70-testing-and-benchmarking.go

package main
import (
  "fmt"
  "testing"
)

func IntMin(a, b int) int {
  if a < b {
    return a
  }

  return b
}

func TestIntMinBasic(t *testing.T){
  ans := IntMin(2, -2)
  if ans != -2 {
    t.Errorf("IntMin(2,-2) = %d; want -2",ans)
  }
}

func TestIntMinTableDriven(t *testing.T){
  var tests = []struct {
    a, b int
    want int
  }{
      {0,1,0},
      {1,0,0},
      {2,-2,-2},
      {0,-1,-1},
      {-1,0,-1},
    }
  for _, tt := range tests {
    testname := fmt.Sprintf("%d,%d",tt.a,tt.b)
    t.Run(testname, func(t *testing.T){
      ans := IntMin(tt.a,tt.b)
      if ans != tt.want {
        t.Errorf("got %d, want %d",ans, tt.want)
      }
    })
  }
}

func BenchMarkingIntMin(b *testing.B){
  for i:= 0; i<b.N; i++ {
    IntMin(1,2)
  }
}