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65 lines
2.5 KiB
Markdown
65 lines
2.5 KiB
Markdown
# Assertion Macros
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Most test frameworks have a large collection of assertion macros to capture all possible conditional forms (```_EQUALS```, ```_NOTEQUALS```, ```_GREATER_THAN``` etc).
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Catch is different. Because it decomposes natural C-style conditional expressions most of these forms are reduced to one or two that you will use all the time. That said there are a rich set of auxilliary macros as well. We'll describe all of these here.
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Most of these macros come in two forms:
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## Natural Expressions
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The ```REQUIRE``` family of macros tests an expression and aborts the test case if it fails.
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The ```CHECK``` family are equivalent but execution continues in the same test case even if the assertion fails. This is useful if you have a series of essentially orthogonal assertions and it is useful to see all the results rather than stopping at the first failure.
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* **REQUIRE(** _expression_ **)** and
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* **CHECK(** _expression_ **)**
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Evaluates the expression and records the result. If an exception is thrown it is caught, reported, and counted as a failure. These are the macros you will use most of the time
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Examples:
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```c++
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CHECK( str == "string value" );
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CHECK( thisReturnsTrue() );
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REQUIRE( i == 42 );
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```
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* **REQUIRE_FALSE(** _expression_ **)** and
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* **CHECK_FALSE(** _expression_ **)**
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Evaluates the expression and records the _logical NOT_ of the result. If an exception is thrown it is caught, reported, and counted as a failure.
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(these forms exist as a workaround for the fact that ! prefixed expressions cannot be decomposed).
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Example:
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```c++
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REQUIRE_FALSE( thisReturnsFalse() );
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```
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## Exceptions
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* **REQUIRE_THROWS(** _expression_ **)** and
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* **CHECK_THROWS(** _expression_ **)**
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Expects that an exception (of any type) is be thrown during evaluation of the expression.
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* **REQUIRE_THROWS_AS(** _expression_, _exception type_ **)** and
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* **CHECK_THROWS_AS(** _expression_, _exception type_ **)**
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Expects that an exception of the _specified type_ is thrown during evaluation of the expression.
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* **REQUIRE_NOTHROW(** _expression_ **)** and
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* **CHECK_NOTHROW(** _expression_ **)**
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Expects that no exception is thrown during evaluation of the expression.
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## Matcher expressions
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To support Matchers a slightly different form is used. Matchers will be more fully documented elsewhere. *Note that Matchers are still at early stage development and are subject to change.*
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* **REQUIRE_THAT(** _lhs_, _matcher call_ **)** and
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* **CHECK_THAT(** _lhs_, _matcher call_ **)**
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---
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[Home](../README.md)
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