From 7a0d076bb969b0c2b02b83f8395e7b9006b41084 Mon Sep 17 00:00:00 2001
From: Minjie Zha <minjiezha@gmail.com>
Date: Sat, 8 Apr 2017 10:30:52 -0700
Subject: [PATCH] add Module and BaseModule. Closes #1

---
 module.go      | 16 ++++++++++++++++
 module_test.go | 12 ++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 module.go
 create mode 100644 module_test.go

diff --git a/module.go b/module.go
new file mode 100644
index 0000000..229d786
--- /dev/null
+++ b/module.go
@@ -0,0 +1,16 @@
+package alice
+
+// Module is a marker interface for structs that defines how to initialize instances.
+type Module interface {
+	// IsModule indicates if this is a module.
+	IsModule() bool
+}
+
+// BaseModule is an implementation of Module interface. It should be embeded into each module defined in the
+// application.
+type BaseModule struct{}
+
+// IsModule indicates it is a module.
+func (b *BaseModule) IsModule() bool {
+	return true
+}
diff --git a/module_test.go b/module_test.go
new file mode 100644
index 0000000..9ad9e6c
--- /dev/null
+++ b/module_test.go
@@ -0,0 +1,12 @@
+package alice
+
+import (
+	"testing"
+)
+
+func TestBaseModule(t *testing.T) {
+	var base Module = &BaseModule{}
+	if !base.IsModule() {
+		t.Error("BaseModule is expected to be a Module, but it is not")
+	}
+}