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tc_test.go
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tc_test.go
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package main
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"reflect"
"testing"
)
// Usages Tests
//
// Basic idea: We want to test running tc with its different options like
// tc
// tc -nocolor
// tc -nofmt
// tc -nocolor -nofmt
//
// To do this, we mock os.Stdin and os.Stdout by creating an io.Reader from
// fake_test_output.txt and io.Writer from actual_output.txt. Run testcolor()
// with this reader and capture the output to writer. Do a file diff between
// actual_output.txt and expected_output.txt and assert no differences
func TestUsage(t *testing.T) {
var (
fakeOutputFile = "fake.txt"
actualOutputFile = "actual.txt"
expectedOutputFile = "expected.txt"
)
cases := []struct {
name string
dir string
opt *options
}{
{
name: "default",
dir: "testdata/default",
opt: &options{nofmt: false, nocolor: false},
},
{
name: "nocolor",
dir: "testdata/nocolor",
opt: &options{nofmt: false, nocolor: true},
},
{
name: "nofmt",
dir: "testdata/nofmt",
opt: &options{nofmt: true, nocolor: false},
},
{
name: "nofmtnocolor",
dir: "testdata/nofmtnocolor",
opt: &options{nofmt: true, nocolor: true},
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
// create our parser
p := newParser(tc.opt)
// mock os.Stdin
mockStdin, err := os.Open(filepath.Join(tc.dir, fakeOutputFile))
if err != nil {
t.Error(err)
}
defer close(t, mockStdin)
// mock os.Stdout
mockStdout, err := os.Create(filepath.Join(tc.dir, actualOutputFile))
if err != nil {
t.Error(err)
}
// Run output will be written to actual_output.txt and immediately
// close file once done
runTestColor(p, mockStdin, mockStdout)
close(t, mockStdout)
// Assert no difference
if filesEqual(t,
filepath.Join(tc.dir, actualOutputFile),
filepath.Join(tc.dir, expectedOutputFile),
) != 0 {
t.Error("Actual output file does not match expected")
}
})
}
// Cleanup function to delete files that get created in subtests, i.e. /testdata/*/actual.txt
t.Cleanup(func() {
for _, tc := range cases {
file := filepath.Join(tc.dir, actualOutputFile)
t.Log("Removing created file", file)
os.Remove(file)
}
})
}
func filesEqual(t *testing.T, pathA, pathB string) int {
a, err := os.Open(pathA)
if err != nil {
t.Error(err)
}
b, err := os.Open(pathB)
if err != nil {
t.Error(err)
}
bytesA, _ := ioutil.ReadAll(a)
bytesB, _ := ioutil.ReadAll(b)
return bytes.Compare(bytesA, bytesB)
}
func close(t *testing.T, c io.Closer) {
err := c.Close()
if err != nil {
t.Error(err)
}
}
func TestSearch(t *testing.T) {
cases := []struct {
data []byte
pattern []byte
n int
expected []int
}{
{
data: []byte(""),
pattern: []byte("bb"),
n: 1,
expected: nil,
},
{
data: []byte("aaaaa"),
pattern: []byte("c"),
n: 1,
expected: nil,
},
{
data: []byte("aaabbcc"),
pattern: []byte("bb"),
n: 1,
expected: []int{3},
},
{
data: []byte("aaabbb"),
pattern: []byte("bb"),
n: 2,
expected: []int{3, 4},
},
{
data: []byte("aaabbb"),
pattern: []byte("bb"),
n: 1,
expected: []int{3},
},
{
data: []byte("AABAACAADAABAABA"),
pattern: []byte("AABA"),
n: -1,
expected: []int{0, 9, 12},
},
{
data: []byte(" TestMockSubTest/two: mock_test.go:47: Here's another occurrence of _test.go"),
pattern: []byte("_test.go"),
n: 1,
expected: []int{29},
},
{
data: []byte("_test.go:47: bunch : of : colons:::"),
pattern: []byte(":"),
n: 2,
expected: []int{8, 11},
},
}
for i, tc := range cases {
t.Run(fmt.Sprintf("Test %v", i), func(t *testing.T) {
t.Logf("Searching text \"%s\" for pattern \"%s\"\n", tc.data, tc.pattern)
res := search(tc.data, tc.pattern, tc.n)
// We must deep equal to compare slices
if !reflect.DeepEqual(res, tc.expected) {
t.Errorf("Got %v Expected %v\n", res, tc.expected)
}
})
}
}
// Test search function with larger input data. Read in testdata/moby.txt and
// check it is the number of bytes we expect
//
// $ stat moby.txt
// size 1276201
// ...
//
// Then run our pattern search function and check it is the number we expect
//
// $ cat moby.txt | grep -o "good" | wc -l
// 201
func TestSearchWithLargerInput(t *testing.T) {
testFilePath := "testdata/moby.txt"
expectedSize := 1276201
expectedMatches := 201
data, err := ioutil.ReadFile(testFilePath)
if err != nil {
t.Fatal(err)
}
if len(data) != expectedSize {
t.Errorf("Got %v Expected %v\n", len(data), expectedSize)
}
res := search(data, []byte("good"), -1)
if len(res) != expectedMatches {
t.Errorf("Got %v Expected %v\n", len(res), expectedMatches)
}
}
func BenchmarkSearch(b *testing.B) {
testFilePath := "testdata/moby.txt"
pattern := []byte("good")
data, err := ioutil.ReadFile(testFilePath)
if err != nil {
b.Fatal(err)
}
b.ResetTimer()
for n := 0; n < b.N; n++ {
search(data, pattern, -1)
}
}