feat: yaaay first stem

packages/utils/src/flatTree.test.ts

@@ -0,0 +1,76 @@
+import { expect, test } from 'vitest'
+import { decode, encode, concat_encoded } from './flat_tree'
+
+test("it correctly concats nested arrays", () => {
+
+  const input_a = encode([1, 2, 3]);
+  const input_b = 2;
+  const input_c = encode([4, 5, 6]);
+
+  const output = concat_encoded([input_a, input_b, input_c]);
+
+  const decoded = decode(output);
+
+  expect(decoded[0]).toEqual([1, 2, 3]);
+
+
+});
+
+// Original test case
+test('it correctly decodes/encodes complex nested arrays', () => {
+  const input = [5, [6, 1], 1, 5, [5], [7, 2, [5, 1]]];
+  const decoded = decode(encode(input));
+  expect(decoded).toEqual(input);
+});
+
+// Test with empty array
+test('it correctly handles an empty array', () => {
+  const input: number[] = [];
+  const decoded = decode(encode(input));
+  expect(decoded).toEqual(input);
+});
+
+// Test with nested empty arrays
+test('it correctly handles nested empty arrays', () => {
+  const input = [5, [], [6, []], []];
+  const decoded = decode(encode(input));
+  expect(decoded).toEqual(input);
+});
+
+// Test with single-element array
+test('it correctly handles a single-element array', () => {
+  const input = [42];
+  const decoded = decode(encode(input));
+  expect(decoded).toEqual(input);
+});
+
+// Test with deeply nested array
+test('it correctly handles deeply nested arrays', () => {
+  const input = [[[[[1]]]]];
+  const decoded = decode(encode(input));
+  expect(decoded).toEqual(input);
+});
+
+// Test with large numbers
+test('it correctly handles large numbers', () => {
+  const input = [2147483647, [-2147483648, 1234567890]];
+  const decoded = decode(encode(input));
+  expect(decoded).toEqual(input);
+});
+
+// Test with sequential nesting
+test('it correctly handles sequential nesting', () => {
+  const input = [1, [2, [3, [4, [5]]]]];
+  const decoded = decode(encode(input));
+  expect(decoded).toEqual(input);
+});
+
+// Test with mixed data types (if supported)
+// Note: This test assumes your implementation supports mixed types. 
+// If not, you can ignore or remove this test.
+test('it correctly handles arrays with mixed data types', () => {
+  const input = [1, 'text', [true, [null, ['another text']]]];
+  //@ts-ignore
+  const decoded = decode(encode(input));
+  expect(decoded).toEqual(input);
+});