 0.70s
Running unittests src\lib.rs
running 14 tests
test test::test_basic_front ... ok
test test::test_basic ... ok
test test::test_cursor_move_peek ... ok
test test::test_eq ... ok
test test::test_cursor_mut_insert ... ok
test test::test_iterator ... ok
test test::test_iterator_double_end ... ok
test test::test_ord_nan ... ok
test test::test_mut_iter ... ok
test test::test_hashmap ... ok
test test::test_debug ... ok
test test::test_ord ... ok
test test::test_iterator_mut_double_end ... ok
test test::test_rev_iter ... ok
test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
Doc-tests linked-list
running 1 test
test src\lib.rs - assert_properties::iter_mut_invariant (line 803) - compile fail ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.12s
<span class="boring">}</span></code></pre></pre>
<p>嘿嘿，看看这个......好吧，现在我开始疑神疑鬼了。让我们正确填写 check_links，并在 miri 下进行测试：</p>
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>fn check_links&lt;T: Eq + std::fmt::Debug&gt;(list: &amp;LinkedList&lt;T&gt;) {
let from_front: Vec&lt;_&gt; = list.iter().collect();
let from_back: Vec&lt;_&gt; = list.iter().rev().collect();
let re_reved: Vec&lt;_&gt; = from_back.into_iter().rev().collect();
assert_eq!(from_front, re_reved);
}
<span class="boring">}</span></code></pre></pre>
<pre><code class="language-text">$env:MIRIFLAGS=&quot;-Zmiri-tag-raw-pointers&quot;
cargo miri test
Compiling linked-list v0.0.3
Finished test [unoptimized + debuginfo] target(s) in 0.25s
Running unittests src\lib.rs
running 14 tests
test test::test_basic ... ok
test test::test_basic_front ... ok
test test::test_cursor_move_peek ... ok
test test::test_cursor_mut_insert ... ok
test test::test_debug ... ok
test test::test_eq ... ok
test test::test_hashmap ... ok
test test::test_iterator ... ok
test test::test_iterator_double_end ... ok
test test::test_iterator_mut_double_end ... ok
test test::test_mut_iter ... ok
test test::test_ord ... ok
test test::test_ord_nan ... ok
test test::test_rev_iter ... ok
test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Doc-tests linked-list
running 1 test
test src\lib.rs - assert_properties::iter_mut_invariant (line 803) - compile fail ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.10s
</code></pre>
<p>完成。</p>
<p>我们成功了 我们做出了一个具有生产质量的 LinkedList，其功能与 std 中的 LinkedList 基本相同。我们是否在这里或那里缺少了一些小的便利方法？当然有。我会把它们添加到最终发布的版本中吗？也许会！</p>
<p>但是，我已经非常累了。</p>
<p>所以。我们赢了</p>
<p>等等 我们正在生产质量。好吧，最后一个步骤： clippy。</p>
<pre><code class="language-text">cargo clippy
cargo clippy
Checking linked-list v0.0.3 (C:\Users\ninte\dev\contain\linked-list)
warning: redundant pattern matching, consider using `is_some()`
--&gt; src\lib.rs:189:19
|
189 | while let Some(_) = self.pop_front() { }
| ----------^^^^^^^------------------- help: try this: `while self.pop_front().is_some()`
|
= note: `#[warn(clippy::redundant_pattern_matching)]` on by default
= note: this will change drop order of the result, as well as all temporaries
= note: add `#[allow(clippy::redundant_pattern_matching)]` if this is important
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
warning: method `into_iter` can be confused for the standard trait method `std::iter::IntoIterator::into_iter`
--&gt; src\lib.rs:210:5
|
210 | / pub fn into_iter(self) -&gt; IntoIter&lt;T&gt; {
211 | | IntoIter {
212 | | list: self
213 | | }
214 | | }
| |_____^
|
= note: `#[warn(clippy::should_implement_trait)]` on by default
= help: consider implementing the trait `std::iter::IntoIterator` or choosing a less ambiguous method name
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#should_implement_trait
warning: redundant pattern matching, consider using `is_some()`
--&gt; src\lib.rs:228:19
|
228 | while let Some(_) = self.pop_front() { }
| ----------^^^^^^^------------------- help: try this: `while self.pop_front().is_some()`
|
= note: this will change drop order of the result, as well as all temporaries
= note: add `#[allow(clippy::redundant_pattern_matching)]` if this is important
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
warning: re-implementing `PartialEq::ne` is unnecessary
--&gt; src\lib.rs:275:5
|
275 | / fn ne(&amp;self, other: &amp;Self) -&gt; bool {
276 | | self.len() != other.len() || self.iter().ne(other)
277 | | }
| |_____^
|
= note: `#[warn(clippy::partialeq_ne_impl)]` on by default
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#partialeq_ne_impl
warning: `linked-list` (lib) generated 4 warnings
Finished dev [unoptimized + debuginfo] target(s) in 0.29s
</code></pre>
<p>好的 clippy, 按照你的要求修改。</p>
<p>再来一次：</p>
<pre><code class="language-text">cargo clippy
Finished dev [unoptimized + debuginfo] target(s) in 0.00s
</code></pre>
<p>太棒了，称为生产品质的最后一件事: fmt.</p>
<pre><code class="language-text">cargo fmt
</code></pre>
<p><strong>我们现在终于真正的完成啦!!!!!!!!!!!!!!!!!!!!!</strong></p>
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