BTests for testing that event handler coalescence operates as expected

testing/btest/Baseline/opt.coalescence/output

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+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+my_event
+ZAM-code my_event 
+second instance, higher priority
+first instance, lower priority

testing/btest/Baseline/opt.no-coalescence/output

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+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+my_event
+ZAM-code my_event ZAM-code my_event 
+second instance, higher priority
+first instance, lower priority

testing/btest/opt/coalescence.zeek

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+# @TEST-DOC: Ensure that event coalescence works properly.
+#
+# @TEST-EXEC: zeek -b -O ZAM %INPUT >output
+# @TEST-EXEC: btest-diff output
+
+event my_event() &priority=-10
+	{
+	print "first instance, lower priority";
+	}
+
+event my_event() &priority=10
+	{
+	print "second instance, higher priority";
+	}
+
+event zeek_init()
+	{
+	# This should print a single event handler body.
+	print my_event;
+
+	# Make sure execution of both handlers happens properly.
+	event my_event();
+	}

testing/btest/opt/no-coalescence.zeek

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+# @TEST-DOC: Ensure that event coalescence doesn't happen if inlining turned off.
+#
+# @TEST-EXEC: zeek -b -O ZAM -O no-inline %INPUT >output
+# @TEST-EXEC: btest-diff output
+
+event my_event() &priority=-10
+	{
+	print "first instance, lower priority";
+	}
+
+event my_event() &priority=10
+	{
+	print "second instance, higher priority";
+	}
+
+event zeek_init()
+	{
+	# This should print two event handler bodies.
+	print my_event;
+
+	# Make sure execution of both handlers happens properly.
+	event my_event();
+	}