diff --git a/encoding/gsm7_test.go b/encoding/gsm7_test.go
index 6a5b3fb..d982e16 100644
--- a/encoding/gsm7_test.go
+++ b/encoding/gsm7_test.go
@@ -5,13 +5,23 @@ import (
 	"testing"
 )
 
+var (
+	short8nString = "Sunshine"
+	longNot8nString = "Golden rays play, Chasing night away."
+	long8nString  = "Ducks are fucking great, they quacks, O quackers, what the fuck."
+
+	short8nStringEncodedBytes = []byte{0b11010011, 0b10111010, 0b01111011, 0b10001110, 0b01001110, 0b10111011, 0b11001011}
+	longNot8nStringEncodedBytes = []byte{0b11000111, 0b00110111, 0b10011011, 0b01011100, 0b01110110, 0b10000011, 0b11100100, 0b11100001, 0b11111100, 0b00011100, 0b00000100, 0b01100111, 0b10000111, 0b11110011, 0b00101100, 0b11010000, 0b00010000, 0b00011101, 0b10011110, 0b10100111, 0b11011101, 0b01100111, 0b10010000, 0b00111011, 0b01111101, 0b01000110, 0b11010011, 0b01000001, 0b11100001, 0b01111011, 0b00111000, 0b11101111, 0b00000010}
+	long8nStringEncodedBytes = []byte{0b11000100, 0b11111010, 0b01111000, 0b00111101, 0b00000111, 0b10000101, 0b11100101, 0b01100101, 0b10010000, 0b10111001, 0b00111110, 0b01011110, 0b10100111, 0b11011101, 0b01100111, 0b11010000, 0b01011001, 0b01011110, 0b00001110, 0b11010011, 0b01011001, 0b00100000, 0b00111010, 0b10111010, 0b10011100, 0b00000111, 0b11000101, 0b11101011, 0b11100001, 0b11110001, 0b01111010, 0b11001110, 0b00000010, 0b00111101, 0b01000001, 0b11110001, 0b01111010, 0b01111000, 0b10111100, 0b00101110, 0b11001011, 0b11100111, 0b00101100, 0b11010000, 0b00011101, 0b00011101, 0b10100110, 0b10000011, 0b11101000, 0b11101000, 0b00110010, 0b11001000, 0b01011100, 0b00011111, 0b10101111, 0b01011101}
+)
+
 // region encode
 func TestGSM7EncodeSimpleASCIIString(t *testing.T) {
 	coder := &GSM7Coder{}
 	var buf bytes.Buffer
-	input := "Sunshine"
+	input := short8nString
 
-	expected := []byte{0b11010011, 0b10111010, 0b01111011, 0b10001110, 0b01001110, 0b10111011, 0b11001011}
+	expected := short8nStringEncodedBytes
 	err := coder.Encode(input, &buf)
 
 	if err != nil {
@@ -26,9 +36,9 @@ func TestGSM7EncodeSimpleASCIIString(t *testing.T) {
 func TestGSM7EncodeComplexASCIIString(t *testing.T) {
 	coder := &GSM7Coder{}
 	var buf bytes.Buffer
-	input := "Golden rays play, Chasing night away."
+	input := longNot8nString
 
-	expected := []byte{0b11000111, 0b00110111, 0b10011011, 0b01011100, 0b01110110, 0b10000011, 0b11100100, 0b11100001, 0b11111100, 0b00011100, 0b00000100, 0b01100111, 0b10000111, 0b11110011, 0b00101100, 0b11010000, 0b00010000, 0b00011101, 0b10011110, 0b10100111, 0b11011101, 0b01100111, 0b10010000, 0b00111011, 0b01111101, 0b01000110, 0b11010011, 0b01000001, 0b11100001, 0b01111011, 0b00111000, 0b11101111, 0b00000010}
+	expected := longNot8nStringEncodedBytes
 	err := coder.Encode(input, &buf)
 
 	if err != nil {
@@ -45,7 +55,7 @@ func TestGSM7EncodeComplex8nASCIIString(t *testing.T) {
 	var buf bytes.Buffer
 	input := "Ducks are fucking great, they quacks, O quackers, what the fuck."
 
