test: add test for blob.LoadFileOrURL

Signed-off-by: Zachary Newman <z@znewman.net>

pkg/blob/load_test.go

@@ -0,0 +1,64 @@
+//
+// 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
+// limitations under the License.
+
+package blob
+
+import (
+	"bytes"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path"
+	"testing"
+)
+
+func TestLoadFileOrURL(t *testing.T) {
+	temp := t.TempDir()
+	fname := "filename.txt"
+	path := path.Join(temp, fname)
+	data := []byte("test")
+	defer os.Remove(path)
+	os.WriteFile(path, data, 0400)
+
+	// absolute path
+	actual, err := LoadFileOrURL(path)
+	if err != nil {
+		t.Errorf("Reading from absolute path %s failed: %v", path, err)
+	} else if !bytes.Equal(actual, data) {
+		t.Errorf("LoadFileOrURL(absolute path) = '%s'; want '%s'", actual, data)
+	}
+
+	if err = os.Chdir(temp); err != nil {
+		t.Fatalf("Chdir('%s'): %v", temp, err)
+	}
+	actual, err = LoadFileOrURL(fname)
+	if err != nil {
+		t.Errorf("Reading from relative path %s failed: %v", fname, err)
+	} else if !bytes.Equal(actual, data) {
+		t.Errorf("LoadFileOrURL(relative path) = '%s'; want '%s'", actual, data)
+	}
+
+	server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		rw.Write(data)
+	}))
+	defer server.Close()
+
+	actual, err = LoadFileOrURL(server.URL)
+	if err != nil {
+		t.Errorf("Reading from HTTP failed: %v", err)
+	} else if !bytes.Equal(actual, data) {
+		t.Errorf("LoadFileOrURL(HTTP) = '%s'; want '%s'", actual, data)
+	}
+}