Update tests

lzip_test.go

@@ -5,7 +5,6 @@
 package lzip_test
 
 import (
-	"math"
 	"testing"
 
 	"github.com/sorairolake/lzip-go"
@@ -14,75 +13,96 @@ import (
 func TestHeaderSize(t *testing.T) {
 	t.Parallel()
 
-	if size := lzip.HeaderSize; size != 6 {
-		t.Errorf("expected header size `%v`, got `%v`", 6, size)
+	const expected = 6
+
+	if size := lzip.HeaderSize; size != expected {
+		t.Errorf("expected header size `%v`, got `%v`", expected, size)
 	}
 }
 
 func TestTrailerSize(t *testing.T) {
 	t.Parallel()
 
-	if size := lzip.TrailerSize; size != 20 {
-		t.Errorf("expected trailer size `%v`, got `%v`", 20, size)
+	const expected = 20
+
+	if size := lzip.TrailerSize; size != expected {
+		t.Errorf("expected trailer size `%v`, got `%v`", expected, size)
 	}
 }
 
 func TestMagic(t *testing.T) {
 	t.Parallel()
 
-	if magic := lzip.Magic; magic != "LZIP" {
-		t.Errorf("expected magic number `%v`, got `%v`", "LZIP", magic)
+	const expected = "LZIP"
+
+	if magic := lzip.Magic; magic != expected {
+		t.Errorf("expected magic number `%v`, got `%v`", expected, magic)
 	}
 }
 
 func TestMagicSize(t *testing.T) {
 	t.Parallel()
 
-	if size := lzip.MagicSize; size != 4 {
-		t.Errorf("expected magic number size `%v`, got `%v`", 4, size)
+	const expected = 4
+
+	if size := lzip.MagicSize; size != expected {
+		t.Errorf("expected magic number size `%v`, got `%v`", expected, size)
 	}
 }
 
 func TestVersion(t *testing.T) {
 	t.Parallel()
 
-	if v0 := lzip.Version0; v0 != 0 {
-		t.Errorf("expected version number `%v`, got `%v`", 0, v0)
+	const (
+		expectedV0 = iota
+		expectedV1
+	)
+
+	if v0 := lzip.Version0; v0 != expectedV0 {
+		t.Errorf("expected version number `%v`, got `%v`", expectedV0, v0)
 	}
 
-	if v1 := lzip.Version1; v1 != 1 {
-		t.Errorf("expected version number `%v`, got `%v`", 1, v1)
+	if v1 := lzip.Version1; v1 != expectedV1 {
+		t.Errorf("expected version number `%v`, got `%v`", expectedV1, v1)
 	}
 }
 
 func TestMinDictSize(t *testing.T) {
 	t.Parallel()
 
-	if size := lzip.MinDictSize; size != (1 << 12) {
-		t.Errorf("expected minimum dictionary size `%v`, got `%v`", (1 << 12), size)
+	const expected = 1 << 12
+
+	if size := lzip.MinDictSize; size != expected {
+		t.Errorf("expected minimum dictionary size `%v`, got `%v`", expected, size)
 	}
 }
 
 func TestMaxDictSize(t *testing.T) {
 	t.Parallel()
 
-	if size := lzip.MaxDictSize; size != (1 << 29) {
-		t.Errorf("expected maximum dictionary size `%v`, got `%v`", (1 << 29), size)
+	const expected = 1 << 29
+
+	if size := lzip.MaxDictSize; size != expected {
+		t.Errorf("expected maximum dictionary size `%v`, got `%v`", expected, size)
 	}
 }
 
 func TestDefaultDictSize(t *testing.T) {
 	t.Parallel()
 
-	if size := uint32(lzip.DefaultDictSize); size != (8 * uint32(math.Pow(2.0, 20.0))) {
-		t.Errorf("expected default dictionary size `%v`, got `%v`", (8 * uint32(math.Pow(2.0, 20.0))), size)
+	const expected = 8 * (1 << 20)
+
+	if size := lzip.DefaultDictSize; size != expected {
+		t.Errorf("expected default dictionary size `%v`, got `%v`", expected, size)
 	}
 }
 
 func TestMaxMemberSize(t *testing.T) {
 	t.Parallel()
 
-	if size := uint64(lzip.MaxMemberSize); size != (2 * uint64(math.Pow(2.0, 50.0))) {
-		t.Errorf("expected maximum member size `%v`, got `%v`", (2 * uint64(math.Pow(2.0, 50.0))), size)
+	const expected = 2 * (1 << 50)
+
+	if size := lzip.MaxMemberSize; size != expected {
+		t.Errorf("expected maximum member size `%v`, got `%v`", expected, size)
 	}
 }