diff --git a/test/life.js b/test/life.js
new file mode 100644
index 0000000..653b390
--- /dev/null
+++ b/test/life.js
@@ -0,0 +1,68 @@
+import test from 'ava'
+
+import {
+  countNeighbours,
+  deadOrAlive,
+  lifeStep
+} from '../src/life'
+
+test('Count neighbours', t => {
+  const grid = [
+    [0, 0, 0],
+    [0, 0, 1],
+    [0, 1, 0]]
+
+  const cn = countNeighbours(grid)
+  t.deepEqual(cn([0, 0]), [0, 0])
+  t.deepEqual(cn([0, 1]), [1, 0])
+  t.deepEqual(cn([0, 2]), [1, 0])
+  t.deepEqual(cn([1, 1]), [2, 0])
+  t.deepEqual(cn([2, 2]), [2, 0])
+  t.deepEqual(cn([1, 2]), [1, 1])
+})
+
+test('Dead or alive: from 0 to...', t => {
+  t.is(deadOrAlive([0, 0]), 0)
+  t.is(deadOrAlive([2, 0]), 0)
+  t.is(deadOrAlive([3, 0]), 1)
+  t.is(deadOrAlive([4, 0]), 0)
+  t.is(deadOrAlive([8, 0]), 0)
+})
+
+test('Dead or alive: from 1 to...', t => {
+  t.is(deadOrAlive([0, 1]), 0)
+  t.is(deadOrAlive([1, 1]), 0)
+  t.is(deadOrAlive([2, 1]), 1)
+  t.is(deadOrAlive([3, 1]), 1)
+  t.is(deadOrAlive([4, 1]), 0)
+  t.is(deadOrAlive([5, 1]), 0)
+})
+
+test('Life step: block', t => {
+  const block = [
+    [0, 0, 0, 0],
+    [0, 1, 1, 0],
+    [0, 1, 1, 0],
+    [0, 0, 0, 0]]
+
+  t.deepEqual(lifeStep(block), block)
+})
+
+test('Life step: blinker', t => {
+  const blinker1 = [
+    [0, 0, 0, 0, 0],
+    [0, 0, 1, 0, 0],
+    [0, 0, 1, 0, 0],
+    [0, 0, 1, 0, 0],
+    [0, 0, 0, 0, 0]]
+
+  const blinker2 = [
+    [0, 0, 0, 0, 0],
+    [0, 0, 0, 0, 0],
+    [0, 1, 1, 1, 0],
+    [0, 0, 0, 0, 0],
+    [0, 0, 0, 0, 0]]
+
+  t.deepEqual(lifeStep(blinker1), blinker2)
+  t.deepEqual(lifeStep(blinker2), blinker1)
+})