Add feature testing

.gitignore

@@ -20,3 +20,4 @@
 .DS_Store
 .history/
 tests.go
+coverage.xml

README.md

@@ -76,7 +76,7 @@ func main() {
 ## Testing
 
 ``` bash
-$ make ...
+$ go test
 ```
 
 ## Changelog

feature_test.go

@@ -0,0 +1,36 @@
+package idvalidator
+
+import "testing"
+
+// go test -v -cover -coverprofile=cover.out
+// go tool cover -func=cover.out
+// go tool cover -html=cover.out
+func TestFeature(t *testing.T) {
+	isValid1 := IsValid(FakeId())
+	if !isValid1 {
+		t.Errorf("`isValid1` must be true.")
+	}
+
+	isValid2 := IsValid(FakeRequireId(true, "江苏省", "200001", 1))
+	if !isValid2 {
+		t.Errorf("`isValid2` must be true.")
+	}
+
+	_, err1 := GetInfo(FakeRequireId(true, "江苏省", "200001", 1))
+	if err1 != nil {
+		t.Errorf("`err1` must be nil.")
+	}
+
+	_, err2 := GetInfo(FakeRequireId(true, "江苏省", "200001", 1))
+	if err2 != nil {
+		t.Errorf("`err2` must be nil.")
+	}
+
+	upgradedId, err3 := UpgradeId("610104620927690")
+	if err3 != nil {
+		t.Errorf("`err3` must be nil.")
+	}
+	if len(upgradedId) != 18 {
+		t.Errorf("`upgradedId`  length must be 18.:%d", len(upgradedId))
+	}
+}