diff --git a/testing/btest/Baseline/opt.coalescence/output b/testing/btest/Baseline/opt.coalescence/output
new file mode 100644
index 0000000000..90b992b6cc
--- /dev/null
+++ b/testing/btest/Baseline/opt.coalescence/output
@@ -0,0 +1,5 @@
+### 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
diff --git a/testing/btest/Baseline/opt.no-coalescence/output b/testing/btest/Baseline/opt.no-coalescence/output
new file mode 100644
index 0000000000..9fa75ea74d
--- /dev/null
+++ b/testing/btest/Baseline/opt.no-coalescence/output
@@ -0,0 +1,5 @@
+### 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
diff --git a/testing/btest/opt/coalescence.zeek b/testing/btest/opt/coalescence.zeek
new file mode 100644
index 0000000000..9552c168ba
--- /dev/null
+++ b/testing/btest/opt/coalescence.zeek
@@ -0,0 +1,23 @@
+# @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();
+	}
diff --git a/testing/btest/opt/no-coalescence.zeek b/testing/btest/opt/no-coalescence.zeek
new file mode 100644
index 0000000000..2bd87bd413
--- /dev/null
+++ b/testing/btest/opt/no-coalescence.zeek
@@ -0,0 +1,23 @@
+# @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();
+	}