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Commit 437e1008 authored by Gennadiy Civil's avatar Gennadiy Civil
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Documentation sync in preparation to including docs with full source sync

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googletest/docs/advanced.md
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# Advanced googletest Topics
<!-- GOOGLETEST_CM0015 DO NOT DELETE -->
## Introduction
Now that you have read the [googletest Primer](primer.md) and learned how to write
tests using googletest, it's time to learn some new tricks. This document will
show you more assertions as well as how to construct complex failure messages,
propagate fatal failures, reuse and speed up your test fixtures, and use various
flags with your tests.
Now that you have read the [googletest Primer](primer.md) and learned how to
write tests using googletest, it's time to learn some new tricks. This document
will show you more assertions as well as how to construct complex failure
messages, propagate fatal failures, reuse and speed up your test fixtures, and
use various flags with your tests.
## More Assertions
......@@ -103,11 +104,13 @@ If you already have a function or functor that returns `bool` (or a type that
can be implicitly converted to `bool`), you can use it in a *predicate
assertion* to get the function arguments printed for free:
| Fatal assertion | Nonfatal assertion | Verifies |
| ---------------------------------- | ---------------------------------- | --------------------------- |
| `ASSERT_PRED1(pred1, val1);` | `EXPECT_PRED1(pred1, val1);` | `pred1(val1)` is true |
| `ASSERT_PRED2(pred2, val1, val2);` | `EXPECT_PRED2(pred2, val1, val2);` | `pred2(val1, val2)` is true |
| `...` | `...` | ... |
| Fatal assertion | Nonfatal assertion | Verifies |
| -------------------- | -------------------- | --------------------------- |
| `ASSERT_PRED1(pred1, | `EXPECT_PRED1(pred1, | `pred1(val1)` is true |
: val1);` : val1);` : :
| `ASSERT_PRED2(pred2, | `EXPECT_PRED2(pred2, | `pred2(val1, val2)` is true |
: val1, val2);` : val1, val2);` : :
| `...` | `...` | ... |
In the above, `predn` is an `n`-ary predicate function or functor, where `val1`,
`val2`, ..., and `valn` are its arguments. The assertion succeeds if the
......@@ -337,22 +340,23 @@ want to learn more, see
#### Floating-Point Macros
| Fatal assertion | Nonfatal assertion | Verifies |
| ------------------------------- | ------------------------------ | ---------------------------------------- |
| `ASSERT_FLOAT_EQ(val1, val2);` | `EXPECT_FLOAT_EQ(val1,val2);` | the two `float` values are almost equal |
| `ASSERT_DOUBLE_EQ(val1, val2);` | `EXPECT_DOUBLE_EQ(val1, val2);`| the two `double` values are almost equal |
| Fatal assertion | Nonfatal assertion | Verifies |
| ----------------------- | ----------------------- | ----------------------- |
| `ASSERT_FLOAT_EQ(val1, | `EXPECT_FLOAT_EQ(val1, | the two `float` values |
: val2);` : val2);` : are almost equal :
| `ASSERT_DOUBLE_EQ(val1, | `EXPECT_DOUBLE_EQ(val1, | the two `double` values |
: val2);` : val2);` : are almost equal :
By "almost equal" we mean the values are within 4 ULP's from each other.
NOTE: `CHECK_DOUBLE_EQ()` in `base/logging.h` uses a fixed absolute error bound,
so its result may differ from that of the googletest macros. That macro is
unsafe and has been deprecated. Please don't use it any more.
The following assertions allow you to choose the acceptable error bound:
| Fatal assertion | Nonfatal assertion | Verifies |
| ------------------------------------- | ------------------------------------- | ------------------------- |
| `ASSERT_NEAR(val1, val2, abs_error);` | `EXPECT_NEAR(val1, val2, abs_error);` | the difference between `val1` and `val2` doesn't exceed the given absolute error |
| Fatal assertion | Nonfatal assertion | Verifies |
| ------------------ | ------------------------ | ------------------------- |
| `ASSERT_NEAR(val1, | `EXPECT_NEAR(val1, val2, | the difference between |
: val2, abs_error);` : abs_error);` : `val1` and `val2` doesn't :
: : : exceed the given absolute :
: : : error :
**Availability**: Linux, Windows, Mac.
......
googletest/docs/primer.md
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......@@ -193,8 +193,7 @@ objects, you should use `ASSERT_EQ`.
