claude: fold in old sow-tools

internal/gff/binary_test.go

@@ -0,0 +1,55 @@
+package gff
+
+import (
+	"bytes"
+	"encoding/json"
+	"testing"
+)
+
+func TestRoundTripBinaryAndJSON(t *testing.T) {
+	original := Document{
+		FileType:    "UTC ",
+		FileVersion: "V3.2",
+		Root: Struct{
+			Type: 0,
+			Fields: []Field{
+				NewField("Tag", StringValue("test_creature")),
+				NewField("TemplateResRef", ResRefValue("nw_test")),
+				NewField("HP", IntValue(12)),
+				NewField("Position", Vector{X: 1.25, Y: 2.5, Z: 3.75}),
+				NewField("Inventory", ListValue{
+					{
+						Type: 1,
+						Fields: []Field{
+							NewField("Slot", DWordValue(0)),
+							NewField("ResRef", ResRefValue("itm_sword")),
+						},
+					},
+				}),
+			},
+		},
+	}
+
+	var binaryBuf bytes.Buffer
+	if err := Write(&binaryBuf, original); err != nil {
+		t.Fatalf("write binary: %v", err)
+	}
+
+	decoded, err := Read(bytes.NewReader(binaryBuf.Bytes()))
+	if err != nil {
+		t.Fatalf("read binary: %v", err)
+	}
+
+	left, err := json.Marshal(original)
+	if err != nil {
+		t.Fatalf("marshal original json: %v", err)
+	}
+	right, err := json.Marshal(decoded)
+	if err != nil {
+		t.Fatalf("marshal decoded json: %v", err)
+	}
+
+	if string(left) != string(right) {
+		t.Fatalf("roundtrip mismatch\noriginal: %s\ndecoded:  %s", left, right)
+	}
+}