Add SliceCmd.Scan() (hscan pkg) and tests

internal/hscan/hscan_test.go

@@ -0,0 +1,125 @@
+package hscan
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+type data struct {
+	Omit  string `redis:"-"`
+	Empty string
+
+	String string  `redis:"string"`
+	Bytes  []byte  `redis:"byte"`
+	Int    int     `redis:"int"`
+	Uint   uint    `redis:"uint"`
+	Float  float32 `redis:"float"`
+	Bool   bool    `redis:"bool"`
+}
+
+func TestGinkgoSuite(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "hscan")
+}
+
+var _ = Describe("Scan", func() {
+	It("catches bad args", func() {
+		var d data
+
+		Expect(Scan([]interface{}{}, &d)).NotTo(HaveOccurred())
+		Expect(d).To(Equal(data{}))
+
+		Expect(Scan([]interface{}{"key"}, &d)).To(HaveOccurred())
+		Expect(Scan([]interface{}{"key", "1", "2"}, &d)).To(HaveOccurred())
+		Expect(Scan([]interface{}{"key", "1"}, nil)).To(HaveOccurred())
+
+		var i map[string]interface{}
+		Expect(Scan([]interface{}{"key", "1"}, &i)).To(HaveOccurred())
+		Expect(Scan([]interface{}{"key", "1"}, data{})).To(HaveOccurred())
+		Expect(Scan([]interface{}{"key", nil, "string", nil}, data{})).To(HaveOccurred())
+	})
+
+	It("scans good values", func() {
+		var d data
+
+		// non-tagged fields.
+		Expect(Scan([]interface{}{"key", "value"}, &d)).NotTo(HaveOccurred())
+		Expect(d).To(Equal(data{}))
+
+		res := []interface{}{"string", "str!",
+			"byte", "bytes!",
+			"int", "123",
+			"uint", "456",
+			"float", "123.456",
+			"bool", "1"}
+		Expect(Scan(res, &d)).NotTo(HaveOccurred())
+		Expect(d).To(Equal(data{
+			String: "str!",
+			Bytes:  []byte("bytes!"),
+			Int:    123,
+			Uint:   456,
+			Float:  123.456,
+			Bool:   true,
+		}))
+
+		// Scan a different type with the same values to test that
+		// the struct spec maps don't conflict.
+		type data2 struct {
+			String string  `redis:"string"`
+			Bytes  []byte  `redis:"byte"`
+			Int    int     `redis:"int"`
+			Uint   uint    `redis:"uint"`
+			Float  float32 `redis:"float"`
+			Bool   bool    `redis:"bool"`
+		}
+		var d2 data2
+		Expect(Scan(res, &d2)).NotTo(HaveOccurred())
+		Expect(d2).To(Equal(data2{
+			String: "str!",
+			Bytes:  []byte("bytes!"),
+			Int:    123,
+			Uint:   456,
+			Float:  123.456,
+			Bool:   true,
+		}))
+
+		Expect(Scan([]interface{}{
+			"string", "",
+			"float", "1",
+			"bool", "t"}, &d)).NotTo(HaveOccurred())
+		Expect(d).To(Equal(data{
+			String: "",
+			Bytes:  []byte("bytes!"),
+			Int:    123,
+			Uint:   456,
+			Float:  1.0,
+			Bool:   true,
+		}))
+	})
+
+	It("omits untagged fields", func() {
+		var d data
+
+		Expect(Scan([]interface{}{
+			"empty", "value",
+			"omit", "value",
+			"string", "str!"}, &d)).NotTo(HaveOccurred())
+		Expect(d).To(Equal(data{
+			String: "str!",
+		}))
+	})
+
+	It("catches bad values", func() {
+		var d data
+
+		Expect(Scan([]interface{}{"int", "a"}, &d)).To(HaveOccurred())
+		Expect(Scan([]interface{}{"uint", "a"}, &d)).To(HaveOccurred())
+		Expect(Scan([]interface{}{"uint", ""}, &d)).To(HaveOccurred())
+		Expect(Scan([]interface{}{"float", "b"}, &d)).To(HaveOccurred())
+		Expect(Scan([]interface{}{"bool", "-1"}, &d)).To(HaveOccurred())
+		Expect(Scan([]interface{}{"bool", ""}, &d)).To(HaveOccurred())
+		Expect(Scan([]interface{}{"bool", "123"}, &d)).To(HaveOccurred())
+	})
+})