-	expected := []byte{0b11000100, 0b11111010, 0b01111000, 0b00111101, 0b00000111, 0b10000101, 0b11100101, 0b01100101, 0b10010000, 0b10111001, 0b00111110, 0b01011110, 0b10100111, 0b11011101, 0b01100111, 0b11010000, 0b01011001, 0b01011110, 0b00001110, 0b11010011, 0b01011001, 0b00100000, 0b00111010, 0b10111010, 0b10011100, 0b00000111, 0b11000101, 0b11101011, 0b11100001, 0b11110001, 0b01111010, 0b11001110, 0b00000010, 0b00111101, 0b01000001, 0b11110001, 0b01111010, 0b01111000, 0b10111100, 0b00101110, 0b11001011, 0b11100111, 0b00101100, 0b11010000, 0b00011101, 0b00011101, 0b10100110, 0b10000011, 0b11101000, 0b11101000, 0b00110010, 0b11001000, 0b01011100, 0b00011111, 0b10101111, 0b01011101}
+	expected := long8nStringEncodedBytes
 	err := coder.Encode(input, &buf)
 
 	if err != nil {
@@ -78,9 +88,9 @@ func TestGSM7EncodeEmptyString(t *testing.T) {
 func TestGSM7DecodeSimpleASCIIString(t *testing.T) {
 	coder := &GSM7Coder{}
 	var buf bytes.Buffer
-	input := []byte{0b11010011, 0b10111010, 0b01111011, 0b10001110, 0b01001110, 0b10111011, 0b11001011}
+	input := short8nStringEncodedBytes
 
-	expected := "Sunshine"
+	expected := short8nString
 	buf.Write(input)
 	actual, err := coder.Decode(&buf)
 
@@ -96,9 +106,9 @@ func TestGSM7DecodeSimpleASCIIString(t *testing.T) {
 // func TestGSM7DecodeComplexASCIIString(t *testing.T) {
 // 	coder := &GSM7Coder{}
 // 	var buf bytes.Buffer
-// 	input := []byte{0b11000111, 0b00110111, 0b10011011, 0b01011100, 0b01110110, 0b10000011, 0b11100100, 0b11100001, 0b11111100, 0b00011100, 0b00000100, 0b01100111, 0b10000111, 0b11110011, 0b00101100, 0b11010000, 0b00010000, 0b00011101, 0b10011110, 0b10100111, 0b11011101, 0b01100111, 0b10010000, 0b00111011, 0b01111101, 0b01000110, 0b11010011, 0b01000001, 0b11100001, 0b01111011, 0b00111000, 0b11101111, 0b00000010}
+// 	input := longNot8nStringEncodedBytes
 
-// 	expected := "Golden rays play, Chasing night away."
+// 	expected := longNot8nString
 // 	buf.Write(input)
 // 	actual, err := coder.Decode(&buf)
 
@@ -114,9 +124,9 @@ func TestGSM7DecodeSimpleASCIIString(t *testing.T) {
 // func TestGSM7DecodeComplex8nASCIIString(t *testing.T) {
 // 	coder := &GSM7Coder{}
 // 	var buf bytes.Buffer
-// 	input := []byte{0b11000100, 0b11111010, 0b01111000, 0b00111101, 0b00000111, 0b10000101, 0b11100101, 0b01100101, 0b10010000, 0b10111001, 0b00111110, 0b01011110, 0b10100111, 0b11011101, 0b01100111, 0b11010000, 0b01011001, 0b01011110, 0b00001110, 0b11010011, 0b01011001, 0b00100000, 0b00111010, 0b10111010, 0b10011100, 0b00000111, 0b11000101, 0b11101011, 0b11100001, 0b11110001, 0b01111010, 0b11001110, 0b00000010, 0b00111101, 0b01000001, 0b11110001, 0b01111010, 0b01111000, 0b10111100, 0b00101110, 0b11001011, 0b11100111, 0b00101100, 0b11010000, 0b00011101, 0b00011101, 0b10100110, 0b10000011, 0b11101000, 0b11101000, 0b00110010, 0b11001000, 0b01011100, 0b00011111, 0b10101111, 0b01011101}
+// 	input := long8nStringEncodedBytes
 
-// 	expected := "Ducks are fucking great, they quacks, O quackers, what the fuck."
+// 	expected := long8nString
 // 	buf.Write(input)
 // 	actual, err := coder.Decode(&buf)
 
