Adding GetAlbum method and unite tests

Signed-off-by: Kris Nóva <kris@nivenly.com>

test/album_test.go

@@ -0,0 +1,23 @@
+package test
+
+import (
+	"testing"
+)
+
+func TestHappyGetAlbum(t *testing.T) {
+	_, err := Client.V1().GetAlbum(WellKnownAlbumID)
+	if err != nil {
+		t.Errorf("expected success getting well known album: %v", err)
+		t.FailNow()
+	}
+}
+
+func TestSadGetAlbum(t *testing.T) {
+	album, err := Client.V1().GetAlbum(UnknownAlbumID)
+	if err != nil {
+		t.Logf("success returning error for unknown album: %v", err)
+		return
+	}
+	t.Errorf("expected error for unknown album: %d", album.ID)
+	t.FailNow()
+}