github.com/Mirantis/virtlet@v1.5.2-0.20191204181327-1659b8a48e9b/tests/gm/git_test.go (about)

     1  /*
     2  Copyright 2017 Mirantis
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package gm
    18  
    19  import (
    20  	"io/ioutil"
    21  	"os"
    22  	"os/exec"
    23  	"path/filepath"
    24  	"strings"
    25  	"testing"
    26  )
    27  
    28  const (
    29  	gitSetupCmd = `
    30  git config --global user.email 'foo@example.com' &&
    31  git config --global user.name 'foo' &&
    32  git init &&
    33  git add . &&
    34  git commit -m 'ok'`
    35  )
    36  
    37  func TestGitDiff(t *testing.T) {
    38  	tmpDir, err := ioutil.TempDir("", "git-test")
    39  	if err != nil {
    40  		t.Fatalf("TempDir(): %v", err)
    41  	}
    42  	defer os.RemoveAll(tmpDir)
    43  	oldHome := os.Getenv("HOME")
    44  	os.Setenv("HOME", tmpDir)
    45  	defer os.Setenv("HOME", oldHome)
    46  
    47  	origWd, err := os.Getwd()
    48  	if err != nil {
    49  		t.Fatalf("os.Getwd(): %v", err)
    50  	}
    51  	defer os.Chdir(origWd)
    52  	if err := os.Chdir(tmpDir); err != nil {
    53  		t.Fatalf("os.Chdir(): %v", err)
    54  	}
    55  	if err := ioutil.WriteFile("samplefile", []byte("foobar"), 0777); err != nil {
    56  		t.Fatalf("ioutil.WriteFile(): %v", err)
    57  	}
    58  
    59  	out, err := exec.Command("/bin/sh", "-c", gitSetupCmd).CombinedOutput()
    60  	if err != nil {
    61  		t.Fatalf("git init failed: %v:\n%s", err, out)
    62  	}
    63  
    64  	diffOut, err := GitDiff(filepath.Join(tmpDir, "samplefile"))
    65  	switch {
    66  	case err != nil:
    67  		t.Errorf("GitDiff (unchanged): %v", err)
    68  	case diffOut != "":
    69  		t.Errorf("GitDiff (unchanged): unexpected diff:\n%s", diffOut)
    70  	}
    71  
    72  	if err := ioutil.WriteFile("samplefile", []byte("baz"), 0777); err != nil {
    73  		t.Fatalf("ioutil.WriteFile(): %v", err)
    74  	}
    75  
    76  	diffOut, err = GitDiff(filepath.Join(tmpDir, "samplefile"))
    77  	switch {
    78  	case err != nil:
    79  		t.Errorf("GitDiff (changed): %v", err)
    80  	case diffOut == "":
    81  		t.Errorf("GitDiff (changed): no diff")
    82  	case !strings.Contains(diffOut, "-foobar") || !strings.Contains(diffOut, "+baz"):
    83  		t.Errorf("GitDiff (changed): bad diff output:\n%s", diffOut)
    84  	}
    85  
    86  	out, err = exec.Command("git", "add", "samplefile").CombinedOutput()
    87  	if err != nil {
    88  		t.Fatalf("git add failed: %v:\n%s", err, out)
    89  	}
    90  
    91  	diffOut, err = GitDiff(filepath.Join(tmpDir, "samplefile"))
    92  	switch {
    93  	case err != nil:
    94  		t.Errorf("GitDiff (staged): %v", err)
    95  	case diffOut != "":
    96  		t.Errorf("GitDiff (staged): unexpected diff:\n%s", diffOut)
    97  	}
    98  
    99  	diffOut, err = GitDiff(filepath.Join(tmpDir, "samplefile"))
   100  	switch {
   101  	case err != nil:
   102  		t.Errorf("GitDiff (staged, other work dir): %v", err)
   103  	case diffOut != "":
   104  		t.Errorf("GitDiff (staged, other work dir): unexpected diff:\n%s", diffOut)
   105  	}
   106  
   107  	if err := ioutil.WriteFile("newfile", []byte("newcontent"), 0777); err != nil {
   108  		t.Fatalf("ioutil.WriteFile(): %v", err)
   109  	}
   110  
   111  	diffOut, err = GitDiff(filepath.Join(tmpDir, "newfile"))
   112  	switch {
   113  	case err != nil:
   114  		t.Errorf("GitDiff (new): %v", err)
   115  	case diffOut == "":
   116  		t.Errorf("GitDiff (new): no diff")
   117  	case !strings.Contains(diffOut, "<NEW FILE>") || !strings.Contains(diffOut, "newcontent"):
   118  		t.Errorf("GitDiff (new): bad diff output:\n%s", diffOut)
   119  	}
   120  }