TextReport is not visible (if no slf4j implementation is found in classpath)

[asolntsev]

The problem

Selenide depends only on slf4j-api.jar and doesn't provide any of slf4j implementations.
Users who are not aware of slf4j specifics just don't see any Selenide logs and don't even know about the problem.

Details

Actually users do see these errors in logs:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

But users don't realise it's somehow connected to Selenide's TextReport.

Solution

I suggest that Selenide should fail if there is not slf4j implementations found in classpath. Giving a clear error message like

java.lang.IllegalStateException: SLF4J is not configured. You will not see any Selenide logs. Please add slf4j-simple.jar, slf4j-log4j12.jar or logback-classic.jar to your classpath.

	at com.codeborne.selenide.Selenide.open(Selenide.java:66)
	at integration.BasicAuthTest.canPassBasicAuth_via_proxy(BasicAuthTest.java:22)

Tell us about your environment

• Selenide Version: 5.10.0

[asolntsev]

Done in #1115