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-rwxr-xr-xt/t5309-pack-delta-cycles.sh77
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diff --git a/t/t5309-pack-delta-cycles.sh b/t/t5309-pack-delta-cycles.sh
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+++ b/t/t5309-pack-delta-cycles.sh
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+#!/bin/sh
+
+test_description='test index-pack handling of delta cycles in packfiles'
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-pack.sh
+
+# Two similar-ish objects that we have computed deltas between.
+A=01d7713666f4de822776c7622c10f1b07de280dc
+B=e68fe8129b546b101aee9510c5328e7f21ca1d18
+
+# double-check our hand-constucted packs
+test_expect_success 'index-pack works with a single delta (A->B)' '
+ clear_packs &&
+ {
+ pack_header 2 &&
+ pack_obj $A $B &&
+ pack_obj $B
+ } >ab.pack &&
+ pack_trailer ab.pack &&
+ git index-pack --stdin <ab.pack &&
+ git cat-file -t $A &&
+ git cat-file -t $B
+'
+
+test_expect_success 'index-pack works with a single delta (B->A)' '
+ clear_packs &&
+ {
+ pack_header 2 &&
+ pack_obj $A &&
+ pack_obj $B $A
+ } >ba.pack &&
+ pack_trailer ba.pack &&
+ git index-pack --stdin <ba.pack &&
+ git cat-file -t $A &&
+ git cat-file -t $B
+'
+
+test_expect_success 'index-pack detects missing base objects' '
+ clear_packs &&
+ {
+ pack_header 1 &&
+ pack_obj $A $B
+ } >missing.pack &&
+ pack_trailer missing.pack &&
+ test_must_fail git index-pack --fix-thin --stdin <missing.pack
+'
+
+test_expect_success 'index-pack detects REF_DELTA cycles' '
+ clear_packs &&
+ {
+ pack_header 2 &&
+ pack_obj $A $B &&
+ pack_obj $B $A
+ } >cycle.pack &&
+ pack_trailer cycle.pack &&
+ test_must_fail git index-pack --fix-thin --stdin <cycle.pack
+'
+
+test_expect_failure 'failover to an object in another pack' '
+ clear_packs &&
+ git index-pack --stdin <ab.pack &&
+ git index-pack --stdin --fix-thin <cycle.pack
+'
+
+test_expect_failure 'failover to a duplicate object in the same pack' '
+ clear_packs &&
+ {
+ pack_header 3 &&
+ pack_obj $A $B &&
+ pack_obj $B $A &&
+ pack_obj $A
+ } >recoverable.pack &&
+ pack_trailer recoverable.pack &&
+ git index-pack --fix-thin --stdin <recoverable.pack
+'
+
+test_done