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Upgrade andrew, add new article and update the styles.
Also use a real valid list instead of that crazy list element.
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@@ -3,7 +3,7 @@ FROM golang:1.22 AS base | |
| WORKDIR /usr/src/app | ||
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| ENV CGO_ENABLED=0 | ||
| RUN go install github.com/playtechnique/andrew/cmd/[email protected].6 | ||
| RUN go install github.com/playtechnique/andrew/cmd/[email protected].7 | ||
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| FROM scratch | ||
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| <!DOCTYPE html> | ||
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| <head> | ||
| <script type="text/javascript" src="/main.js"></script> | ||
| <title>testing panics in go</title> | ||
| <meta name="andrew-published-at" content="2024-04-20" </head> | ||
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| <body> | ||
| <nav class="navigation"> | ||
| <a href="/" class="link">front page</a> | ||
| <a href="/articles/index.html" class="link">articles</a> | ||
| <a href="/projects/index.html" class="link">projects</a> | ||
| </nav> | ||
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| <link rel="stylesheet" href="/styles.css"> | ||
| <div id="header"></div> | ||
| <main> | ||
| <article> | ||
| <section id="introduction"> | ||
| <h1>You want to call a panic in a piece of code and have the test not fail?</h1> | ||
| <p>In a deferred function, call <code>recover()</code>. If it has a return value that is not nil, it <i>succeeded and caught the panic</i> | ||
| i.e. <code> if err == nil </code> then you can call <code>t.Fatal()</code> in your test.</p> | ||
| </section> | ||
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| <section id="setup"> | ||
| <h1>Here's the setup code</h1> | ||
| <p>Let's start a new package to demonstrate this:</p> | ||
| <pre><code>mkdir panicker && cd panicker && go mod init panicker && touch panicker_test.go | ||
| </code> | ||
| </pre> | ||
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| <p>Here's the content of panicker_test.go:</p> | ||
| <pre><code>package panicker | ||
| import "testing" | ||
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| func Panics() { | ||
| panic("I panic!") | ||
| } | ||
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| func TestPanics(t *testing.T) { | ||
| Panics() | ||
| } | ||
| </code> | ||
| </pre> | ||
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| <p>Here's how she runs:</p> | ||
| <pre><code>; go test -v panicker | ||
| === RUN TestPanics | ||
| --- FAIL: TestPanics (0.00s) | ||
| panic: I panic! [recovered] | ||
| panic: I panic! | ||
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| goroutine 34 [running]: | ||
| testing.tRunner.func1.2({0x10441d540, 0x1044455e0}) | ||
| /opt/homebrew/Cellar/go/1.22.2/libexec/src/testing/testing.go:1631 +0x1c4 | ||
| testing.tRunner.func1() | ||
| /opt/homebrew/Cellar/go/1.22.2/libexec/src/testing/testing.go:1634 +0x33c | ||
| panic({0x10441d540?, 0x1044455e0?}) | ||
| /opt/homebrew/Cellar/go/1.22.2/libexec/src/runtime/panic.go:770 +0x124 | ||
| panicker.Panics(...) | ||
| /Users/gwyn/Source/panicker/panicker_test.go:6 | ||
| panicker.TestPanics(0x14000124680?) | ||
| /Users/gwyn/Source/panicker/panicker_test.go:17 +0x30 | ||
| testing.tRunner(0x14000124680, 0x104444dc0) | ||
| /opt/homebrew/Cellar/go/1.22.2/libexec/src/testing/testing.go:1689 +0xec | ||
| created by testing.(*T).Run in goroutine 1 | ||
| /opt/homebrew/Cellar/go/1.22.2/libexec/src/testing/testing.go:1742 +0x318 | ||
| FAIL panicker 0.082s | ||
| FAIL | ||
| </code> | ||
| </pre> | ||
| </section> | ||
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| <section id="code"> | ||
| <h1>Here's the implementation</h1> | ||
| <p>Update TestPanics to contain a deferred call to recover().</p> | ||
| <pre><code>package panicker | ||
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| import "testing" | ||
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| func Panics() { | ||
| panic("I panic!") | ||
| } | ||
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| func TestPanics(t *testing.T) { | ||
| defer func() { | ||
| err := recover() | ||
| if err == nil { | ||
| t.Fatalf("Expected panic with invalid address, received %v", err) | ||
| } | ||
| }() | ||
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| Panics() | ||
| } | ||
| </code> | ||
| </pre> | ||
| <p>How does she run now?</p> | ||
| <pre><code>; go test -v panicker | ||
| === RUN TestPanics | ||
| --- PASS: TestPanics (0.00s) | ||
| PASS | ||
| ok panicker 0.123s | ||
| </code> | ||
| </pre> | ||
| <p>Notice the error check condition: recover() is non-nil if it's actually called; if recover()'s return value is nil, it was never triggered, | ||
| so we didn't actually trigger our expected error. | ||
| </p> | ||
| </section> | ||
| </article> | ||
| </main> | ||
| </body> |
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