Added Jon's test cases as unit tests

testing/btest/Baseline/scripts.base.frameworks.logging.ascii-utf8-enabled-control-characters/test.log

@@ -0,0 +1,10 @@
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	test
+#open	2019-07-23-11-40-47
+#fields	s
+#types	string
+foo \x0a\x09\x00 bar
+#close	2019-07-23-11-40-47

testing/btest/Baseline/scripts.base.frameworks.logging.ascii-utf8-enabled-set-separator-escape/test.log

@@ -0,0 +1,10 @@
+#separator \x09
+#set_separator	\xc2\xae
+#empty_field	(empty)
+#unset_field	-
+#path	test
+#open	2019-07-23-11-46-43
+#fields	ss
+#types	set[string]
+\xc2\xae
+#close	2019-07-23-11-46-43

testing/btest/scripts/base/frameworks/logging/ascii-utf8-enabled-control-characters.zeek

@@ -0,0 +1,21 @@
+#
+# @TEST-EXEC: zeek -b %INPUT
+# @TEST-EXEC: btest-diff test.log
+
+@load tuning/enable-utf-8-logs
+
+module Test;
+export {
+	redef enum Log::ID += { LOG };
+
+	type Log: record {
+		s: string;
+	} &log;
+}
+
+event zeek_init()
+	{
+	local a = "foo \n\t\0 bar";
+	Log::create_stream(Test::LOG, [$columns=Log]);
+	Log::write(Test::LOG, [$s=a]);
+	}

testing/btest/scripts/base/frameworks/logging/ascii-utf8-enabled-set-separator-escape.zeek

@@ -0,0 +1,23 @@
+#
+# @TEST-EXEC: zeek -b %INPUT
+# @TEST-EXEC: btest-diff test.log
+
+@load tuning/enable-utf-8-logs
+
+redef LogAscii::set_separator = "\xc2\xae";
+
+module Test;
+
+export {
+	redef enum Log::ID += { LOG };
+
+	type Log: record {
+		ss: set[string];
+	} &log;
+}
+
+event zeek_init()
+	{
+	Log::create_stream(Test::LOG, [$columns=Log]);
+	Log::write(Test::LOG, [$ss=set("\xc2\xae")]);
+	}