feat: implement lseq for golang

golang/lseq_test.go

@@ -0,0 +1,44 @@
+package lseq
+
+import (
+	"testing"
+)
+
+func TestStringEncoding(t *testing.T) {
+	// Basic sanity checks for encoding/decoding
+	cases := []struct {
+		numbers []uint64
+		want    string
+	}{
+		{[]uint64{0}, "-"},
+		{[]uint64{63}, "z"},
+		{[]uint64{0, 1}, "--0"},
+		{[]uint64{0, 4095}, "-zz"},
+	}
+
+	for _, tc := range cases {
+		got := numbersToID(tc.numbers)
+		if got != tc.want {
+			t.Errorf("numbersToID(%v) = %q, want %q", tc.numbers, got, tc.want)
+		}
+
+		parsed, err := idToNumbers(got)
+		if err != nil {
+			t.Errorf("idToNumbers(%q) failed: %v", got, err)
+			continue
+		}
+
+		if len(parsed) != len(tc.numbers) {
+			t.Errorf("Roundtrip failed: got %v, want %v", parsed, tc.numbers)
+		}
+	}
+}
+
+func TestPositionToKey(t *testing.T) {
+	if got := PositionToKey(2, 1); got != "--0" {
+		t.Errorf("PositionToKey(2, 1) = %q, want %q", got, "--0")
+	}
+	if got := PositionToKey(1, 1); got != "0" {
+		t.Errorf("PositionToKey(1, 1) = %q, want %q", got, "0")
+	}
+}