Disabling Swift Error breakpoints for XCTAssertThrowsError calls

instructions.txt

A couple options:

1. Disable the Swift Error breakpoint only within XCTAssertThrowsError() calls.

Add the Swift Error breakpoint as usual.
Edit the breakpoint, add a Debugger Command action, then paste in the following:

script lldb.process.Continue().Clear() if any(threadFrame.name.startswith('XCTest.XCTAssertThrows') for threadFrame in lldb.thread.frames) else None

This is ugly and the condition adds substantial overhead for each XCTAssertThrowsError call, but this method is easy to set up and the
Swift Error breakpoint will work everywhere else as usual.

2. Disable all Swift Error breakpoints when running tests

This one requires adding a custom command.

Stash xctestbreakpoints.py somewhere.
Edit ~/.lldbinit and add the following:

command script import /path/to/xctestbreakpoints.py

In Xcode, add a symbolic breakpoint on _XCTestMain.
Edit the breakpoint, check the automatically continue option, add a Debugger Command action, then paste in the following:

disable-swift-error-breakpoints

This will disable all Swift Error breakpoints when test execution starts.

xctestbreakpoints.py

import lldb

def disable_swift_error_breakpoints(debugger, command, result, dict):
	for breakpoint in debugger.GetSelectedTarget().breakpoint_iter():
		if not breakpoint.enabled:
			continue

		for location in breakpoint:
			if not location.IsResolved():
				continue

			if location.GetAddress().symbol.name == 'swift_willThrow':
				breakpoint.enabled = False
				break

	return None

def __lldb_init_module(debugger, dict):
	debugger.HandleCommand('command script add -f xctestbreakpoints.disable_swift_error_breakpoints disable-swift-error-breakpoints')