diff --git a/utils/time_test.go b/utils/time_test.go
new file mode 100644
index 0000000..191b565
--- /dev/null
+++ b/utils/time_test.go
@@ -0,0 +1,44 @@
+package utils
+
+import (
+	"testing"
+	"time"
+)
+
+func TestWithPrecision(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    time.Time
+		expected time.Time
+	}{
+		{
+			name:     "Round to microsecond precision",
+			input:    time.Date(2023, 4, 15, 12, 30, 45, 123456789, time.UTC),
+			expected: time.Date(2023, 4, 15, 12, 30, 45, 123457000, time.UTC),
+		},
+		{
+			name:     "Already at microsecond precision",
+			input:    time.Date(2023, 4, 15, 12, 30, 45, 123000000, time.UTC),
+			expected: time.Date(2023, 4, 15, 12, 30, 45, 123000000, time.UTC),
+		},
+		{
+			name:     "Round up to next microsecond",
+			input:    time.Date(2023, 4, 15, 12, 30, 45, 123999999, time.UTC),
+			expected: time.Date(2023, 4, 15, 12, 30, 45, 124000000, time.UTC),
+		},
+		{
+			name:     "Round down to previous microsecond",
+			input:    time.Date(2023, 4, 15, 12, 30, 45, 123000001, time.UTC),
+			expected: time.Date(2023, 4, 15, 12, 30, 45, 123000000, time.UTC),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := WithPrecision(tt.input)
+			if !result.Equal(tt.expected) {
+				t.Errorf("WithPrecision(%v) = %v, want %v", tt.input, result, tt.expected)
+			}
+		})
+	}
+}