diff --git a/packages/immutadot/src/nav/sliceNav.spec.js b/packages/immutadot/src/nav/sliceNav.spec.js
index 750900af..3d85bbc7 100644
--- a/packages/immutadot/src/nav/sliceNav.spec.js
+++ b/packages/immutadot/src/nav/sliceNav.spec.js
@@ -1,25 +1,89 @@
 /* eslint-env jest */
-import { immutaTest } from 'test.utils'
+import { immutaTest, toRefs } from 'test.utils'
 import { sliceNav } from './sliceNav'
 
 describe('SliceNav', () => {
 
   it('should update a slice', () => {
-    const input = [0, 1]
     const next = value => ({
       update: updater => updater(value),
     })
     const updater = value => value + 1
 
-    const test = (params, expected) => {
-      const output = sliceNav(params, next)(input).update(updater)
+    const test = (params, expected) => immutaTest(
+      [0, 1, 2, 3],
+      expected.map((value, index) => value !== ([0, 1, 2, 3])[index] ? `${index}` : undefined).filter(index => index),
+      input => {
+        const output = sliceNav(params, next)(input).update(updater)
+        expect(output).toEqual(expected)
+        return output
+      },
+    )
+
+    test([0, undefined], [1, 2, 3, 4])
+    test([undefined, undefined], [1, 2, 3, 4])
+    test([1, undefined], [0, 2, 3, 4])
+    test([-2, undefined], [0, 1, 3, 4])
+    test([undefined, 2], [1, 2, 2, 3])
+    test([undefined, -1], [1, 2, 3, 3])
+    test([undefined, undefined, 2], [1, 1, 3, 3])
+    test([1, undefined, 2], [0, 2, 2, 4])
+    test([undefined, undefined, -1], [1, 2, 3, 4])
+    test([undefined, undefined, -2], [0, 2, 2, 4])
+    test([-2, undefined, -2], [1, 1, 3, 3])
+  })
+
+  it('should unset a slice', () => {
+    const next = () => ({
+      final: true,
+    })
+
+    const test = (params, expected) => immutaTest(
+      [0, 1, 2, 3],
+      expected.map((value, index) => value !== ([0, 1, 2, 3])[index] ? `${index}` : undefined).filter(index => index),
+      input => {
+        const output = sliceNav(params, next)(input).unset()
+        expect(output).toEqual(expected)
+        return output
+      },
+    )
 
-      expect(input).toEqual([0, 1])
-      expect(output).not.toBe(input)
-      expect(output).toEqual(expected)
+    test([0, undefined], [undefined, undefined, undefined, undefined])
+    test([undefined, undefined], [undefined, undefined, undefined, undefined])
+    test([1, undefined], [0, undefined, undefined, undefined])
+    test([-2, undefined], [0, 1, undefined, undefined])
+    test([undefined, 2], [undefined, undefined, 2, 3])
+    test([undefined, -1], [undefined, undefined, undefined, 3])
+    test([undefined, undefined, 2], [undefined, 1, undefined, 3])
+    test([1, undefined, 2], [0, undefined, 2, undefined])
+    test([undefined, undefined, -1], [undefined, undefined, undefined, undefined])
+    test([undefined, undefined, -2], [0, undefined, 2, undefined])
+    test([-2, undefined, -2], [undefined, 1, undefined, 3])
+  })
+
+  it('should get a slice', () => {
+    const input = [0, 1, 2, 3]
+    const inputRefs = toRefs(input)
+    const next = value => ({
+      get: () => value,
+    })
+
+    const test = (params, expected) => {
+      expect(sliceNav(params, next)(input).get()).toEqual(expected)
+      expect(input).toBeDeep(inputRefs)
     }
 
-    test([0, undefined], [1, 2])
+    test([0, undefined], [0, 1, 2, 3])
+    test([undefined, undefined], [0, 1, 2, 3])
+    test([1, undefined], [1, 2, 3])
+    test([-2, undefined], [2, 3])
+    test([undefined, 2], [0, 1])
+    test([undefined, -1], [0, 1, 2])
+    test([undefined, undefined, 2], [0, 2])
+    test([1, undefined, 2], [1, 3])
+    test([undefined, undefined, -1], [3, 2, 1, 0])
+    test([undefined, undefined, -2], [3, 1])
+    test([-2, undefined, -2], [2, 0])
   })
 
   it('should avoid unnecessary copies', () => {