diff --git a/zig-impl/crystal/some-crystal-app/src/tests.cr b/zig-impl/crystal/some-crystal-app/src/tests.cr
new file mode 100644
index 0000000..9ea7f9a
--- /dev/null
+++ b/zig-impl/crystal/some-crystal-app/src/tests.cr
@@ -0,0 +1,39 @@
+
+def test_without_wait()
+	ctx = Pointer(Void).null
+	LibIPC.init (pointerof(ctx))
+	fd : Int32 = 0
+	LibIPC.connect_service(ctx, pointerof(fd), "pong", 4)
+	pp! fd
+	LibIPC.write(ctx, fd, "Hello", 5)
+
+	buflen : LibC::UInt64T = 10
+	buffer = uninitialized UInt8[10]
+	LibIPC.read(ctx, fd, buffer.to_unsafe, pointerof(buflen))
+	received = String.new(buffer.to_unsafe, buflen)
+	pp! received
+
+	LibIPC.deinit (pointerof(ctx))
+end
+
+def test_with_wait()
+	ctx = Pointer(Void).null
+	LibIPC.init (pointerof(ctx))
+	fd : Int32 = 0
+	LibIPC.connect_service(ctx, pointerof(fd), "pong", 4)
+	LibIPC.write(ctx, fd, "Hello", 5)
+
+	buflen : LibC::UInt64T = 10
+	buffer = uninitialized UInt8[10]
+	eventtype : UInt8 = 0
+	index : LibC::UInt64T = 0
+
+	LibIPC.timer(ctx, 2000) # Wait at most 2 seconds.
+	LibIPC.wait(ctx, pointerof(eventtype), pointerof(index), pointerof(fd), buffer.to_unsafe, pointerof(buflen))
+
+	#pp! LibIPC::EventType.new(eventtype), fd, index, buflen
+	received = String.new(buffer.to_unsafe, buflen)
+	pp! received
+
+	LibIPC.deinit (pointerof(ctx))
+end