@@ -221,7 +231,7 @@ func TestDeletesLastValue(t *testing.T) {
 
 // region misc tests
 func TestGSM7EncodesIntoSmallString(t *testing.T) {
-	input := "Sunshine"
+	input := short8nString
 	expected := 7
 	actual := EncodesInto(&input)
 	if actual != expected {
@@ -230,7 +240,7 @@ func TestGSM7EncodesIntoSmallString(t *testing.T) {
 }
 
 func TestGSM7EncodesIntoLargerNot8nString(t *testing.T) {
-	input := "Golden rays play, Chasing night away."
+	input := longNot8nString
 	expected := 33
 	actual := EncodesInto(&input)
 	if actual != expected {
@@ -239,7 +249,7 @@ func TestGSM7EncodesIntoLargerNot8nString(t *testing.T) {
 }
 
 func TestGSM7EncodesIntoLarger8nString(t *testing.T) {
-	input := "Ducks are fucking great, they quacks, O quackers, what the fuck."
+	input := long8nString
 	expected := 56
 	actual := EncodesInto(&input)
 	if actual != expected {
@@ -248,7 +258,7 @@ func TestGSM7EncodesIntoLarger8nString(t *testing.T) {
 }
 
 func TestGSM7DecodesIntoSmallString(t *testing.T) {
-	input := []byte{0b11010011, 0b10111010, 0b01111011, 0b10001110, 0b01001110, 0b10111011, 0b11001011}
+	input := short8nStringEncodedBytes
 	expected := 8
 	actual := DecodesInto(bytes.NewBuffer(input))
 	if actual != expected {
@@ -257,7 +267,7 @@ func TestGSM7DecodesIntoSmallString(t *testing.T) {
 }
 
 func TestGSM7DecodesIntoLargerNot8nString(t *testing.T) {
-	input := []byte{0b11000111, 0b00110111, 0b10011011, 0b01011100, 0b01110110, 0b10000011, 0b11100100, 0b11100001, 0b11111100, 0b00011100, 0b00000100, 0b01100111, 0b10000111, 0b11110011, 0b00101100, 0b11010000, 0b00010000, 0b00011101, 0b10011110, 0b10100111, 0b11011101, 0b01100111, 0b10010000, 0b00111011, 0b01111101, 0b01000110, 0b11010011, 0b01000001, 0b11100001, 0b01111011, 0b00111000, 0b11101111, 0b00000010}
+	input := longNot8nStringEncodedBytes
 	expected := 37
 	actual := DecodesInto(bytes.NewBuffer(input))
 	if actual != expected {
@@ -266,7 +276,7 @@ func TestGSM7DecodesIntoLargerNot8nString(t *testing.T) {
 }
 
 func TestGSM7DecodesIntoLarger8nString(t *testing.T) {
-	input := []byte{0b11000100, 0b11111010, 0b01111000, 0b00111101, 0b00000111, 0b10000101, 0b11100101, 0b01100101, 0b10010000, 0b10111001, 0b00111110, 0b01011110, 0b10100111, 0b11011101, 0b01100111, 0b11010000, 0b01011001, 0b01011110, 0b00001110, 0b11010011, 0b01011001, 0b00100000, 0b00111010, 0b10111010, 0b10011100, 0b00000111, 0b11000101, 0b11101011, 0b11100001, 0b11110001, 0b01111010, 0b11001110, 0b00000010, 0b00111101, 0b01000001, 0b11110001, 0b01111010, 0b01111000, 0b10111100, 0b00101110, 0b11001011, 0b11100111, 0b00101100, 0b11010000, 0b00011101, 0b00011101, 0b10100110, 0b10000011, 0b11101000, 0b11101000, 0b00110010, 0b11001000, 0b01011100, 0b00011111, 0b10101111, 0b01011101}
+	input := long8nStringEncodedBytes
 	expected := 64
 	actual := DecodesInto(bytes.NewBuffer(input))
 	if actual != expected {
@@ -278,7 +288,7 @@ func TestGSM7DecodesIntoLarger8nString(t *testing.T) {
 func BenchmarkGSM7EncodeSimpleASCIIString(b *testing.B) {
 	coder := &GSM7Coder{}
 	var buf bytes.Buffer
-	input := "Sunshine"
+	input := short8nString
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
@@ -289,7 +299,7 @@ func BenchmarkGSM7EncodeSimpleASCIIString(b *testing.B) {
 func BenchmarkGSM7EncodeComplexASCIIString(b *testing.B) {
 	coder := &GSM7Coder{}
 	var buf bytes.Buffer
-	input := "Golden rays play, Chasing night away."
+	input := longNot8nString
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
@@ -300,7 +310,7 @@ func BenchmarkGSM7EncodeComplexASCIIString(b *testing.B) {
 func BenchmarkGSM7EncodeComplex8nASCIIString(b *testing.B) {
 	coder := &GSM7Coder{}
 	var buf bytes.Buffer
-	input := "Ducks are fucking great, they quacks, O quackers, what the fuck."
+	input := long8nString
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {