Add missing tests for go/event/syslogger (#15005)

Signed-off-by: Noble Mittal <[email protected]>

go/event/syslogger/fake_logger_test.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2024 The Vitess Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package syslogger
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetLogsForNoLogs(t *testing.T) {
+	tl := NewTestLogger()
+	errLoggerMsg := tl.getLog()
+
+	want := loggerMsg{
+		msg:   "no logs!",
+		level: "ERROR",
+	}
+
+	assert.Equal(t, errLoggerMsg, want)
+}
+
+func TestGetAllLogs(t *testing.T) {
+	tl := NewTestLogger()
+	tl.recordInfof("Test info log")
+	tl.recordErrorf("Test error log")
+	tl.recordWarningf("Test warning log")
+
+	want := []string{"INFO:Test info log", "ERROR:Test error log", "WARNING:Test warning log"}
+	loggerMsgs := tl.GetAllLogs()
+
+	assert.Equal(t, loggerMsgs, want)
+}