Add e2e test for [reorder, amend]

e2e/evolve/combinations/reorder_then_amend.txt

@@ -0,0 +1,107 @@
+# Evolve resolves commit graph after reorder + amend downstream
+# =============================================================
+
+# --- SETUP ---
+
+# Add directory with `git` executable to PATH
+env PATH=$PATH${:}/usr/bin/
+
+# Specify commit timestamp so commit hashes are fixed.
+env GIT_COMMITTER_DATE='01 Jan 2023 00:00:00 UTC'
+
+# Specify the test interactive sequence editor program (used in `git rebase -i`).
+env GIT_SEQUENCE_EDITOR='seq_editor'
+
+# The test interactive editor should paste the instructions in `SEQ_EDITOR_INPUT`
+# into Git's instruction sheet.
+env SEQ_EDITOR_INPUT='.git/tree/rebase-instructs'
+
+# Setup the Git repository
+exec git init
+exec git config user.email "[email protected]"
+exec git config user.name "Test"
+exec write_file README.txt readme
+exec git add .
+exec git commit -m 'initial commit' --date $GIT_COMMITTER_DATE
+
+# BUG: This commit is needed to prevent a nil pointer dereference (getting the
+# parent of an initial commit). Fix the algorithm and remove this extra commit.
+exec write_file dummy.txt dummy
+exec git add .
+exec git commit -m 'Add dummy.txt' --date $GIT_COMMITTER_DATE
+
+
+# Initial:
+#
+#  [master] ─── (grovyle) ─── (treecko) ─── [sceptile] ─── [turtwig]
+#
+# Action:
+#  1. Reorder commits in [sceptile]
+#  2. Amend [turtwig]
+#
+# Result:
+#  [master] ─── (treecko) ─── (grovyle) ─── [sceptile] ─── [turtwig]
+
+# Add commits to sceptile branch
+exec git checkout -b sceptile
+
+exec write_file grovyle.txt grovyle
+exec git add .
+exec git commit -m 'Add grovyle.txt' --date $GIT_COMMITTER_DATE
+
+exec write_file treecko.txt treecko
+exec git add .
+exec git commit -m 'Add treecko.txt' --date $GIT_COMMITTER_DATE
+
+exec write_file sceptile.txt sceptile
+exec git add .
+exec git commit -m 'Add sceptile.txt' --date $GIT_COMMITTER_DATE
+
+
+# Add commits to turtwig branch
+exec git checkout -b turtwig
+
+exec write_file turtwig.txt turtwig
+exec git add .
+exec git commit -m 'Add turtwig.txt' --date $GIT_COMMITTER_DATE
+
+
+# Initialize git-tree
+exec git-tree init
+
+# Reorder the commits in the graph.
+exec git checkout sceptile
+exec git rebase -i HEAD~3
+
+
+# Amend a downstream commit
+exec git checkout turtwig
+exec git commit --amend -m 'Amend turtwig.txt' --date $GIT_COMMITTER_DATE
+
+
+# --- TEST ---
+
+# Run evolve
+exec git-tree evolve
+
+# BUG: The old commit still exists in the repository, since it's pointed to by
+# branch `git-tree-root`. Fix `git-tree-root` target instead of dropping git-tree.
+exec git-tree drop
+
+# Compare the git log
+exec git log --oneline --graph --all --decorate
+cp stdout .git/actual-log
+exec compare .git/actual-log .git/golden-log
+
+
+-- .git/tree/rebase-instructs --
+pick 5f510c1 Add treecko.txt
+pick 9793ef5 Add grovyle.txt
+pick 286d656 Add sceptile.txt
+-- .git/golden-log --
+* a71bab3 (HEAD -> turtwig) Amend turtwig.txt
+* 689eb6b (sceptile) Add sceptile.txt
+* 64f5fcb Add grovyle.txt
+* 68f0d35 Add treecko.txt
+* a7c56ea (master) Add dummy.txt
+* cbfe4ef initial commit