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-rwxr-xr-xt/t4063-diff-blobs.sh96
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+#!/bin/sh
+
+test_description='test direct comparison of blobs via git-diff'
+. ./test-lib.sh
+
+run_diff () {
+ # use full-index to make it easy to match the index line
+ git diff --full-index "$@" >diff
+}
+
+check_index () {
+ grep "^index $1\\.\\.$2" diff
+}
+
+check_mode () {
+ grep "^old mode $1" diff &&
+ grep "^new mode $2" diff
+}
+
+check_paths () {
+ grep "^diff --git a/$1 b/$2" diff
+}
+
+test_expect_success 'create some blobs' '
+ echo one >one &&
+ echo two >two &&
+ chmod +x two &&
+ git add . &&
+
+ # cover systems where modes are ignored
+ git update-index --chmod=+x two &&
+
+ git commit -m base &&
+
+ sha1_one=$(git rev-parse HEAD:one) &&
+ sha1_two=$(git rev-parse HEAD:two)
+'
+
+test_expect_success 'diff by sha1' '
+ run_diff $sha1_one $sha1_two
+'
+test_expect_success 'index of sha1 diff' '
+ check_index $sha1_one $sha1_two
+'
+test_expect_success 'sha1 diff uses arguments as paths' '
+ check_paths $sha1_one $sha1_two
+'
+test_expect_success 'sha1 diff has no mode change' '
+ ! grep mode diff
+'
+
+test_expect_success 'diff by tree:path (run)' '
+ run_diff HEAD:one HEAD:two
+'
+test_expect_success 'index of tree:path diff' '
+ check_index $sha1_one $sha1_two
+'
+test_expect_success 'tree:path diff uses filenames as paths' '
+ check_paths one two
+'
+test_expect_success 'tree:path diff shows mode change' '
+ check_mode 100644 100755
+'
+
+test_expect_success 'diff by ranged tree:path' '
+ run_diff HEAD:one..HEAD:two
+'
+test_expect_success 'index of ranged tree:path diff' '
+ check_index $sha1_one $sha1_two
+'
+test_expect_success 'ranged tree:path diff uses filenames as paths' '
+ check_paths one two
+'
+test_expect_success 'ranged tree:path diff shows mode change' '
+ check_mode 100644 100755
+'
+
+test_expect_success 'diff blob against file' '
+ run_diff HEAD:one two
+'
+test_expect_success 'index of blob-file diff' '
+ check_index $sha1_one $sha1_two
+'
+test_expect_success 'blob-file diff uses filename as paths' '
+ check_paths one two
+'
+test_expect_success FILEMODE 'blob-file diff shows mode change' '
+ check_mode 100644 100755
+'
+
+test_expect_success 'blob-file diff prefers filename to sha1' '
+ run_diff $sha1_one two &&
+ check_paths two two
+'
+
+test_done