Add marketplace APIs (#43)

* Add marketplace APIs

marketplace_test.go

@@ -0,0 +1,76 @@
+package discogs
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"testing"
+)
+
+const testReleaseID = 9893847
+
+func MarketplaceServer(w http.ResponseWriter, r *http.Request) {
+	if r.Method != "GET" {
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		return
+	}
+
+	switch r.URL.Path {
+	case "/marketplace" + priceSuggestionsURI + strconv.Itoa(testReleaseID):
+		w.WriteHeader(http.StatusOK)
+		if _, err := io.WriteString(w, priceSuggestionJson); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+	case "/marketplace" + releaseStatsURI + strconv.Itoa(testReleaseID):
+		w.WriteHeader(http.StatusOK)
+		if _, err := io.WriteString(w, releaseStatsJson); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+	default:
+		w.WriteHeader(http.StatusMethodNotAllowed)
+	}
+}
+
+func TestMarketplacePriceSuggestions(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(MarketplaceServer))
+	defer ts.Close()
+
+	d := initDiscogsClient(t, &Options{URL: ts.URL})
+
+	suggestion, err := d.PriceSuggestions(testReleaseID)
+	if err != nil {
+		t.Fatalf("failed to get price suggestion: %s", err)
+	}
+
+	json, err := json.Marshal(suggestion)
+	if err != nil {
+		t.Fatalf("failed to marshal folder: %s", err)
+	}
+
+	compareJson(t, string(json), priceSuggestionJson)
+}
+
+func TestMarketplaceReleaseStatistics(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(MarketplaceServer))
+	defer ts.Close()
+
+	d := initDiscogsClient(t, &Options{URL: ts.URL})
+
+	stats, err := d.ReleaseStatistics(testReleaseID)
+	if err != nil {
+		t.Fatalf("failed to get price suggestion: %s", err)
+	}
+
+	json, err := json.Marshal(stats)
+	if err != nil {
+		t.Fatalf("failed to marshal folder: %s", err)
+	}
+
+	compareJson(t, string(json), releaseStatsJson)
+}