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130 lines
3.5 KiB
Markdown
130 lines
3.5 KiB
Markdown
<a id="top"></a>
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# Explicitly skipping, passing, and failing tests at runtime
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## Skipping Test Cases at Runtime
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> [Introduced](https://github.com/catchorg/Catch2/pull/2360) in Catch2 X.Y.Z.
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In some situations it may not be possible to meaningfully execute a test case,
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for example when the system under test is missing certain hardware capabilities.
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If the required conditions can only be determined at runtime, it often
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doesn't make sense to consider such a test case as either passed or failed,
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because it simply can not run at all.
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To properly express such scenarios, Catch2 provides a way to explicitly
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_skip_ test cases, using the `SKIP` macro:
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```
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SKIP( [streamable expression] )
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```
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Example usage:
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```c++
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TEST_CASE("copy files between drives") {
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if(getNumberOfHardDrives() < 2) {
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SKIP("at least two hard drives required");
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}
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// ...
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}
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```
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This test case is then reported as _skipped_ instead of _passed_ or _failed_.
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The `SKIP` macro behaves similarly to an explicit [`FAIL`](#passing-and-failing-test-cases),
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in that it is the last expression that will be executed:
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```c++
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TEST_CASE("my test") {
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printf("foo");
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SKIP();
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printf("bar"); // not printed
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}
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```
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However a failed assertion _before_ a `SKIP` still causes the entire
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test case to fail:
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```c++
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TEST_CASE("failing test") {
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CHECK(1 == 2);
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SKIP();
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}
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```
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### Interaction with Sections and Generators
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Sections, nested sections as well as specific outputs from [generators](generators.md#top)
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can all be individually skipped, with the rest executing as usual:
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```c++
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TEST_CASE("complex test case") {
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int value = GENERATE(2, 4, 6);
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SECTION("a") {
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SECTION("a1") { CHECK(value < 8); }
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SECTION("a2") {
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if (value == 4) {
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SKIP();
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}
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CHECK(value % 2 == 0);
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}
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}
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}
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```
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This test case will report 5 passing assertions; one for each of the three
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values in section `a1`, and then two in section `a2`, from values 2 and 4.
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Note that as soon as one section is skipped, the entire test case will
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be reported as _skipped_ (unless there is a failing assertion, in which
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case the test is handled as _failed_ instead).
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Note that if all test cases in a run are skipped, Catch2 returns a non-zero
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exit code, same as it does if no test cases have run. This behaviour can
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be overridden using the [--allow-running-no-tests](command-line.md#no-tests-override)
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flag.
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## Passing and failing test cases
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Test cases can also be explicitly passed or failed, without the use of
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assertions, and with a specific message. This can be useful to handle
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complex preconditions/postconditions and give useful error messages
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when they fail.
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* `SUCCEED( [streamable expression] )`
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`SUCCEED` is morally equivalent with `INFO( [streamable expression] ); REQUIRE( true );`.
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Note that it does not stop further test execution, so it cannot be used
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to guard failing assertions from being executed.
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_In practice, `SUCCEED` is usually used as a test placeholder, to avoid
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[failing a test case due to missing assertions](command-line.md#warnings)._
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```cpp
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TEST_CASE( "SUCCEED showcase" ) {
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int I = 1;
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SUCCEED( "I is " << I );
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// ... execution continues here ...
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}
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```
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* `FAIL( [streamable expression] )`
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`FAIL` is morally equivalent with `INFO( [streamable expression] ); REQUIRE( false );`.
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_In practice, `FAIL` is usually used to stop executing test that is currently
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known to be broken, but has to be fixed later._
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```cpp
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TEST_CASE( "FAIL showcase" ) {
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FAIL( "This test case causes segfault, which breaks CI." );
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// ... this will not be executed ...
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}
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```
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---
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[Home](Readme.md#top)
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