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Clarify the pitfalls of EXPECT_THAT and highlight it's best practices

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PiperOrigin-RevId: 450721917
Change-Id: I34d63a65b7158975abd46a9a14cded75439e7e7f
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Abseil Team 2022-05-24 10:57:10 -07:00 committed by Copybara-Service
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commit 7041051488
1 changed files with 7 additions and 3 deletions
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10
docs/reference/matchers.md
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@ -8,9 +8,13 @@ A **matcher** matches a *single* argument. You can use it inside `ON_CALL()` or
| `EXPECT_THAT(actual_value, matcher)` | Asserts that `actual_value` matches `matcher`. |
| `ASSERT_THAT(actual_value, matcher)` | The same as `EXPECT_THAT(actual_value, matcher)`, except that it generates a **fatal** failure. |
{: .callout .note}
**Note:** Although equality matching via `EXPECT_THAT(actual_value,
expected_value)` is supported, prefer to make the comparison explicit via
{: .callout .warning}
**WARNING:** Equality matching via `EXPECT_THAT(actual_value, expected_value)`
is supported, however note that implicit conversions can cause surprising
results. For example, `EXPECT_THAT(some_bool, "some string")` will compile and
may pass unintentionally.
**BEST PRACTICE:** Prefer to make the comparison explicit via
`EXPECT_THAT(actual_value, Eq(expected_value))` or `EXPECT_EQ(actual_value,
expected_value)`.