diff --git a/src/index.test.js b/src/index.test.js
index 6fe0ca6..f203ef6 100644
--- a/src/index.test.js
+++ b/src/index.test.js
@@ -1,70 +1,111 @@
 const hilberCurve = require("../");
 
-test("[truth] order=2, index=0", () => {
+test("[indexToPoint] order=0, index=0", () => {
+  expect(hilberCurve.indexToPoint(0, 0)).toEqual({ x: 0, y: 0 });
+});
+
+test("[indexToPoint] order=1, index=0", () => {
+  expect(hilberCurve.indexToPoint(0, 1)).toEqual({ x: 0, y: 0 });
+});
+
+test("[indexToPoint] order=1, index=1", () => {
+  expect(hilberCurve.indexToPoint(1, 1)).toEqual({ x: 0, y: 1 });
+});
+
+test("[indexToPoint] order=1, index=2", () => {
+  expect(hilberCurve.indexToPoint(2, 1)).toEqual({ x: 1, y: 1 });
+});
+
+test("[indexToPoint] order=1, index=3", () => {
+  expect(hilberCurve.indexToPoint(3, 1)).toEqual({ x: 1, y: 0 });
+});
+
+test("[indexToPoint] order=2, index=0", () => {
   expect(hilberCurve.indexToPoint(0, 2)).toEqual({ x: 0, y: 0 });
 });
 
-test("[truth] order=2, index=1", () => {
+test("[indexToPoint] order=2, index=1", () => {
   expect(hilberCurve.indexToPoint(1, 2)).toEqual({ x: 1, y: 0 });
 });
 
-test("[truth] order=2, index=2", () => {
+test("[indexToPoint] order=2, index=2", () => {
   expect(hilberCurve.indexToPoint(2, 2)).toEqual({ x: 1, y: 1 });
 });
 
-test("[truth] order=2, index=3", () => {
+test("[indexToPoint] order=2, index=3", () => {
   expect(hilberCurve.indexToPoint(3, 2)).toEqual({ x: 0, y: 1 });
 });
 
-test("[truth] order=2, index=4", () => {
+test("[indexToPoint] order=2, index=4", () => {
   expect(hilberCurve.indexToPoint(4, 2)).toEqual({ x: 0, y: 2 });
 });
 
-test("[truth] order=2, index=5", () => {
+test("[indexToPoint] order=2, index=5", () => {
   expect(hilberCurve.indexToPoint(5, 2)).toEqual({ x: 0, y: 3 });
 });
 
-test("[truth] order=2, index=6", () => {
+test("[indexToPoint] order=2, index=6", () => {
   expect(hilberCurve.indexToPoint(6, 2)).toEqual({ x: 1, y: 3 });
 });
 
-test("[truth] order=2, index=7", () => {
+test("[indexToPoint] order=2, index=7", () => {
   expect(hilberCurve.indexToPoint(7, 2)).toEqual({ x: 1, y: 2 });
 });
 
-test("[truth] order=2, index=8", () => {
+test("[indexToPoint] order=2, index=8", () => {
   expect(hilberCurve.indexToPoint(8, 2)).toEqual({ x: 2, y: 2 });
 });
 
-test("[truth] order=2, index=9", () => {
+test("[indexToPoint] order=2, index=9", () => {
   expect(hilberCurve.indexToPoint(9, 2)).toEqual({ x: 2, y: 3 });
 });
 
-test("[truth] order=2, index=10", () => {
+test("[indexToPoint] order=2, index=10", () => {
   expect(hilberCurve.indexToPoint(10, 2)).toEqual({ x: 3, y: 3 });
 });
 
-test("[truth] order=2, index=11", () => {
+test("[indexToPoint] order=2, index=11", () => {
   expect(hilberCurve.indexToPoint(11, 2)).toEqual({ x: 3, y: 2 });
 });
 
-test("[truth] order=2, index=12", () => {
+test("[indexToPoint] order=2, index=12", () => {
   expect(hilberCurve.indexToPoint(12, 2)).toEqual({ x: 3, y: 1 });
 });
 
-test("[truth] order=2, index=13", () => {
+test("[indexToPoint] order=2, index=13", () => {
   expect(hilberCurve.indexToPoint(13, 2)).toEqual({ x: 2, y: 1 });
 });
 
-test("[truth] order=2, index=14", () => {
+test("[indexToPoint] order=2, index=14", () => {
   expect(hilberCurve.indexToPoint(14, 2)).toEqual({ x: 2, y: 0 });
 });
 
-test("[truth] order=2, index=15", () => {
+test("[indexToPoint] order=2, index=15", () => {
   expect(hilberCurve.indexToPoint(15, 2)).toEqual({ x: 3, y: 0 });
 });
 
-test("[truth] order=2", () => {
+for (order = 0; order <= 5; order += 1) {
+  const n = Math.pow(2, order);
+  for (let index = 0; index < n * n; index += 1) {
+    test(`[roundtrip: indexToPoint/pointToIndex] order=${order}, index=${index}`, () => {
+      expect(
+        hilberCurve.pointToIndex(hilberCurve.indexToPoint(index, order), order)
+      ).toBe(index);
+    });
+  }
+}
+
+test("[construct] order=0", () => {
+  const data = [1];
+  expect(hilberCurve.construct(data, 0)).toEqual([1]);
+});
+
+test("[construct] order=1", () => {
+  const data = [1, 2, 3, 4];
+  expect(hilberCurve.construct(data, 1)).toEqual([1, 4, 2, 3]);
+});
+
+test("[construct] order=2", () => {
   const data = Array.from({ length: 4 * 4 }, (_, i) => i + 1);
   expect(hilberCurve.construct(data, 2)).toEqual([
     1,
@@ -85,14 +126,3 @@ test("[truth] order=2", () => {
     11
   ]);
 });
-
-for (order = 0; order <= 5; order += 1) {
-  const n = Math.pow(2, order);
-  for (let index = 0; index < n * n; index += 1) {
-    test(`[inversion] order=${order}, index=${index}`, () => {
-      expect(
-        hilberCurve.pointToIndex(hilberCurve.indexToPoint(index, order), order)
-      ).toBe(index);
-    });
-  }
-}