test(): add basic tests

test/rox_test.exs

@@ -1,8 +1,33 @@
 defmodule RoxTest do
-  use ExUnit.Case
+  use ExUnit.Case, async: false
   doctest Rox
 
-  test "the truth" do
-    assert 1 + 1 == 2
+  setup do
+    path = Path.join(__DIR__, "test.rocksdb")
+    {:ok, db} = Rox.open(path, create_if_missing: true)
+
+    on_exit fn ->
+      Rox.close(db)
+      File.rm_rf(path)
+      :ok
+    end
+
+    {:ok, %{db: db}}
+  end
+
+  test "simple put and get", %{db: db} do
+    assert :not_found = Rox.get(db, "key")
+    :ok = Rox.put(db, "key", "val")
+
+    assert {:ok, "val"} = Rox.get(db, "key")
+  end
+
+  test "stream_keys", %{db: db} do
+    :ok = Rox.put(db, "key", "val")
+
+    count = Rox.stream_keys(db)
+    |> Enum.count
+
+    assert count == 1
   end
 end