Add client options testing (#562)

Signed-off-by: Nathan Smith <nathan@chainguard.dev>

pkg/api/client_test.go

@@ -0,0 +1,62 @@
+//
+// Copyright 2021 The Sigstore Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+
+package api
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestUserAgentOption(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("User-Agent") != "foo" {
+			t.Error(`expected user-agent to be set to "foo"`)
+		}
+	}))
+
+	lc := NewClient(nil, WithUserAgent("foo"))
+	c, ok := lc.(*client)
+	if !ok {
+		t.Fatal("wrong legacy client implementation")
+	}
+
+	_, err := c.client.Get(ts.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestTimeoutOption(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		time.Sleep(10 * time.Second)
+	}))
+
+	lc := NewClient(nil, WithTimeout(time.Second))
+	c, ok := lc.(*client)
+	if !ok {
+		t.Fatal("wrong legacy client implementation")
+	}
+
+	_, err := c.client.Get(ts.URL)
+	if err == nil {
+		t.Error("expected client to get timeout error on request")
+	}
+	if strings.HasPrefix(err.Error(), "context deadline exceeded") {
+		t.Error("expected client to specifically have a timeout error")
+	}
+}