github.com/1aal/kubeblocks@v0.0.0-20231107070852-e1c03e598921/pkg/cli/testing/printer.go (about)

     1  /*
     2  Copyright (C) 2022-2023 ApeCloud Co., Ltd
     3  
     4  This file is part of KubeBlocks project
     5  
     6  This program is free software: you can redistribute it and/or modify
     7  it under the terms of the GNU Affero General Public License as published by
     8  the Free Software Foundation, either version 3 of the License, or
     9  (at your option) any later version.
    10  
    11  This program is distributed in the hope that it will be useful
    12  but WITHOUT ANY WARRANTY; without even the implied warranty of
    13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14  GNU Affero General Public License for more details.
    15  
    16  You should have received a copy of the GNU Affero General Public License
    17  along with this program.  If not, see <http://www.gnu.org/licenses/>.
    18  */
    19  
    20  package testing
    21  
    22  import (
    23  	"io"
    24  	"os"
    25  	"strings"
    26  )
    27  
    28  // Capture replaces os.Stdout with a writer that buffers any data written
    29  // to os.Stdout. Call the returned function to clean up and return the data
    30  // as a string.
    31  func Capture() func() (string, error) {
    32  	r, w, err := os.Pipe()
    33  	if err != nil {
    34  		panic(err)
    35  	}
    36  
    37  	done := make(chan error, 1)
    38  
    39  	save := os.Stdout
    40  	os.Stdout = w
    41  
    42  	var buf strings.Builder
    43  
    44  	go func() {
    45  		_, err := io.Copy(&buf, r)
    46  		r.Close()
    47  		done <- err
    48  	}()
    49  
    50  	return func() (string, error) {
    51  		os.Stdout = save
    52  		w.Close()
    53  		err := <-done
    54  		return buf.String(), err
    55  	}
    56  }
    57  
    58  // ContainExpectStrings checks if the specific string contains the expected strings.
    59  func ContainExpectStrings(out string, expectStrings ...string) bool {
    60  	for i := range expectStrings {
    61  		if !strings.Contains(out, expectStrings[i]) {
    62  			return false
    63  		}
    64  	}
    65  	return true
    66  }