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-rwxr-xr-xt/t4068-diff-symmetric-merge-base.sh196
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diff --git a/t/t4068-diff-symmetric-merge-base.sh b/t/t4068-diff-symmetric-merge-base.sh
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+#!/bin/sh
+
+test_description='behavior of diff with symmetric-diff setups and --merge-base'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+# build these situations:
+# - normal merge with one merge base (br1...b2r);
+# - criss-cross merge ie 2 merge bases (br1...main);
+# - disjoint subgraph (orphan branch, br3...main).
+#
+# B---E <-- main
+# / \ /
+# A X
+# \ / \
+# C---D--G <-- br1
+# \ /
+# ---F <-- br2
+#
+# H <-- br3
+#
+# We put files into a few commits so that we can verify the
+# output as well.
+
+test_expect_success setup '
+ git commit --allow-empty -m A &&
+ echo b >b &&
+ git add b &&
+ git commit -m B &&
+ git checkout -b br1 HEAD^ &&
+ echo c >c &&
+ git add c &&
+ git commit -m C &&
+ git tag commit-C &&
+ git merge -m D main &&
+ git tag commit-D &&
+ git checkout main &&
+ git merge -m E commit-C &&
+ git checkout -b br2 commit-C &&
+ echo f >f &&
+ git add f &&
+ git commit -m F &&
+ git checkout br1 &&
+ git merge -m G br2 &&
+ git checkout --orphan br3 &&
+ git commit -m H
+'
+
+test_expect_success 'diff with one merge base' '
+ git diff commit-D...br1 >tmp &&
+ tail -n 1 tmp >actual &&
+ echo +f >expect &&
+ test_cmp expect actual
+'
+
+# The output (in tmp) can have +b or +c depending
+# on which merge base (commit B or C) is picked.
+# It should have one of those two, which comes out
+# to seven lines.
+test_expect_success 'diff with two merge bases' '
+ git diff br1...main >tmp 2>err &&
+ test_line_count = 7 tmp &&
+ test_line_count = 1 err
+'
+
+test_expect_success 'diff with no merge bases' '
+ test_must_fail git diff br2...br3 2>err &&
+ test_i18ngrep "fatal: br2...br3: no merge base" err
+'
+
+test_expect_success 'diff with too many symmetric differences' '
+ test_must_fail git diff br1...main br2...br3 2>err &&
+ test_i18ngrep "usage" err
+'
+
+test_expect_success 'diff with symmetric difference and extraneous arg' '
+ test_must_fail git diff main br1...main 2>err &&
+ test_i18ngrep "usage" err
+'
+
+test_expect_success 'diff with two ranges' '
+ test_must_fail git diff main br1..main br2..br3 2>err &&
+ test_i18ngrep "usage" err
+'
+
+test_expect_success 'diff with ranges and extra arg' '
+ test_must_fail git diff main br1..main commit-D 2>err &&
+ test_i18ngrep "usage" err
+'
+
+test_expect_success 'diff --merge-base with no commits' '
+ test_must_fail git diff --merge-base
+'
+
+test_expect_success 'diff --merge-base with three commits' '
+ test_must_fail git diff --merge-base br1 br2 main 2>err &&
+ test_i18ngrep "usage" err
+'
+
+for cmd in diff-index diff
+do
+ test_expect_success "$cmd --merge-base with one commit" '
+ git checkout main &&
+ git $cmd commit-C >expect &&
+ git $cmd --merge-base br2 >actual &&
+ test_cmp expect actual
+ '
+
+ test_expect_success "$cmd --merge-base with one commit and unstaged changes" '
+ git checkout main &&
+ test_when_finished git reset --hard &&
+ echo unstaged >>c &&
+ git $cmd commit-C >expect &&
+ git $cmd --merge-base br2 >actual &&
+ test_cmp expect actual
+ '
+
+ test_expect_success "$cmd --merge-base with one commit and staged and unstaged changes" '
+ git checkout main &&
+ test_when_finished git reset --hard &&
+ echo staged >>c &&
+ git add c &&
+ echo unstaged >>c &&
+ git $cmd commit-C >expect &&
+ git $cmd --merge-base br2 >actual &&
+ test_cmp expect actual
+ '
+
+ test_expect_success "$cmd --merge-base --cached with one commit and staged and unstaged changes" '
+ git checkout main &&
+ test_when_finished git reset --hard &&
+ echo staged >>c &&
+ git add c &&
+ echo unstaged >>c &&
+ git $cmd --cached commit-C >expect &&
+ git $cmd --cached --merge-base br2 >actual &&
+ test_cmp expect actual
+ '
+
+ test_expect_success "$cmd --merge-base with non-commit" '
+ git checkout main &&
+ test_must_fail git $cmd --merge-base main^{tree} 2>err &&
+ test_i18ngrep "fatal: --merge-base only works with commits" err
+ '
+
+ test_expect_success "$cmd --merge-base with no merge bases and one commit" '
+ git checkout main &&
+ test_must_fail git $cmd --merge-base br3 2>err &&
+ test_i18ngrep "fatal: no merge base found" err
+ '
+
+ test_expect_success "$cmd --merge-base with multiple merge bases and one commit" '
+ git checkout main &&
+ test_must_fail git $cmd --merge-base br1 2>err &&
+ test_i18ngrep "fatal: multiple merge bases found" err
+ '
+done
+
+for cmd in diff-tree diff
+do
+ test_expect_success "$cmd --merge-base with two commits" '
+ git $cmd commit-C main >expect &&
+ git $cmd --merge-base br2 main >actual &&
+ test_cmp expect actual
+ '
+
+ test_expect_success "$cmd --merge-base commit and non-commit" '
+ test_must_fail git $cmd --merge-base br2 main^{tree} 2>err &&
+ test_i18ngrep "fatal: --merge-base only works with commits" err
+ '
+
+ test_expect_success "$cmd --merge-base with no merge bases and two commits" '
+ test_must_fail git $cmd --merge-base br2 br3 2>err &&
+ test_i18ngrep "fatal: no merge base found" err
+ '
+
+ test_expect_success "$cmd --merge-base with multiple merge bases and two commits" '
+ test_must_fail git $cmd --merge-base main br1 2>err &&
+ test_i18ngrep "fatal: multiple merge bases found" err
+ '
+done
+
+test_expect_success 'diff-tree --merge-base with one commit' '
+ test_must_fail git diff-tree --merge-base main 2>err &&
+ test_i18ngrep "fatal: --merge-base only works with two commits" err
+'
+
+test_expect_success 'diff --merge-base with range' '
+ test_must_fail git diff --merge-base br2..br3 2>err &&
+ test_i18ngrep "fatal: --merge-base does not work with ranges" err
+'
+
+test_done