feat(api): add NumPackages to mirrors/repos/snapshots list responses

add API response wrappers with NumPackages derived from RefList length; keep show endpoint payloads unchanged for backward compatibility; add API tests for list endpoint NumPackages; update swagger response schemas for list endpoints

api/snapshot_test.go

@@ -0,0 +1,45 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+
+	"github.com/gin-gonic/gin"
+	. "gopkg.in/check.v1"
+)
+
+type SnapshotsSuite struct {
+	APISuite
+}
+
+var _ = Suite(&SnapshotsSuite{})
+
+func (s *SnapshotsSuite) TestGetSnapshotsIncludesNumPackages(c *C) {
+	body, err := json.Marshal(gin.H{"Name": "count-snapshot-list"})
+	c.Assert(err, IsNil)
+
+	response, err := s.HTTPRequest("POST", "/api/snapshots", bytes.NewReader(body))
+	c.Assert(err, IsNil)
+	c.Assert(response.Code, Equals, 201)
+
+	response, err = s.HTTPRequest("GET", "/api/snapshots", nil)
+	c.Assert(err, IsNil)
+	c.Assert(response.Code, Equals, 200)
+
+	var snapshots []map[string]interface{}
+	err = json.Unmarshal(response.Body.Bytes(), &snapshots)
+	c.Assert(err, IsNil)
+
+	found := false
+	for _, snapshot := range snapshots {
+		if snapshot["Name"] == "count-snapshot-list" {
+			found = true
+			value, ok := snapshot["NumPackages"]
+			c.Assert(ok, Equals, true)
+			c.Assert(value, Equals, float64(0))
+			break
+		}
+	}
+
+	c.Assert(found, Equals, true)
+}