add mock http client

Signed-off-by: Meredith Lancaster <malancas@github.com>

pkg/cmd/attestation/api/client_test.go

@@ -25,6 +25,9 @@ func NewClientWithMockGHClient(hasNextPage bool) Client {
 			githubAPI: mockAPIClient{
 				OnRESTWithNext: fetcher.OnRESTSuccessWithNextPage,
 			},
+			httpClient: mockHttpClient{
+				OnGet: fetcher.OnGetSuccess,
+			},
 			logger: l,
 		}
 	}
@@ -33,6 +36,9 @@ func NewClientWithMockGHClient(hasNextPage bool) Client {
 		githubAPI: mockAPIClient{
 			OnRESTWithNext: fetcher.OnRESTSuccess,
 		},
+		httpClient: mockHttpClient{
+			OnGet: fetcher.OnGetSuccess,
+		},
 		logger: l,
 	}
 }

pkg/cmd/attestation/api/mock_client.go

@@ -25,7 +25,7 @@ func (m MockClient) GetTrustDomain() (string, error) {
 }
 
 func makeTestAttestation() Attestation {
-	return Attestation{Bundle: data.SigstoreBundle(nil)}
+	return Attestation{Bundle: data.SigstoreBundle(nil), BundleURL: "https://example.com"}
 }
 
 func OnGetByRepoAndDigestSuccess(repo, digest string, limit int) ([]*Attestation, error) {

pkg/cmd/attestation/api/mock_httpClient_test.go

@@ -0,0 +1,25 @@
+package api
+
+import (
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/cli/cli/v2/pkg/cmd/attestation/test/data"
+)
+
+type mockHttpClient struct {
+	OnGet func(url string) (*http.Response, error)
+}
+
+func (m mockHttpClient) Get(url string) (*http.Response, error) {
+	return m.OnGet(url)
+}
+
+func (m *mockDataGenerator) OnGetSuccess(url string) (*http.Response, error) {
+	bundle := data.SigstoreBundle(nil)
+	return &http.Response{
+		StatusCode: 200,
+		Body:       io.NopCloser(strings.NewReader(bundle.String())),
+	}, nil
+}