[PATCH v2 09/16] t3427: condense the unnecessarily repetitive test cases into three

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

Previously, this test script performed essentially three rebases and
verified breakages by testing the post-rebase commits' messages.

To do so, the rebases were performed multiple times, though, once per
commit message to test. This wastes electricity (and CO2) and time.

Let's condense the test cases to the essential number: the number of
different rebases to validate.

On Windows, where the scripted nature of the `--preserve-merges` backend
hurts performance rather badly, this reduces the overall runtime in this
developer's setup from ~1m to ~28s while still performing the exact same
testing as before.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t3427-rebase-subtree.sh | 61 +++++++--------------------------------
 1 file changed, 11 insertions(+), 50 deletions(-)

diff --git a/t/t3427-rebase-subtree.sh b/t/t3427-rebase-subtree.sh
index 64ba95f3e0..b21925d279 100755
--- a/t/t3427-rebase-subtree.sh
+++ b/t/t3427-rebase-subtree.sh
@@ -64,70 +64,31 @@ test_expect_success 'setup' '
 '
 
 # FAILURE: Does not preserve master4.
-test_expect_failure REBASE_P \
-	'Rebase -Xsubtree --preserve-merges --onto commit 4' '
+test_expect_failure REBASE_P 'Rebase -Xsubtree --preserve-merges --onto commit' '
 	reset_rebase &&
-	git checkout -b rebase-preserve-merges-4 to-rebase &&
-	git rebase -Xsubtree=files_subtree --preserve-merges --onto files-master master &&
-	verbose test "$(commit_message HEAD~)" = "files_subtree/master4"
-'
-
-# FAILURE: Does not preserve master5.
-test_expect_failure REBASE_P \
-	'Rebase -Xsubtree --preserve-merges --onto commit 5' '
-	reset_rebase &&
-	git checkout -b rebase-preserve-merges-5 to-rebase &&
+	git checkout -b rebase-preserve-merges to-rebase &&
 	git rebase -Xsubtree=files_subtree --preserve-merges --onto files-master master &&
+	verbose test "$(commit_message HEAD~)" = "files_subtree/master4" &&
 	verbose test "$(commit_message HEAD)" = "files_subtree/master5"
 '
 
 # FAILURE: Does not preserve master4.
-test_expect_failure REBASE_P \
-	'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit 4' '
+test_expect_failure REBASE_P 'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit' '
 	reset_rebase &&
-	git checkout -b rebase-keep-empty-4 to-rebase &&
-	git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
-	verbose test "$(commit_message HEAD~2)" = "files_subtree/master4"
-'
-
-# FAILURE: Does not preserve master5.
-test_expect_failure REBASE_P \
-	'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit 5' '
-	reset_rebase &&
-	git checkout -b rebase-keep-empty-5 to-rebase &&
-	git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
-	verbose test "$(commit_message HEAD~)" = "files_subtree/master5"
-'
-
-# FAILURE: Does not preserve Empty.
-test_expect_failure REBASE_P \
-	'Rebase -Xsubtree --keep-empty --preserve-merges --onto empty commit' '
-	reset_rebase &&
-	git checkout -b rebase-keep-empty-empty to-rebase &&
+	git checkout -b rebase-keep-empty to-rebase &&
 	git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
+	verbose test "$(commit_message HEAD~2)" = "files_subtree/master4" &&
+	verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
 	verbose test "$(commit_message HEAD)" = "Empty commit"
 '
 
 # FAILURE: fatal: Could not parse object
-test_expect_failure 'Rebase -Xsubtree --onto commit 4' '
-	reset_rebase &&
-	git checkout -b rebase-onto-4 to-rebase &&
-	git rebase -Xsubtree=files_subtree --onto files-master master &&
-	verbose test "$(commit_message HEAD~2)" = "files_subtree/master4"
-'
-
-# FAILURE: fatal: Could not parse object
-test_expect_failure 'Rebase -Xsubtree --onto commit 5' '
-	reset_rebase &&
-	git checkout -b rebase-onto-5 to-rebase &&
-	git rebase -Xsubtree=files_subtree --onto files-master master &&
-	verbose test "$(commit_message HEAD~)" = "files_subtree/master5"
-'
-# FAILURE: fatal: Could not parse object
-test_expect_failure 'Rebase -Xsubtree --onto empty commit' '
+test_expect_failure 'Rebase -Xsubtree --onto commit' '
 	reset_rebase &&
-	git checkout -b rebase-onto-empty to-rebase &&
+	git checkout -b rebase-onto to-rebase &&
 	git rebase -Xsubtree=files_subtree --onto files-master master &&
+	verbose test "$(commit_message HEAD~2)" = "files_subtree/master4" &&
+	verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
 	verbose test "$(commit_message HEAD)" = "Empty commit"
 '
 
-- 
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