add tests

src/utils/utils_test.go

@@ -0,0 +1,29 @@
+package utils
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// Exists reports whether the named file or directory exists.
+func TestExists(t *testing.T) {
+	assert.True(t, Exists("utils.go"))
+}
+
+// HashFile returns the md5 hash of a file
+func TestHashFile(t *testing.T) {
+	b, err := HashFile("utils.go")
+	assert.Nil(t, err)
+	assert.Equal(t, "33303e23c9c5e9c194d50b399391754e", fmt.Sprintf("%x", b))
+}
+
+// SHA256 returns sha256 sum
+func TestSHA256(t *testing.T) {
+	assert.Equal(t, "09ca7e4eaa6e8ae9c7d261167129184883644d07dfba7cbfbc4c8a2e08360d5b", SHA256("hello, world"))
+}
+
+func TestByteCountDecimal(t *testing.T) {
+	assert.Equal(t, "10.0 kB", ByteCountDecimal(10000))
+}