diff --git a/tests/core.test.js b/tests/core.test.js
new file mode 100644
index 0000000..355865b
--- /dev/null
+++ b/tests/core.test.js
@@ -0,0 +1,18 @@
+import { describe, expect, test } from "vitest";
+import { evolve1d, create1dStateOneCell } from "src/modules/core.js";
+import { presetRuleset } from "src/modules/preset.js";
+
+describe("Core", () => {
+  test("evolve1d, rules73, 9 cells", () => {
+    const state = [0, 0, 0, 0, 1, 0, 0, 0, 0];
+    const got = evolve1d(state, presetRuleset[0].rules);
+    const valid = [1, 1, 1, 0, 0, 0, 1, 1, 1];
+    expect(got.length).toBe(state.length);
+    expect(got).toEqual(valid);
+  }),
+    test("create1dStateOneCell, 49 cells", () => {
+      const got = create1dStateOneCell(49);
+      expect(got.length).toBe(49);
+      expect(got[24]).toBe(1);
+    });
+});