diff --git a/README.md b/README.md
index 7efd28ba..404b6fa6 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,12 @@ again with the same simple `esy` command.
 
     % esy
 
-And test compiled executable (runs `scripts.tests` specified in
+And run compiled executable (runs `scripts.run` specified in
+  `package.json`):
+
+    % esy run
+
+You can test your code (runs `scripts.test` specified in
 `package.json`):
 
     % esy test
diff --git a/lib/Util.re b/lib/Util.re
index 38a2fd4e..e6ace541 100644
--- a/lib/Util.re
+++ b/lib/Util.re
@@ -7,3 +7,5 @@ let hello = () =>
       "!"
     </Pastel>
   );
+
+let add = (a, b) => a + b;
diff --git a/lib/Util.rei b/lib/Util.rei
index 87630480..b98d20a7 100644
--- a/lib/Util.rei
+++ b/lib/Util.rei
@@ -6,3 +6,7 @@
     print_endline(hello());
     ]} */
 let hello: unit => string;
+
+/** A simple function to show how to write test.
+*/
+let add: (int, int) => int;
diff --git a/package.json b/package.json
index 316d4ffc..8b5067d1 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,8 @@
     }
   },
   "scripts": {
-    "test": "esy x Hello",
+    "test": "esy b dune exec ./test/TestRunner.exe #{self.root}",
+    "run": "esy x Hello",
     "format": "esy dune build @fmt --auto-promote",
     "doc": "esy dune build @doc"
   },
diff --git a/test/TestRunner.re b/test/TestRunner.re
new file mode 100644
index 00000000..e0c4e0be
--- /dev/null
+++ b/test/TestRunner.re
@@ -0,0 +1 @@
+TestLib.TestFramework.cli();
diff --git a/test/dune b/test/dune
new file mode 100644
index 00000000..f547de56
--- /dev/null
+++ b/test/dune
@@ -0,0 +1,3 @@
+(executable
+ (name TestRunner)
+ (libraries testLib))
diff --git a/test/lib/TestFramework.re b/test/lib/TestFramework.re
new file mode 100644
index 00000000..902fba13
--- /dev/null
+++ b/test/lib/TestFramework.re
@@ -0,0 +1,18 @@
+// In package.json we pass #{self.root} as first argument
+if (Array.length(Sys.argv) < 2)
+  failwith("pass the project root as first argument");
+let projectDir = Sys.argv[1];
+
+include Rely.Make({
+  let config =
+    Rely.TestFrameworkConfig.initialize({
+      snapshotDir:
+        Filename.(
+          projectDir
+          |> (dir => concat(dir, "test"))
+          |> (dir => concat(dir, "lib"))
+          |> (dir => Filename.concat(dir, "__snapshots__"))
+        ),
+      projectDir,
+    });
+});
diff --git a/test/lib/UtilTest.re b/test/lib/UtilTest.re
new file mode 100644
index 00000000..f6adb57a
--- /dev/null
+++ b/test/lib/UtilTest.re
@@ -0,0 +1,9 @@
+open TestFramework;
+
+open Lib;
+
+describe("Util", ({test, _}) => {
+  test("add", ({expect, _}) => {
+    expect.int(Util.add(3, 3)).toBe(6)
+  })
+});
diff --git a/test/lib/__snapshots__/.gitkeep b/test/lib/__snapshots__/.gitkeep
new file mode 100644
index 00000000..e69de29b
diff --git a/test/lib/dune b/test/lib/dune
new file mode 100644
index 00000000..73e37573
--- /dev/null
+++ b/test/lib/dune
@@ -0,0 +1,8 @@
+(library
+ (name testLib)
+ ; the linkall flag ensures that all of our tests are compiled and the
+ ; -g flag emits debugging information
+ (ocamlopt_flags -linkall -g)
+ ; you will want to depend on the library you are testing as well, however for
+ ; the purposes of this example we are only depending on the test runner itself
+ (libraries lib rely.lib))