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strings: add a test case of growLen is negative

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Before committing,  the test coverage of strings/builder.go is 97.4%
After committing,  the test coverage of strings/builder.go is 100%

Change-Id: I22643b1c4632b5ca7ef98362f32bb85faae80bad
GitHub-Last-Rev: 2a55ca3e33
GitHub-Pull-Request: golang/go#55004
Reviewed-on: https://go-review.googlesource.com/c/go/+/430156
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Jenny Rakoczy <jenny@golang.org>
This commit is contained in:
cui fliter 2022-09-12 15:50:04 +00:00 committed by Gopher Robot
parent 77420fa119
commit 09f3ff174c
1 changed files with 9 additions and 0 deletions
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9
src/strings/builder_test.go
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@ -109,6 +109,15 @@ func TestBuilderGrow(t *testing.T) {
t.Errorf("growLen=%d: got %d allocs during Write; want %v", growLen, g, w)
}
}
// when growLen < 0, should panic
var a Builder
n := -1
defer func() {
if r := recover(); r == nil {
t.Errorf("a.Grow(%d) should panic()", n)
}
}()
a.Grow(n)
}
func TestBuilderWrite2(t *testing.T) {