add integration test + testdata

test/integration_test.go

@@ -0,0 +1,111 @@
+package test
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+var (
+  update = flag.Bool("update", false, "update .golden files")
+)
+
+var binaryName = "clibgen"
+var binaryPath = ""
+
+func TestMain(m *testing.M) {
+  flag.Parse()
+
+  err := os.Chdir("..")
+  if err != nil {
+    fmt.Printf("could not change dir: %v", err)
+    os.Exit(1)
+  }
+
+  dir, err := os.Getwd()
+
+  if err != nil {
+    fmt.Printf("could not get current dir: %v", err)
+  }
+
+  binaryPath = filepath.Join(dir, binaryName)
+
+  os.Exit(m.Run())
+}
+
+
+func runBinary(args []string) ([]byte, error) {
+  cmd := exec.Command(binaryPath, args...)
+  cmd.Env = append(os.Environ(), "GOCOVERDIR=.coverdata")
+  return cmd.CombinedOutput()
+}
+
+func TestCliArgs(t *testing.T) {
+	tests := []struct {
+		name    string
+		args    []string
+		fixture string
+	}{
+		// {"no arguments", []string{}, "no-args.golden"},
+    {"help args", []string{"--help"}, "help.golden"},
+		// {"one argument", []string{"ciao"}, "one-argument.golden"},
+		// {"multiple arguments", []string{"ciao", "hello"}, "multiple-arguments.golden"},
+		// {"shout arg", []string{"--shout", "ciao"}, "shout-arg.golden"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			output, err := runBinary(tt.args)
+
+			if err != nil {
+				t.Fatal(err)
+			}
+
+      fmt.Println(string(output))
+
+			if *update {
+				writeFixture(t, tt.fixture, output)
+			}
+
+			actual := string(output)
+
+			expected := loadFixture(t, tt.fixture)
+
+			if !reflect.DeepEqual(actual, expected) {
+				t.Fatalf("actual = %s, expected = %s", actual, expected)
+			}
+		})
+	}
+}
+
+func writeFixture(t *testing.T, goldenFile string, actual []byte) {
+	t.Helper()
+	goldenPath := "testdata/" + goldenFile
+
+	f, err := os.OpenFile(goldenPath, os.O_RDWR, 0644)
+	defer f.Close()
+
+  _, err = f.WriteString(string(actual))
+
+  if err != nil {
+    t.Fatalf("Error writing to file %s: %s", goldenPath, err)
+  }
+}
+
+func loadFixture(t *testing.T, goldenFile string) string {
+	goldenPath := "testdata/" + goldenFile
+
+  f, err := os.OpenFile(goldenPath, os.O_RDWR, 0644)
+
+  content, err := ioutil.ReadAll(f)
+  if err != nil {
+    t.Fatalf("Error opening file %s: %s", goldenPath, err)
+  }
+
+  return string(content)
+}

testdata/help.golden

@@ -0,0 +1,17 @@
+
+Clibgen is a CLI application to search and download epubs, pdfs, from library genesis. 
+Useful if you are lazy to open up a browser to download e-books/resources.
+
+Usage:
+  clibgen [command]
+
+Available Commands:
+  completion  Generate the autocompletion script for the specified shell
+  help        Help about any command
+  search      search for a book, paper or article
+
+Flags:
+  -h, --help     help for clibgen
+  -t, --toggle   Help message for toggle
+
+Use "clibgen [command] --help" for more information about a command.