test: add simple benchmark

Author: muthukrishnan24

parser_bench_test.go

@@ -0,0 +1,32 @@
+package parser_test
+
+import (
+	"testing"
+
+	. "github.com/conventionalcommit/parser"
+)
+
+var sampleCommit = `feat(scope): description
+
+this is first line in body
+
+this is second line in body
+
+Ref: #123
+Date: 01-01-2021
+By: John Doe`
+
+// regex Compile everytime
+// BenchmarkParser-4   	    7255	    156239 ns/op	  126473 B/op	     761 allocs/op
+
+// regex Compile once
+// BenchmarkParser-4   	  179227	      6531 ns/op	    1478 B/op	      23 allocs/op
+
+func BenchmarkParser(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		_, err := Parse(sampleCommit)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}