diff --git a/.github/workflows/run-tests.yaml b/.github/workflows/run-tests.yaml
new file mode 100644
index 0000000..8e18e29
--- /dev/null
+++ b/.github/workflows/run-tests.yaml
@@ -0,0 +1,21 @@
+name: Run tests
+
+on:
+  pull_request:
+
+jobs:
+  debug-builds:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: "recursive"
+
+      - name: Install Lua
+        uses: leafo/gh-actions-lua@v10
+        with:
+          luaVersion: "5.4.6"
+
+      - name: Run tests
+        run: lua -v ./tests/$(ls ./tests)
+
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..4b72ba1
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "luaunit"]
+	path = luaunit
+	url = https://github.com/bluebird75/luaunit
diff --git a/luaunit b/luaunit
new file mode 160000
index 0000000..0e0d3dd
--- /dev/null
+++ b/luaunit
@@ -0,0 +1 @@
+Subproject commit 0e0d3dd06fe1955a01f0e6763bc8dc6847ee3e8d
diff --git a/tests/test_utils.lua b/tests/test_utils.lua
new file mode 100644
index 0000000..e934dbb
--- /dev/null
+++ b/tests/test_utils.lua
@@ -0,0 +1,198 @@
+local lu = require"luaunit.luaunit"
+local utils = require"lua.jsonfly.utils"
+
+function testBasicKey()
+    local key = "foo.bar"
+    ---@type KeyDescription[]
+    local EXPECTED = {
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "foo",
+        },
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "bar",
+        }
+    }
+
+    local descriptor = utils:extract_key_description(key)
+
+    lu.assertEquals(descriptor, EXPECTED)
+end
+
+function testArrayKey()
+    local key = "foo.0.bar"
+    ---@type KeyDescription[]
+    local EXPECTED = {
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "foo",
+        },
+        {
+            type = "array_wrapper",
+        },
+        {
+            type = "array_index",
+            key = 0,
+        },
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "bar",
+        }
+    }
+
+    local descriptor = utils:extract_key_description(key)
+
+    lu.assertEquals(descriptor, EXPECTED)
+end
+
+function testNestedArrayKey()
+    local key = "foo.0.bar.1.baz"
+    ---@type KeyDescription[]
+    local EXPECTED = {
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "foo",
+        },
+        {
+            type = "array_wrapper",
+        },
+        {
+            type = "array_index",
+            key = 0,
+        },
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "bar",
+        },
+        {
+            type = "array_wrapper",
+        },
+        {
+            type = "array_index",
+            key = 1,
+        },
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "baz",
+        }
+    }
+
+    local descriptor = utils:extract_key_description(key)
+
+    lu.assertEquals(descriptor, EXPECTED)
+end
+
+function testEscapedArrayDoesNotCreateArray()
+    local key = "foo.\\0.bar"
+    ---@type KeyDescription[]
+    local EXPECTED = {
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "foo",
+        },
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "0",
+        },
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "bar",
+        }
+    }
+
+    local descriptor = utils:extract_key_description(key)
+
+    lu.assertEquals(descriptor, EXPECTED)
+end
+
+function testBracketArrayKey()
+    local key = "foo.[0].bar"
+    ---@type KeyDescription[]
+    local EXPECTED = {
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "foo",
+        },
+        {
+            type = "array_wrapper",
+        },
+        {
+            type = "array_index",
+            key = 0,
+        },
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "bar",
+        }
+    }
+
+    local descriptor = utils:extract_key_description(key)
+
+    lu.assertEquals(descriptor, EXPECTED)
+end
+
+function testRootArrayKey()
+    local key = "0.foo"
+    ---@type KeyDescription[]
+    local EXPECTED = {
+        {
+            type = "array_wrapper",
+        },
+        {
+            type = "array_index",
+            key = 0,
+        },
+        {
+            type = "object_wrapper",
+        },
+        {
+            type = "key",
+            key = "foo",
+        }
+    }
+
+    local descriptor = utils:extract_key_description(key)
+
+    lu.assertEquals(descriptor, EXPECTED)
+end
+
+
+os.exit( lu.LuaUnit.run() )
+