Create internal/thestore/event.Event and merge method

render-2023-10-11/internal/thestore/event.go

@@ -0,0 +1,26 @@
+package thestore
+
+type Event struct {
+	ID     string `json:"service-id"`
+	Region string `json:"region"`
+	Status string `json:"status"`
+	URL    string `json:"url"`
+}
+
+func (event Event) Push(operation Event) Event {
+	if event.ID != operation.ID {
+		panic(operation)
+	}
+
+	if operation.Region != "" {
+		event.Region = operation.Region
+	}
+	if operation.Status != "" {
+		event.Status = operation.Status
+	}
+	if operation.URL != "" {
+		event.URL = operation.URL
+	}
+
+	return event
+}

render-2023-10-11/internal/thestore/event_test.go

@@ -0,0 +1,61 @@
+package thestore_test
+
+import (
+	"render231011/internal/thestore"
+	"testing"
+)
+
+func TestEventMerging(t *testing.T) {
+	cases := map[string]struct {
+		base      thestore.Event
+		operation thestore.Event
+		want      thestore.Event
+	}{
+		"noop on noop": {},
+		"add to nothing": {
+			base: thestore.Event{
+				ID: "x",
+			},
+			operation: thestore.Event{
+				ID:     "x",
+				Region: "newregion",
+				Status: "newstatus",
+				URL:    "newurl",
+			},
+			want: thestore.Event{
+				ID:     "x",
+				Region: "newregion",
+				Status: "newstatus",
+				URL:    "newurl",
+			},
+		},
+		"change region": {
+			base: thestore.Event{
+				ID:     "x",
+				Region: "region",
+				Status: "status",
+				URL:    "url",
+			},
+			operation: thestore.Event{
+				ID:     "x",
+				Region: "newregion",
+			},
+			want: thestore.Event{
+				ID:     "x",
+				Region: "newregion",
+				Status: "status",
+				URL:    "url",
+			},
+		},
+	}
+
+	for name, d := range cases {
+		c := d
+		t.Run(name, func(t *testing.T) {
+			got := c.base.Push(c.operation)
+			if got != c.want {
+				t.Errorf("wanted \n\t%+v, got\n\t%+v", c.want, got)
+			}
+		})
+	}
+}