t/t4065-diff-anchored.sh

   1 #!/bin/sh
   2
   3 test_description='anchored diff algorithm'
   4
   5 . ./test-lib.sh
   6
   7 test_expect_success '--anchored' '
   8         printf "a\nb\nc\n" >pre &&
   9         printf "c\na\nb\n" >post &&
  10
  11         # normally, c is moved to produce the smallest diff
  12         test_expect_code 1 git diff --no-index pre post >diff &&
  13         grep "^+c" diff &&
  14
  15         # with anchor, a is moved
  16         test_expect_code 1 git diff --no-index --anchored=c pre post >diff &&
  17         grep "^+a" diff
  18 '
  19
  20 test_expect_success '--anchored multiple' '
  21         printf "a\nb\nc\nd\ne\nf\n" >pre &&
  22         printf "c\na\nb\nf\nd\ne\n" >post &&
  23
  24         # with 1 anchor, c is not moved, but f is moved
  25         test_expect_code 1 git diff --no-index --anchored=c pre post >diff &&
  26         grep "^+a" diff && # a is moved instead of c
  27         grep "^+f" diff &&
  28
  29         # with 2 anchors, c and f are not moved
  30         test_expect_code 1 git diff --no-index --anchored=c --anchored=f pre post >diff &&
  31         grep "^+a" diff &&
  32         grep "^+d" diff # d is moved instead of f
  33 '
  34
  35 test_expect_success '--anchored with nonexistent line has no effect' '
  36         printf "a\nb\nc\n" >pre &&
  37         printf "c\na\nb\n" >post &&
  38
  39         test_expect_code 1 git diff --no-index --anchored=x pre post >diff &&
  40         grep "^+c" diff
  41 '
  42
  43 test_expect_success '--anchored with non-unique line has no effect' '
  44         printf "a\nb\nc\nd\ne\nc\n" >pre &&
  45         printf "c\na\nb\nc\nd\ne\n" >post &&
  46
  47         test_expect_code 1 git diff --no-index --anchored=c pre post >diff &&
  48         grep "^+c" diff
  49 '
  50
  51 test_expect_success 'diff still produced with impossible multiple --anchored' '
  52         printf "a\nb\nc\n" >pre &&
  53         printf "c\na\nb\n" >post &&
  54
  55         test_expect_code 1 git diff --no-index --anchored=a --anchored=c pre post >diff &&
  56         mv post expected_post &&
  57
  58         # Ensure that the diff is correct by applying it and then
  59         # comparing the result with the original
  60         git apply diff &&
  61         diff expected_post post
  62 '
  63
  64 test_expect_success 'later algorithm arguments override earlier ones' '
  65         printf "a\nb\nc\n" >pre &&
  66         printf "c\na\nb\n" >post &&
  67
  68         test_expect_code 1 git diff --no-index --patience --anchored=c pre post >diff &&
  69         grep "^+a" diff &&
  70
  71         test_expect_code 1 git diff --no-index --anchored=c --patience pre post >diff &&
  72         grep "^+c" diff &&
  73
  74         test_expect_code 1 git diff --no-index --histogram --anchored=c pre post >diff &&
  75         grep "^+a" diff &&
  76
  77         test_expect_code 1 git diff --no-index --anchored=c --histogram pre post >diff &&
  78         grep "^+c" diff
  79 '
  80
  81 test_expect_success '--anchored works with other commands like "git show"' '
  82         printf "a\nb\nc\n" >file &&
  83         git add file &&
  84         git commit -m foo &&
  85         printf "c\na\nb\n" >file &&
  86         git add file &&
  87         git commit -m foo &&
  88
  89         # with anchor, a is moved
  90         git show --patience --anchored=c >diff &&
  91         grep "^+a" diff
  92 '
  93
  94 test_done