implemented chain of responsibility

behavioral/chain_of_responsibility/chain_of_responsibility_test.go

@@ -0,0 +1,36 @@
+package chain_of_responsibility
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestCORPattern(t *testing.T) {
+	book := Book{"Go design patterns", "Ismayil Malik"}
+	bytes, _ := json.Marshal(book)
+	bookDb := &BookDb{
+		make(map[string]Book),
+		nil,
+	}
+	logger := &Logger{
+		next: bookDb,
+	}
+	chain := &Deserializer{
+		next: logger,
+	}
+
+	t.Run(`It will be unmurshalled on deserializer handler then will be logged
+		  on logger handler and at the end will be presisted by third handler`, func(t *testing.T) {
+
+		err := chain.Handle(bytes)
+		if err != nil {
+			t.Fatalf("Something went wrong: %s", err.Error())
+		}
+
+		storedBook := bookDb.store[book.Title]
+		if storedBook != book {
+			t.Errorf("Expected %b but got %b", book, storedBook)
+		}
+	})
+
+}