mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
328 lines
8.7 KiB
Go
328 lines
8.7 KiB
Go
// Copyright 2018 The Cockroach 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 datadriven
|
|
|
|
import (
|
|
"bufio"
|
|
"flag"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
"strconv"
|
|
"strings"
|
|
"testing"
|
|
)
|
|
|
|
var (
|
|
rewriteTestFiles = flag.Bool(
|
|
"rewrite", false,
|
|
"ignore the expected results and rewrite the test files with the actual results from this "+
|
|
"run. Used to update tests when a change affects many cases; please verify the testfile "+
|
|
"diffs carefully!",
|
|
)
|
|
)
|
|
|
|
// RunTest invokes a data-driven test. The test cases are contained in a
|
|
// separate test file and are dynamically loaded, parsed, and executed by this
|
|
// testing framework. By convention, test files are typically located in a
|
|
// sub-directory called "testdata". Each test file has the following format:
|
|
//
|
|
// <command>[,<command>...] [arg | arg=val | arg=(val1, val2, ...)]...
|
|
// <input to the command>
|
|
// ----
|
|
// <expected results>
|
|
//
|
|
// The command input can contain blank lines. However, by default, the expected
|
|
// results cannot contain blank lines. This alternate syntax allows the use of
|
|
// blank lines:
|
|
//
|
|
// <command>[,<command>...] [arg | arg=val | arg=(val1, val2, ...)]...
|
|
// <input to the command>
|
|
// ----
|
|
// ----
|
|
// <expected results>
|
|
//
|
|
// <more expected results>
|
|
// ----
|
|
// ----
|
|
//
|
|
// To execute data-driven tests, pass the path of the test file as well as a
|
|
// function which can interpret and execute whatever commands are present in
|
|
// the test file. The framework invokes the function, passing it information
|
|
// about the test case in a TestData struct. The function then returns the
|
|
// actual results of the case, which this function compares with the expected
|
|
// results, and either succeeds or fails the test.
|
|
func RunTest(t *testing.T, path string, f func(d *TestData) string) {
|
|
t.Helper()
|
|
file, err := os.OpenFile(path, os.O_RDWR, 0644 /* irrelevant */)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer func() {
|
|
_ = file.Close()
|
|
}()
|
|
|
|
runTestInternal(t, path, file, f, *rewriteTestFiles)
|
|
}
|
|
|
|
// RunTestFromString is a version of RunTest which takes the contents of a test
|
|
// directly.
|
|
func RunTestFromString(t *testing.T, input string, f func(d *TestData) string) {
|
|
t.Helper()
|
|
runTestInternal(t, "<string>" /* optionalPath */, strings.NewReader(input), f, *rewriteTestFiles)
|
|
}
|
|
|
|
func runTestInternal(
|
|
t *testing.T, sourceName string, reader io.Reader, f func(d *TestData) string, rewrite bool,
|
|
) {
|
|
t.Helper()
|
|
|
|
r := newTestDataReader(t, sourceName, reader, rewrite)
|
|
for r.Next(t) {
|
|
t.Run("", func(t *testing.T) {
|
|
d := &r.data
|
|
actual := func() string {
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
fmt.Printf("\npanic during %s:\n%s\n", d.Pos, d.Input)
|
|
panic(r)
|
|
}
|
|
}()
|
|
actual := f(d)
|
|
if !strings.HasSuffix(actual, "\n") {
|
|
actual += "\n"
|
|
}
|
|
return actual
|
|
}()
|
|
|
|
if r.rewrite != nil {
|
|
r.emit("----")
|
|
if hasBlankLine(actual) {
|
|
r.emit("----")
|
|
r.rewrite.WriteString(actual)
|
|
r.emit("----")
|
|
r.emit("----")
|
|
} else {
|
|
r.emit(actual)
|
|
}
|
|
} else if d.Expected != actual {
|
|
t.Fatalf("\n%s: %s\nexpected:\n%s\nfound:\n%s", d.Pos, d.Input, d.Expected, actual)
|
|
} else if testing.Verbose() {
|
|
input := d.Input
|
|
if input == "" {
|
|
input = "<no input to command>"
|
|
}
|
|
// TODO(tbg): it's awkward to reproduce the args, but it would be helpful.
|
|
fmt.Printf("\n%s:\n%s [%d args]\n%s\n----\n%s", d.Pos, d.Cmd, len(d.CmdArgs), input, actual)
|
|
}
|
|
})
|
|
if t.Failed() {
|
|
t.FailNow()
|
|
}
|
|
}
|
|
|
|
if r.rewrite != nil {
|
|
data := r.rewrite.Bytes()
|
|
if l := len(data); l > 2 && data[l-1] == '\n' && data[l-2] == '\n' {
|
|
data = data[:l-1]
|
|
}
|
|
if dest, ok := reader.(*os.File); ok {
|
|
if _, err := dest.WriteAt(data, 0); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if err := dest.Truncate(int64(len(data))); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if err := dest.Sync(); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
} else {
|
|
t.Logf("input is not a file; rewritten output is:\n%s", data)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Walk goes through all the files in a subdirectory, creating subtests to match
|
|
// the file hierarchy; for each "leaf" file, the given function is called.
|
|
//
|
|
// This can be used in conjunction with RunTest. For example:
|
|
//
|
|
// datadriven.Walk(t, path, func (t *testing.T, path string) {
|
|
// // initialize per-test state
|
|
// datadriven.RunTest(t, path, func (d *datadriven.TestData) {
|
|
// // ...
