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-rwxr-xr-xt/t8011-blame-split-file.sh117
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+#!/bin/sh
+
+test_description='
+The general idea is that we have a single file whose lines come from
+multiple other files, and those individual files were modified in the same
+commits. That means that we will see the same commit in multiple contexts,
+and each one should be attributed to the correct file.
+
+Note that we need to use "blame -C" to find the commit for all lines. We will
+not bother testing that the non-C case fails to find it. That is how blame
+behaves now, but it is not a property we want to make sure is retained.
+'
+. ./test-lib.sh
+
+# help avoid typing and reading long strings of similar lines
+# in the tests below
+generate_expect () {
+ while read nr data
+ do
+ i=0
+ while test $i -lt $nr
+ do
+ echo $data
+ i=$((i + 1))
+ done
+ done
+}
+
+test_expect_success 'setup split file case' '
+ # use lines long enough to trigger content detection
+ test_seq 1000 1010 >one &&
+ test_seq 2000 2010 >two &&
+ git add one two &&
+ test_commit base &&
+
+ sed "6s/^/modified /" <one >one.tmp &&
+ mv one.tmp one &&
+ sed "6s/^/modified /" <two >two.tmp &&
+ mv two.tmp two &&
+ git add -u &&
+ test_commit modified &&
+
+ cat one two >combined &&
+ git add combined &&
+ git rm one two &&
+ test_commit combined
+'
+
+test_expect_success 'setup simulated porcelain' '
+ # This just reads porcelain-ish output and tries
+ # to output the value of a given field for each line (either by
+ # reading the field that accompanies this line, or referencing
+ # the information found last time the commit was mentioned).
+ cat >read-porcelain.pl <<-\EOF
+ my $field = shift;
+ while (<>) {
+ if (/^[0-9a-f]{40,} /) {
+ flush();
+ $hash = $&;
+ } elsif (/^$field (.*)/) {
+ $cache{$hash} = $1;
+ }
+ }
+ flush();
+
+ sub flush {
+ return unless defined $hash;
+ if (defined $cache{$hash}) {
+ print "$cache{$hash}\n";
+ } else {
+ print "NONE\n";
+ }
+ }
+ EOF
+'
+
+for output in porcelain line-porcelain
+do
+ test_expect_success "generate --$output output" '
+ git blame --root -C --$output combined >output
+ '
+
+ test_expect_success "$output output finds correct commits" '
+ generate_expect >expect <<-\EOF &&
+ 5 base
+ 1 modified
+ 10 base
+ 1 modified
+ 5 base
+ EOF
+ perl read-porcelain.pl summary <output >actual &&
+ test_cmp expect actual
+ '
+
+ test_expect_success "$output output shows correct filenames" '
+ generate_expect >expect <<-\EOF &&
+ 11 one
+ 11 two
+ EOF
+ perl read-porcelain.pl filename <output >actual &&
+ test_cmp expect actual
+ '
+
+ test_expect_success "$output output shows correct previous pointer" '
+ generate_expect >expect <<-EOF &&
+ 5 NONE
+ 1 $(git rev-parse modified^) one
+ 10 NONE
+ 1 $(git rev-parse modified^) two
+ 5 NONE
+ EOF
+ perl read-porcelain.pl previous <output >actual &&
+ test_cmp expect actual
+ '
+done
+
+test_done