Add context_test.go for unit test

Author: baptistedonaux

context_test.go

@@ -0,0 +1,13 @@
+package dockergen
+
+import (
+	"testing"
+)
+
+func TestGetCurrentContainerID(t *testing.T) {
+	currentContainerID := GetCurrentContainerID()
+
+	if len(currentContainerID) != 64 {
+		t.Fail()
+	}
+}