test(power_of_two): reuse assertion message (#36)

Author: mrz1836

power_of_two_test.go

@@ -6,16 +6,18 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+const powerOfTwoMessage = "%d should be a power of 2"
+
 func TestIsPowerOf2(t *testing.T) {
 	// Testing the function
 	numbers := []int{1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 1048576, 70368744177664}
 	for _, num := range numbers {
-		assert.True(t, IsPowerOfTwo(num), "%d should be a power of 2", num)
+		assert.True(t, IsPowerOfTwo(num), powerOfTwoMessage, num)
 	}
 
 	numbers = []int{-1, 0, 41, 13}
 	for _, num := range numbers {
-		assert.False(t, IsPowerOfTwo(num), "%d should be a power of 2", num)
+		assert.False(t, IsPowerOfTwo(num), powerOfTwoMessage, num)
 	}
 }
 
@@ -25,6 +27,6 @@ func TestNextLowerPowerOf2(t *testing.T) {
 	expected := []uint{16, 32, 64, 128, 0, 131072}
 
 	for i, num := range numbers {
-		assert.Equal(t, expected[i], NextLowerPowerOfTwo(num), "%d should be a power of 2", num)
+		assert.Equal(t, expected[i], NextLowerPowerOfTwo(num), powerOfTwoMessage, num)
 	}
 }