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testing: clarify in docs that TestMain is advanced
Beginner and intermediate Go users periodically use TestMain when requirements do not necessitate TestMain (exceeding least-mechanism design). This commit expands package testing's documentation to convey that the TestMain feature itself is somewhat low-level and potentially unsuitable for casual testing where ordinary test functions would suffice. Fixes #42161 Updates #44200 Change-Id: I91ba0b048c3d6f79110fe8f0fbb58d896edca366 Reviewed-on: https://go-review.googlesource.com/c/go/+/334649 Trust: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Rob Pike <r@golang.org>
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@ -233,6 +233,8 @@
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// os.Exit(m.Run())
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// }
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//
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// TestMain is a low-level primitive and should not be necessary for casual
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// testing needs, where ordinary test functions suffice.
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package testing
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import (
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