Class LogAssert

A test fails if Unity logs a message other than a regular log or warning message. Use LogAssert to check for an expected message in the log so that the test does not fail when Unity logs the message. Use LogAssert.Expect before running the code under test, as the check for expected logs runs at the end of each frame. A test also reports a failure, if an expected message does not appear, or if Unity does not log any regular log or warning messages.

LogAssert lets you expect Unity log messages that would otherwise cause the test to fail.

Inheritance

Object

LogAssert

Namespace: UnityEngine.TestTools

Syntax

public static class LogAssert

Properties

ignoreFailingMessages

Set this property to true to prevent unexpected error log messages from triggering an assertion. By default, it is false.

Declaration

public static bool ignoreFailingMessages { get; set; }

Property Value

Type	Description
Boolean	The value of the ignoreFailingMessages boolean property.

Methods

Expect(LogType, Regex)

Verifies that a log message of a specified type appears in the log. A test won't fail from an expected error, assertion, or exception log message. It does fail if an expected message does not appear in the log.

Declaration

public static void Expect(LogType type, Regex message)

Parameters

Type	Name	Description
LogType	type	A type of log to expect. It can take one of the LogType enum values.
Regex	message	A regular expression pattern to match the expected message.

Expect(LogType, String)

Verifies that a log message of a specified type appears in the log. A test won't fail from an expected error, assertion, or exception log message. It does fail if an expected message does not appear in the log. If multiple LogAssert.Expect are used to expect multiple messages, they are expected to be logged in that order.

Declaration

public static void Expect(LogType type, string message)

Parameters

Type	Name	Description
LogType	type	A type of log to expect. It can take one of the LogType enum values.
String	message	A string value that should equate to the expected message.

Examples

[Test]
public void LogAssertExample()
{
    // Expect a regular log message
    LogAssert.Expect(LogType.Log, "Log message");

    // The test fails without the following expected log message     
    Debug.Log("Log message");

    // An error log
    Debug.LogError("Error message");

    // Without expecting an error log, the test would fail
    LogAssert.Expect(LogType.Error, "Error message");
}

NoUnexpectedReceived()

Triggers an assertion when receiving any log messages and fails the test if some are unexpected messages. If multiple tests need to check for no received unexpected logs, consider using the TestMustExpectAllLogsAttribute attribute instead.

Declaration

public static void NoUnexpectedReceived()