|
|
// }
|
|
// }
|
|
//
|
|
// Files:
|
|
// testdata/typing
|
|
// testdata/logprops/scan
|
|
// testdata/logprops/select
|
|
//
|
|
// If path is "testdata/typing", the function is called once and no subtests
|
|
// care created.
|
|
//
|
|
// If path is "testdata/logprops", the function is called two times, in
|
|
// separate subtests /scan, /select.
|
|
//
|
|
// If path is "testdata", the function is called three times, in subtest
|
|
// hierarchy /typing, /logprops/scan, /logprops/select.
|
|
//
|
|
func Walk(t *testing.T, path string, f func(t *testing.T, path string)) {
|
|
finfo, err := os.Stat(path)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if !finfo.IsDir() {
|
|
f(t, path)
|
|
return
|
|
}
|
|
files, err := ioutil.ReadDir(path)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
for _, file := range files {
|
|
t.Run(file.Name(), func(t *testing.T) {
|
|
Walk(t, filepath.Join(path, file.Name()), f)
|
|
})
|
|
}
|
|
}
|
|
|
|
// TestData contains information about one data-driven test case that was
|
|
// parsed from the test file.
|
|
type TestData struct {
|
|
Pos string // reader and line number
|
|
|
|
// Cmd is the first string on the directive line (up to the first whitespace).
|
|
Cmd string
|
|
|
|
CmdArgs []CmdArg
|
|
|
|
Input string
|
|
Expected string
|
|
}
|
|
|
|
// ScanArgs looks up the first CmdArg matching the given key and scans it into
|
|
// the given destinations in order. If the arg does not exist, the number of
|
|
// destinations does not match that of the arguments, or a destination can not
|
|
// be populated from its matching value, a fatal error results.
|
|
//
|
|
// For example, for a TestData originating from
|
|
//
|
|
// cmd arg1=50 arg2=yoruba arg3=(50, 50, 50)
|
|
//
|
|
// the following would be valid:
|
|
//
|
|
// var i1, i2, i3, i4 int
|
|
// var s string
|
|
// td.ScanArgs(t, "arg1", &i1)
|
|
// td.ScanArgs(t, "arg2", &s)
|
|
// td.ScanArgs(t, "arg3", &i2, &i3, &i4)
|
|
func (td *TestData) ScanArgs(t *testing.T, key string, dests ...interface{}) {
|
|
t.Helper()
|
|
var arg CmdArg
|
|
for i := range td.CmdArgs {
|
|
if td.CmdArgs[i].Key == key {
|
|
arg = td.CmdArgs[i]
|
|
break
|
|
}
|
|
}
|
|
if arg.Key == "" {
|
|
t.Fatalf("missing argument: %s", key)
|
|
}
|
|
if len(dests) != len(arg.Vals) {
|
|
t.Fatalf("%s: got %d destinations, but %d values", arg.Key, len(dests), len(arg.Vals))
|
|
}
|
|
|
|
for i := range dests {
|
|
arg.Scan(t, i, dests[i])
|
|
|
|
}
|
|
}
|
|
|
|
// CmdArg contains information about an argument on the directive line. An
|
|
// argument is specified in one of the following forms:
|
|
// - argument
|
|
// - argument=value
|
|
// - argument=(values, ...)
|
|
type CmdArg struct {
|
|
Key string
|
|
Vals []string
|
|
}
|
|
|
|
func (arg CmdArg) String() string {
|
|
switch len(arg.Vals) {
|
|
case 0:
|
|
return arg.Key
|
|
|
|
case 1:
|
|
return fmt.Sprintf("%s=%s", arg.Key, arg.Vals[0])
|
|
|
|
default:
|
|
return fmt.Sprintf("%s=(%s)", arg.Key, strings.Join(arg.Vals, ", "))
|
|
}
|
|
}
|
|
|
|
// Scan attempts to parse the value at index i into the dest.
|
|
func (arg CmdArg) Scan(t *testing.T, i int, dest interface{}) {
|
|
if i < 0 || i >= len(arg.Vals) {
|
|
t.Fatalf("cannot scan index %d of key %s", i, arg.Key)
|
|
}
|
|
val := arg.Vals[i]
|
|
switch dest := dest.(type) {
|
|
case *string:
|
|
*dest = val
|
|
case *int:
|
|
n, err := strconv.ParseInt(val, 10, 64)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
*dest = int(n) // assume 64bit ints
|
|
case *uint64:
|
|
n, err := strconv.ParseUint(val, 10, 64)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
*dest = n
|
|
case *bool:
|
|
b, err := strconv.ParseBool(val)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
*dest = b
|
|
default:
|
|
t.Fatalf("unsupported type %T for destination #%d (might be easy to add it)", dest, i+1)
|
|
}
|
|
}
|
|
|
|
// Fatalf wraps a fatal testing error with test file position information, so
|
|
// that it's easy to locate the source of the error.
|
|
func (td TestData) Fatalf(tb testing.TB, format string, args ...interface{}) {
|
|
tb.Helper()
|
|
tb.Fatalf("%s: %s", td.Pos, fmt.Sprintf(format, args...))
|
|
}
|
|
|
|
func hasBlankLine(s string) bool {
|
|
scanner := bufio.NewScanner(strings.NewReader(s))
|
|
for scanner.Scan() {
|
|
if strings.TrimSpace(scanner.Text()) == "" {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|