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# Advanced googletest Topics
go/gunitadvanced
[TOC]
## Introduction
Now that you have read the [googletest Primer](primer.md) and learned how to

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# Googletest FAQ
go/gunitfaq
[TOC]
## Why should test suite names and test names not contain underscore?
Note: Googletest reserves underscore (`_`) for special purpose keywords, such as
@ -350,8 +346,8 @@ You may still want to use `SetUp()/TearDown()` in the following cases:
* In the body of a constructor (or destructor), it's not possible to use the
`ASSERT_xx` macros. Therefore, if the set-up operation could cause a fatal
test failure that should prevent the test from running, it's necessary to
use `abort` (in google3, use `CHECK`) and abort the whole test executable,
or to use `SetUp()` instead of a constructor.
use `abort` and abort the whole test
executable, or to use `SetUp()` instead of a constructor.
* If the tear-down operation could throw an exception, you must use
`TearDown()` as opposed to the destructor, as throwing in a destructor leads
to undefined behavior and usually will kill your program right away. Note

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# gMock Cheat Sheet
go/gmockcheat
[TOC]
<!--#include file="includes/g3_BUILD_rule.md"-->
## Defining a Mock Class
### Mocking a Normal Class {#MockClass}
@ -229,8 +223,6 @@ and the default action will be taken each time.
## Matchers {#MatcherList}
go/matchers
A **matcher** matches a *single* argument. You can use it inside `ON_CALL()` or
`EXPECT_CALL()`, or use it to validate a value directly using two macros:
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| `WhenDynamicCastTo<T>(m)` | when `argument` is passed through `dynamic_cast<T>()`, it matches matcher `m`. |
<!-- mdformat on -->
<!--#include file="includes/g3_proto_matchers.md"-->
<!--#include file="includes/g3_absl_status_matcher.md"-->
### Multi-argument Matchers {#MultiArgMatchers}
Technically, all matchers match a *single* value. A "multi-argument" matcher is
@ -470,8 +458,6 @@ You can make a matcher from one or more other matchers:
| `Not(m)` | `argument` doesn't match matcher `m`. |
<!-- mdformat on -->
<!--#include file="includes/g3_useful_matchers_outsidegmock.md"-->
### Adapters for Matchers
<!-- mdformat off(no multiline tables) -->
@ -615,8 +601,6 @@ value, and `foo` by reference.
**Note:** due to technical reasons, `DoDefault()` cannot be used inside a
composite action - trying to do so will result in a run-time error.
<!--#include file="includes/g3_stubby_actions.md"-->
### Composite Actions
<!-- mdformat off(no multiline tables) -->

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# gMock Cookbook
go/gmockcook
You can find recipes for using gMock here. If you haven't yet, please read
[the dummy guide](gmock_for_dummies.md) first to make sure you understand the
basics.
@ -11,8 +9,6 @@ recommended to write `using ::testing::Foo;` once in your file before using the
name `Foo` defined by gMock. We omit such `using` statements in this section for
brevity, but you should do it in your own code.
[TOC]
## Creating Mock Classes
Mock classes are defined as normal classes, using the `MOCK_METHOD` macro to
@ -183,8 +179,7 @@ class MockStack : public StackInterface<Elem> {
### Mocking Non-virtual Methods {#MockingNonVirtualMethods}
gMock can mock non-virtual functions to be used in Hi-perf dependency
injection.[See this](http://go/tott/33)
gMock can mock non-virtual functions to be used in Hi-perf dependency injection.
In this case, instead of sharing a common base class with the real class, your
mock class will be *unrelated* to the real class, but contain methods with the
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```cpp
EXPECT_CALL(foo, DoThat(_, NotNull()));
```
<!--#include file="includes/g3_matching_proto_buffers_cookbook_recipe.md"-->
### Combining Matchers {#CombiningMatchers}
@ -1161,8 +1155,6 @@ Note that the predicate function / functor doesn't have to return `bool`. It
works as long as the return value can be used as the condition in in statement
`if (condition) ...`.
<!--#include file="includes/g3_callbacks_as_matchers.md"-->
### Matching Arguments that Are Not Copyable
When you do an `EXPECT_CALL(mock_obj, Foo(bar))`, gMock saves away a copy of
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### Knowing When to Expect {#UseOnCall}
(go/use-on-call)
**`ON_CALL`** is likely the *single most under-utilized construct* in gMock.
There are basically two constructs for defining the behavior of a mock object:
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If the built-in actions don't suit you, you can use an existing callable
(function, `std::function`, method, functor, lambda) as an action.
<!--#include file="includes/g3_callback_snippet.md"-->
```cpp
using ::testing::_; using ::testing::Invoke;
@ -3266,8 +3254,6 @@ If you are interested in the mock call trace but not the stack traces, you can
combine `--gmock_verbose=info` with `--gtest_stack_trace_depth=0` on the test
command line.
<!--#include file="includes/g3_testing_code_stubby_server.md"-->
### Running Tests in Emacs
If you build and run your tests in Emacs using the `M-x google-compile` command
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Although `std::function` supports unlimited number of arguments, `MockFunction`
implementation is limited to ten. If you ever hit that limit... well, your
callback has bigger problems than being mockable. :-)
<!--#include file="includes/g3_content.md"-->

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## Legacy gMock FAQ {#GMockFaq}
go/gmockfaq
[TOC]
### When I call a method on my mock object, the method for the real object is invoked instead. What's the problem?
In order for a method to be mocked, it must be *virtual*, unless you use the
@ -83,8 +79,6 @@ void Bar(int* p); // Neither p nor *p is const.
void Bar(const int* p); // p is not const, but *p is.
```
<!--#include file="includes/g3_mock_multithreaded.md"-->
### I can't figure out why gMock thinks my expectations are not satisfied. What should I do?
You might want to run your test with `--gmock_verbose=info`. This flag lets
@ -128,8 +122,6 @@ using ::testing::_;
.Times(0);
```
<!--#include file="includes/g3_mock_a_stubby_server.md"-->
### I have a failed test where gMock tells me TWICE that a particular expectation is not satisfied. Isn't this redundant?
When gMock detects a failure, it prints relevant information (the mock function

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# gMock for Dummies {#GMockForDummies}
go/gmockfordummies
[TOC]
## What Is gMock?
When you write a prototype or test, often it's not feasible or wise to rely on
@ -208,8 +204,6 @@ choosing the adaptor interface can make your code easier to write and more
readable (a net win in the long run), as you can choose `FooAdaptor` to fit your
specific domain much better than `Foo` does.
<!--#include file="includes/g3_wrap_external_api_snippet.md"-->
## Using Mocks in Tests
Once you have a mock class, using it is easy. The typical work flow is:

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## Using GoogleTest from various build systems
[TOC]
GoogleTest comes with pkg-config files that can be used to determine all
necessary flags for compiling and linking to GoogleTest (and GoogleMock).
Pkg-config is a standardised plain-text format containing

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# Googletest Primer
go/gunitprimer
[TOC]
## Introduction: Why googletest?
*googletest* helps you write better C++ tests.