1 files changed, 196 insertions, 0 deletions
diff --git a/src/io/ioutil/tempfile_test.go b/src/io/ioutil/tempfile_test.go
new file mode 100644
index 0000000..5cef18c
--- /dev/null
+++ b/src/io/ioutil/tempfile_test.go
@@ -0,0 +1,196 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ioutil_test
+
+import (
+	"io/fs"
+	. "io/ioutil"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"testing"
+)
+
+func TestTempFile(t *testing.T) {
+	dir, err := TempDir("", "TestTempFile_BadDir")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dir)
+
+	nonexistentDir := filepath.Join(dir, "_not_exists_")
+	f, err := TempFile(nonexistentDir, "foo")
+	if f != nil || err == nil {
+		t.Errorf("TempFile(%q, `foo`) = %v, %v", nonexistentDir, f, err)
+	}
+}
+
+func TestTempFile_pattern(t *testing.T) {
+	tests := []struct{ pattern, prefix, suffix string }{
+		{"ioutil_test", "ioutil_test", ""},
+		{"ioutil_test*", "ioutil_test", ""},
+		{"ioutil_test*xyz", "ioutil_test", "xyz"},
+	}
+	for _, test := range tests {
+		f, err := TempFile("", test.pattern)
+		if err != nil {
+			t.Errorf("TempFile(..., %q) error: %v", test.pattern, err)
+			continue
+		}
+		defer os.Remove(f.Name())
+		base := filepath.Base(f.Name())
+		f.Close()
+		if !(strings.HasPrefix(base, test.prefix) && strings.HasSuffix(base, test.suffix)) {
+			t.Errorf("TempFile pattern %q created bad name %q; want prefix %q & suffix %q",
+				test.pattern, base, test.prefix, test.suffix)
+		}
+	}
+}
+
+// This string is from os.errPatternHasSeparator.
+const patternHasSeparator = "pattern contains path separator"
+
+func TestTempFile_BadPattern(t *testing.T) {
+	tmpDir, err := TempDir("", t.Name())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	const sep = string(os.PathSeparator)
+	tests := []struct {
+		pattern string
+		wantErr bool
+	}{
+		{"ioutil*test", false},
+		{"ioutil_test*foo", false},
+		{"ioutil_test" + sep + "foo", true},
+		{"ioutil_test*" + sep + "foo", true},
+		{"ioutil_test" + sep + "*foo", true},
+		{sep + "ioutil_test" + sep + "*foo", true},
+		{"ioutil_test*foo" + sep, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.pattern, func(t *testing.T) {
+			tmpfile, err := TempFile(tmpDir, tt.pattern)
+			defer func() {
+				if tmpfile != nil {
+					tmpfile.Close()
+				}
+			}()
+			if tt.wantErr {
+				if err == nil {
+					t.Errorf("Expected an error for pattern %q", tt.pattern)
+				} else if !strings.Contains(err.Error(), patternHasSeparator) {
+					t.Errorf("Error mismatch: got %#v, want %q for pattern %q", err, patternHasSeparator, tt.pattern)
+				}
+			} else if err != nil {
+				t.Errorf("Unexpected error %v for pattern %q", err, tt.pattern)
+			}
+		})
+	}
+}
+
+func TestTempDir(t *testing.T) {
+	name, err := TempDir("/_not_exists_", "foo")
+	if name != "" || err == nil {
+		t.Errorf("TempDir(`/_not_exists_`, `foo`) = %v, %v", name, err)
+	}
+
+	tests := []struct {
+		pattern                string
+		wantPrefix, wantSuffix string
+	}{
+		{"ioutil_test", "ioutil_test", ""},
+		{"ioutil_test*", "ioutil_test", ""},
+		{"ioutil_test*xyz", "ioutil_test", "xyz"},
+	}
+
+	dir := os.TempDir()
+
+	runTestTempDir := func(t *testing.T, pattern, wantRePat string) {
+		name, err := TempDir(dir, pattern)
+		if name == "" || err != nil {
+			t.Fatalf("TempDir(dir, `ioutil_test`) = %v, %v", name, err)
+		}
+		defer os.Remove(name)
+
+		re := regexp.MustCompile(wantRePat)
+		if !re.MatchString(name) {
+			t.Errorf("TempDir(%q, %q) created bad name\n\t%q\ndid not match pattern\n\t%q", dir, pattern, name, wantRePat)
+		}
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.pattern, func(t *testing.T) {
+			wantRePat := "^" + regexp.QuoteMeta(filepath.Join(dir, tt.wantPrefix)) + "[0-9]+" + regexp.QuoteMeta(tt.wantSuffix) + "$"
+			runTestTempDir(t, tt.pattern, wantRePat)
+		})
+	}
+
+	// Separately testing "*xyz" (which has no prefix). That is when constructing the
+	// pattern to assert on, as in the previous loop, using filepath.Join for an empty
+	// prefix filepath.Join(dir, ""), produces the pattern:
+	//     ^<DIR>[0-9]+xyz$
+	// yet we just want to match
+	//     "^<DIR>/[0-9]+xyz"
+	t.Run("*xyz", func(t *testing.T) {
+		wantRePat := "^" + regexp.QuoteMeta(filepath.Join(dir)) + regexp.QuoteMeta(string(filepath.Separator)) + "[0-9]+xyz$"
+		runTestTempDir(t, "*xyz", wantRePat)
+	})
+}
+
+// test that we return a nice error message if the dir argument to TempDir doesn't
+// exist (or that it's empty and os.TempDir doesn't exist)
+func TestTempDir_BadDir(t *testing.T) {
+	dir, err := TempDir("", "TestTempDir_BadDir")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dir)
+
+	badDir := filepath.Join(dir, "not-exist")
+	_, err = TempDir(badDir, "foo")
+	if pe, ok := err.(*fs.PathError); !ok || !os.IsNotExist(err) || pe.Path != badDir {
+		t.Errorf("TempDir error = %#v; want PathError for path %q satisifying os.IsNotExist", err, badDir)
+	}
+}
+
+func TestTempDir_BadPattern(t *testing.T) {
+	tmpDir, err := TempDir("", t.Name())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	const sep = string(os.PathSeparator)
+	tests := []struct {
+		pattern string
+		wantErr bool
+	}{
+		{"ioutil*test", false},
+		{"ioutil_test*foo", false},
+		{"ioutil_test" + sep + "foo", true},
+		{"ioutil_test*" + sep + "foo", true},
+		{"ioutil_test" + sep + "*foo", true},
+		{sep + "ioutil_test" + sep + "*foo", true},
+		{"ioutil_test*foo" + sep, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.pattern, func(t *testing.T) {
+			_, err := TempDir(tmpDir, tt.pattern)
+			if tt.wantErr {
+				if err == nil {
+					t.Errorf("Expected an error for pattern %q", tt.pattern)
+				} else if !strings.Contains(err.Error(), patternHasSeparator) {
+					t.Errorf("Error mismatch: got %#v, want %q for pattern %q", err, patternHasSeparator, tt.pattern)
+				}
+			} else if err != nil {
+				t.Errorf("Unexpected error %v for pattern %q", err, tt.pattern)
+			}
+		})
+	}
+}