test: add functional test for -maxtipage parameter

[theStack]

This PR adds a missing test for the -maxtipage parameter which controls what is the allowed maximum tip age for leaving IBD:

bitcoin/src/init.cpp

Line 540 in 792d0d8

argsman.AddArg("-maxtipage=<n>", strprintf("Maximum tip age in seconds to consider node in initial block download (default: %u)", DEFAULT_MAX_TIP_AGE), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);

Relevant code path in the CChainState::IsInitialBlockDownload method:

bitcoin/src/validation.cpp

Lines 1479 to 1480 in 792d0d8

	if (m_chain.Tip()->GetBlockTime() < (GetTime() - nMaxTipAge))
	return true;

The test is pretty simple and should be self-explanatory.

[laanwj]

Concept ACK, thanks for adding a test for this.

[DrahtBot]

The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

Conflicts

Reviewers, this pull request conflicts with the following ones:

• #24149 (Signing support for Miniscript Descriptors by darosior)
• #24148 (Miniscript support in Output Descriptors by darosior)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

[maflcko]

review ACK 75656ad