Added test (serialization, deserialization) for the []string attr feature.

request_test.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"io"
 	"reflect"
+	"sort"
 	"strings"
 	"testing"
 	"time"
@@ -30,6 +31,39 @@ type ModelBadTypes struct {
 	TimePtrField *time.Time `jsonapi:"attr,time_ptr_field"`
 }
 
+func TestUnmarshall_attrStringSlice(t *testing.T) {
+	out := &Book{}
+	tags := []string{"fiction", "sale"}
+	data := map[string]interface{}{
+		"data": map[string]interface{}{
+			"type":       "books",
+			"id":         "1",
+			"attributes": map[string]interface{}{"tags": tags},
+		},
+	}
+	b, err := json.Marshal(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := UnmarshalPayload(bytes.NewReader(b), out); err != nil {
+		t.Fatal(err)
+	}
+
+	if e, a := len(tags), len(out.Tags); e != a {
+		t.Fatalf("Was expecting %d tags, got %d", e, a)
+	}
+
+	sort.Strings(tags)
+	sort.Strings(out.Tags)
+
+	for i, tag := range tags {
+		if e, a := tag, out.Tags[i]; e != a {
+			t.Fatalf("At index %d, was expecting %s got %s", i, e, a)
+		}
+	}
+}
+
 func TestUnmarshalToStructWithPointerAttr(t *testing.T) {
 	out := new(WithPointer)
 	in := map[string]interface{}{

response_test.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"reflect"
+	"sort"
 	"testing"
 	"time"
 )
@@ -83,6 +84,43 @@ type Book struct {
 	Description *string `jsonapi:"attr,description"`
 	Pages       *uint   `jsonapi:"attr,pages,omitempty"`
 	PublishedAt time.Time
+	Tags        []string `jsonapi:"attr,tags"`
+}
+
+func TestMarshall_attrStringSlice(t *testing.T) {
+	tags := []string{"fiction", "sale"}
+	b := &Book{ID: 1, Tags: tags}
+
+	out := bytes.NewBuffer(nil)
+	if err := MarshalOnePayload(out, b); err != nil {
+		t.Fatal(err)
+	}
+
+	var jsonData map[string]interface{}
+	if err := json.Unmarshal(out.Bytes(), &jsonData); err != nil {
+		t.Fatal(err)
+	}
+
+	jsonTags := jsonData["data"].(map[string]interface{})["attributes"].(map[string]interface{})["tags"].([]interface{})
+	if e, a := len(tags), len(jsonTags); e != a {
+		t.Fatalf("Was expecting tags of length %d got %d", e, a)
+	}
+
+	// Convert from []interface{} to []string
+	jsonTagsStrings := []string{}
+	for _, tag := range jsonTags {
+		jsonTagsStrings = append(jsonTagsStrings, tag.(string))
+	}
+
+	// Sort both
+	sort.Strings(jsonTagsStrings)
+	sort.Strings(tags)
+
+	for i, tag := range tags {
+		if e, a := tag, jsonTagsStrings[i]; e != a {
+			t.Fatalf("At index %d, was expecting %s got %s", i, e, a)
+		}
+	}
 }
 
 func TestWithoutOmitsEmptyAnnotationOnRelation(t *testing.T) {