Add GetAllCustomPropertyValues for repositories (google#3020)

Fixes: google#3014.

github/repos_properties.go

@@ -0,0 +1,33 @@
+// Copyright 2023 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"context"
+	"fmt"
+)
+
+// GetAllCustomPropertyValues gets all custom property values that are set for a repository.
+//
+// GitHub API docs: https://docs.github.com/rest/repos/custom-properties#get-all-custom-property-values-for-a-repository
+//
+//meta:operation GET /repos/{owner}/{repo}/properties/values
+func (s *RepositoriesService) GetAllCustomPropertyValues(ctx context.Context, org, repo string) ([]*CustomPropertyValue, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/properties/values", org, repo)
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var customPropertyValues []*CustomPropertyValue
+	resp, err := s.client.Do(ctx, req, &customPropertyValues)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return customPropertyValues, resp, nil
+}

github/repos_properties_test.go

@@ -0,0 +1,65 @@
+// Copyright 2023 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestRepositoriesService_GetAllCustomPropertyValues(t *testing.T) {
+	client, mux, _, teardown := setup()
+	defer teardown()
+
+	mux.HandleFunc("/repos/o/r/properties/values", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		fmt.Fprint(w, `[
+		{
+          "property_name": "environment",
+          "value": "production"
+        },
+        {
+          "property_name": "service",
+          "value": "web"
+        }
+		]`)
+	})
+
+	ctx := context.Background()
+	customPropertyValues, _, err := client.Repositories.GetAllCustomPropertyValues(ctx, "o", "r")
+	if err != nil {
+		t.Errorf("Repositories.GetAllCustomPropertyValues returned error: %v", err)
+	}
+
+	want := []*CustomPropertyValue{
+		{
+			PropertyName: "environment",
+			Value:        String("production"),
+		},
+		{
+			PropertyName: "service",
+			Value:        String("web"),
+		},
+	}
+
+	if !cmp.Equal(customPropertyValues, want) {
+		t.Errorf("Repositories.GetAllCustomPropertyValues returned %+v, want %+v", customPropertyValues, want)
+	}
+
+	const methodName = "GetAllCustomPropertyValues"
+
+	testNewRequestAndDoFailure(t, methodName, client, func() (*Response, error) {
+		got, resp, err := client.Repositories.GetAllCustomPropertyValues(ctx, "o", "r")
+		if got != nil {
+			t.Errorf("testNewRequestAndDoFailure %v = %#v, want nil", methodName, got)
+		}
+		return resp, err
+	})
+}