When doing pointer comparisons use `*_EQ(ptr, nullptr)` and `*_NE(ptr, nullptr)`
instead of `*_EQ(ptr, NULL)` and `*_NE(ptr, NULL)`. This is because `nullptr` is
typed while `NULL` is not. See [FAQ](faq.md#why-does-googletest-support-expect_eqnull-ptr-and-assert_eqnull-ptr-but-not-expect_nenull-ptr-and-assert_nenull-ptr)
for more details.
typed while `NULL` is not. See [FAQ](faq.md)for more details.
If you're working with floating point numbers, you may want to use the floating
point variations of some of these macros in order to avoid problems caused by
......@@ -295,8 +294,8 @@ should be in the same test suite; in other words, the first argument to their
suite `FactorialTest`.
When naming your test suites and tests, you should follow the same convention as
for [naming functions and
classes](https://google.github.io/styleguide/cppguide.html#Function_Names).
for
[naming functions and classes](https://google.github.io/styleguide/cppguide.html#Function_Names).
**Availability**: Linux, Windows, Mac.
......@@ -318,7 +317,7 @@ To create a fixture:
1. If necessary, write a destructor or `TearDown()` function to release any
resources you allocated in `SetUp()` . To learn when you should use the
constructor/destructor and when you should use `SetUp()/TearDown()`, read
this [FAQ](faq.md#should-i-use-the-constructordestructor-of-the-test-fixture-or-setupteardown) entry.
the [FAQ](faq.md).
1. If needed, define subroutines for your tests to share.
When using a fixture, use `TEST_F()` instead of `TEST()` as it allows you to
......@@ -432,7 +431,6 @@ When these tests run, the following happens:
**Availability**: Linux, Windows, Mac.
## Invoking the Tests
`TEST()` and `TEST_F()` implicitly register their tests with googletest. So,
......@@ -446,7 +444,7 @@ different test suites, or even different source files.
When invoked, the `RUN_ALL_TESTS()` macro:
1. Saves the state of all googletest flags
* Saves the state of all googletest flags
* Creates a test fixture object for the first test.
......@@ -458,7 +456,7 @@ When invoked, the `RUN_ALL_TESTS()` macro:
* Deletes the fixture.
* Restores the state of all googletest flags
* Restores the state of all all googletest flags
* Repeats the above steps for the next test, until all tests have run.
......@@ -471,15 +469,17 @@ If a fatal failure happens the subsequent steps will be skipped.
> return the value of `RUN_ALL_TESTS()`.
>
> Also, you should call `RUN_ALL_TESTS()` only **once**. Calling it more than
> once conflicts with some advanced googletest features (e.g. thread-safe [death
> tests](advanced.md#death-tests)) and thus is not supported.
> once conflicts with some advanced googletest features (e.g. thread-safe
> [death tests](advanced.md#death-tests)) and thus is not supported.
**Availability**: Linux, Windows, Mac.
## Writing the main() Function
Write your own main() function, which should
return the value of `RUN_ALL_TESTS()`
Write your own main() function, which should return the value of
`RUN_ALL_TESTS()`
You can start from this boilerplate:
```c++
#include "this/package/foo.h"
......@@ -538,7 +538,6 @@ int main(int argc, char **argv) {
}
```
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
......@@ -555,7 +554,6 @@ gtest\_main library and you are good to go.
NOTE: `ParseGUnitFlags()` is deprecated in favor of `InitGoogleTest()`.
## Known Limitations
* Google Test is designed to be thread-safe. The implementation is thread-safe
......
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