Fix failure logs and add explicit tests.

Author: ioquatix

gems.rb

@@ -23,6 +23,7 @@
 	gem "decode"
 
 	gem "sus-fixtures-async"
+	gem "sus-fixtures-console", "~> 0.3"
 
 	gem "bake-test"
 	gem "bake-test-external"

lib/async/task.rb

@@ -191,7 +191,7 @@ def run(*arguments)
 				rescue => error
 					# I'm not completely happy with this overhead, but the alternative is to not log anything which makes debugging extremely difficult. Maybe we can introduce a debug wrapper which adds extra logging.
 					if @finished.nil?
-						Console::Event::Failure.for(error).emit("Task may have ended with unhandled exception.", severity: :warn)
+						Console::Event::Failure.for(error).emit(self, "Task may have ended with unhandled exception.", severity: :warn)
 					# else
 					# 	Console::Event::Failure.for(error).emit(self, severity: :debug)
 					end

test/async/task.rb

@@ -9,6 +9,8 @@
 require 'async/clock'
 require 'async/queue'
 
+require 'sus/fixtures/console'
+
 require 'timer_quantum'
 
 describe Async::Task do
@@ -909,4 +911,48 @@ def sleep_forever
 			expect(child_task).to be(:stopped?)
 		end
 	end
+	
+	with "failing task" do
+		include_context Sus::Fixtures::Console::CapturedLogger
+		
+		it "logs a warning if a task fails without being waited on" do
+			failed_task = nil
+			
+			reactor.async do |task|
+				task.async do |task|
+					failed_task = task
+					raise "boom"
+				end
+			end
+			
+			reactor.run
+			
+			expect_console.to have_logged(
+				severity: be == :warn,
+				subject: be_equal(failed_task),
+				message: be == "Task may have ended with unhandled exception."
+			)
+		end
+		
+		it "does not log a warning if a task fails and is waited on" do
+			failed_task = nil
+			
+			reactor.async do |task|
+				expect do
+					task.async do |task|
+						# This ensures #wait is called by the parent before proceeding to raise the exception:
+						task.yield
+						failed_task = task
+						raise "boom"
+					end.wait
+				end.to raise_exception(RuntimeError, message: be =~ /boom/)
+			end
+			
+			reactor.run
+			
+			expect_console.not.to have_logged(
+				severity: be == :warn,
+			)
+		end
+	end
 end