Truncate long test names for better readability

Add makeTestName helper function to create reasonable test names from
long hex strings. TestDecodeByte and TestDecodeString now show concise
names like '9e06b37878787878...7878' instead of extremely long hex
strings that made test output unreadable.

Author: oschwald

internal/decoder/decoder_test.go

@@ -20,6 +20,14 @@ func newDecoderFromHex(t *testing.T, hexStr string) *Decoder {
 	return NewDecoder(dd, 0)         // [cite: 26]
 }
 
+// Helper function to create reasonable test names from potentially long hex strings.
+func makeTestName(hexStr string) string {
+	if len(hexStr) <= 20 {
+		return hexStr
+	}
+	return hexStr[:16] + "..." + hexStr[len(hexStr)-4:]
+}
+
 func TestDecodeBool(t *testing.T) {
 	tests := map[string]bool{
 		"0007": false, // [cite: 29]
@@ -192,7 +200,7 @@ func TestDecodeSlice(t *testing.T) {
 
 func TestDecodeString(t *testing.T) {
 	for hexStr, expected := range testStrings {
-		t.Run(hexStr, func(t *testing.T) {
+		t.Run(makeTestName(hexStr), func(t *testing.T) {
 			decoder := newDecoderFromHex(t, hexStr)
 			result, err := decoder.ReadString() // [cite: 32]
 			require.NoError(t, err)
@@ -219,7 +227,7 @@ func TestDecodeByte(t *testing.T) {
 	}
 
 	for hexStr, expected := range byteTests {
-		t.Run(hexStr, func(t *testing.T) {
+		t.Run(makeTestName(hexStr), func(t *testing.T) {
 			decoder := newDecoderFromHex(t, hexStr)
 			result, err := decoder.ReadBytes() // [cite: 34]
 			require.NoError(t, err)