[PATCH 11/16] test-reach: test get_merge_bases_many

[Derrick Stolee via GitGitGadget]

From: Derrick Stolee <dsto...@microsoft.com>

The get_merge_bases_many method returns a list of merge bases for a
single commit (A) against a list of commits (X). Some care is needed in
constructing the expected behavior because the result is not the
expected merge-base for an octopus merge with those parents but instead
the set of maximal commits that are reachable from A and at least one of
the commits in X.

Add get_merge_bases_many to 'test-tool reach' and create a test that
demonstrates that this output returns multiple results. Specifically, we
select a list of three commits such that we output two commits that are
reachable from one of the first two, respectively, and none are
reachable from the third.

Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
 t/helper/test-reach.c | 15 +++++++++++++++
 t/t6600-test-reach.sh | 15 +++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/t/helper/test-reach.c b/t/helper/test-reach.c
index 149e8f32c..97c726040 100644
--- a/t/helper/test-reach.c
+++ b/t/helper/test-reach.c
@@ -10,6 +10,8 @@ int cmd__reach(int ac, const char **av)
        struct object_id oid_A, oid_B;
        struct commit *A, *B;
        struct commit_list *X;
+       struct commit **X_array;
+       int X_nr, X_alloc;
        struct strbuf buf = STRBUF_INIT;
        struct repository *r = the_repository;
 
@@ -20,6 +22,9 @@ int cmd__reach(int ac, const char **av)
 
        A = B = NULL;
        X = NULL;
+       X_nr = 0;
+       X_alloc = 16;
+       ALLOC_ARRAY(X_array, X_alloc);
 
        while (strbuf_getline(&buf, stdin) != EOF) {
                struct object_id oid;
@@ -57,6 +62,8 @@ int cmd__reach(int ac, const char **av)
 
                        case 'X':
                                commit_list_insert(c, &X);
+                               ALLOC_GROW(X_array, X_nr + 1, X_alloc);
+                               X_array[X_nr++] = c;
                                break;
 
                        default:
@@ -71,6 +78,14 @@ int cmd__reach(int ac, const char **av)
                printf("%s(A,B):%d\n", av[1], in_merge_bases(A, B));
        else if (!strcmp(av[1], "is_descendant_of"))
                printf("%s(A,X):%d\n", av[1], is_descendant_of(A, X));
+       else if (!strcmp(av[1], "get_merge_bases_many")) {
+               struct commit_list *list = get_merge_bases_many(A, X_nr, 
X_array);
+               printf("%s(A,X):\n", av[1]);
+               while (list) {
+                       printf("%s\n", oid_to_hex(&list->item->object.oid));
+                       list = list->next;
+               }
+       }
 
        exit(0);
 }
diff --git a/t/t6600-test-reach.sh b/t/t6600-test-reach.sh
index 99444e0f7..19e39ad7c 100755
--- a/t/t6600-test-reach.sh
+++ b/t/t6600-test-reach.sh
@@ -123,4 +123,19 @@ test_expect_success 'is_descendant_of:miss' '
        test_three_modes is_descendant_of
 '
 
+test_expect_success 'get_merge_bases_many' '
+       cat >input <<-\EOF &&
+               A:commit-5-7
+               X:commit-4-8
+               X:commit-6-6
+               X:commit-8-3
+       EOF
+       {
+               printf "get_merge_bases_many(A,X):\n" &&
+               git rev-parse commit-5-6 &&
+               git rev-parse commit-4-7
+       } >expect &&
+       test_three_modes get_merge_bases_many
+'
+
 test_done
-- 
gitgitgadget