test: cover option-less Workwx ctor

Author: xen0n

client_test.go

@@ -0,0 +1,17 @@
+package workwx
+
+import (
+	"testing"
+
+	c "github.com/smartystreets/goconvey/convey"
+)
+
+func TestWorkwxCtor(t *testing.T) {
+	c.Convey("不带参数构造 Workwx 实例", t, func() {
+		a := New("testcorpid")
+
+		c.Convey("corpid 应该正确设置了", func() {
+			c.So(a.CorpID, c.ShouldEqual, "testcorpid")
+		})
+	})
+}