Docs sync

googletest/docs/primer.md

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 # Googletest Primer
 
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 ## Introduction: Why googletest?
 
 *googletest* helps you write better C++ tests.
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 **Availability**: Linux, Windows, Mac.
 
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 ## Invoking the Tests
 
 `TEST()` and `TEST_F()` implicitly register their tests with googletest. So,
@@ -544,6 +546,7 @@ int main(int argc, char **argv) {
 }
 ```
 
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 The `::testing::InitGoogleTest()` function parses the command line for
 googletest flags, and removes all recognized flags. This allows the user to
 control a test program's behavior via various flags, which we'll cover in
@@ -560,6 +563,7 @@ gtest\_main library and you are good to go.
 
 NOTE: `ParseGUnitFlags()` is deprecated in favor of `InitGoogleTest()`.
 
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 ## Known Limitations
 
 *   Google Test is designed to be thread-safe. The implementation is thread-safe