Implement FROM_BASE64 function (#115)

pkg/stdlib/strings/decode_test.go

@@ -0,0 +1,46 @@
+package strings_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/MontFerret/ferret/pkg/runtime/values"
+
+	"github.com/MontFerret/ferret/pkg/stdlib/strings"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestFromBase64(t *testing.T) {
+	Convey("When args are not passed", t, func() {
+		Convey("It should return an error", func() {
+			var err error
+			_, err = strings.FromBase64(context.Background())
+
+			So(err, ShouldBeError)
+		})
+	})
+
+	Convey("When hash is not valid base64", t, func() {
+		Convey("It should return an error", func() {
+			var err error
+			_, err = strings.FromBase64(
+				context.Background(),
+				values.NewString("foobar"),
+			)
+
+			So(err, ShouldBeError)
+		})
+	})
+
+	Convey("Should decode a given hash", t, func() {
+		out, err := strings.FromBase64(
+			context.Background(),
+			values.NewString("Zm9vYmFy"),
+		)
+
+		So(err, ShouldBeNil)
+		So(out, ShouldNotEqual, "Zm9vYmFy")
+		So(out, ShouldEqual, "foobar")
+	})
+}