filter-repo: add a fairly thorough test for --analyze

The test does check the exact output for the report, meaning if the
output is changed at all this test will need to be updated, but it at
least makes sure we are getting all the right kinds of information.  I
do not expect the output format will change very often.

Signed-off-by: Elijah Newren <newren@gmail.com>

t/t9390-filter-repo.sh

@@ -282,4 +282,168 @@ test_expect_success 'refs/replace/ to add more initial history' '
 	)
 '
 
+test_expect_success 'setup analyze_me' '
+	test_create_repo analyze_me &&
+	(
+		cd analyze_me &&
+		mkdir numbers words &&
+		test_seq 1 10 >numbers/small.num &&
+		test_seq 100 110 >numbers/medium.num &&
+		echo spam >words/to &&
+		echo eggs >words/know &&
+		echo rename a lot >fickle &&
+		git add numbers words fickle &&
+		test_tick &&
+		git commit -m initial &&
+
+		git branch other &&
+		git mv fickle capricious &&
+		test_tick &&
+		git commit -m "rename on main branch" &&
+
+		git checkout other &&
+		echo random other change >whatever &&
+		git add whatever &&
+		git mv fickle capricious &&
+		test_tick &&
+		git commit -m "rename on other branch" &&
+
+		git checkout master &&
+		git merge --no-commit other &&
+		git mv capricious mercurial &&
+		test_tick &&
+		git commit &&
+
+		git mv words sequence &&
+		test_tick &&
+		git commit -m now.sequence &&
+
+		git rm -rf numbers &&
+		test_tick &&
+		git commit -m remove.words &&
+
+		mkdir words &&
+		echo no >words/know &&
+		git add words/know &&
+		test_tick &&
+		git commit -m "Recreated file previously renamed" &&
+
+		echo "160000 deadbeefdeadbeefdeadbeefdeadbeefdeadbeefQfake_submodule" | q_to_tab | git update-index --index-info &&
+		test_tick &&
+		git commit -m "Add a fake submodule" &&
+
+		test_tick &&
+		git commit --allow-empty -m "Final commit, empty" &&
+
+		# Add a random extra unreferenced object
+		echo foobar | git hash-object --stdin -w
+	)
+'
+
+test_expect_success '--analyze' '
+	(
+		cd analyze_me &&
+
+		git filter-repo --analyze &&
+
+		# It should work and overwrite report if run again
+		git filter-repo --analyze &&
+
+		test -d .git/filter-repo/analysis &&
+		cd .git/filter-repo/analysis &&
+
+		cat >expect <<-EOF &&
+		fickle ->
+		    capricious
+		    mercurial
+		words/to ->
+		    sequence/to
+		EOF
+		test_cmp expect renames.txt &&
+
+		cat >expect <<-EOF &&
+		== Overal Statistics ==
+		  Number of commits:         9
+		  Number of filenames:       10
+		  Number of directories:     4
+		  Number of file extensions: 2
+
+		  Total unpacked size (bytes):        147
+		  Total packed size (bytes):          306
+
+		EOF
+		head -n 9 README >actual &&
+		test_cmp expect actual &&
+
+		cat | tr Q "\047" >expect <<-\EOF &&
+		== Files by sha and associated pathnames in reverse size ==
+		Format: sha, unpacked size, packed size, filename(s) object stored as
+		  a89c82a2d4b713a125a4323d25adda062cc0013d         44         48 numbers/medium.num
+		  f00c965d8307308469e537302baa73048488f162         21         37 numbers/small.num
+		  2aa69a2a708eed00cb390e30f6bcc3eed773f390         20         36 whatever
+		  51b95456de9274c9a95f756742808dfd480b9b35         13         29 [QcapriciousQ, QfickleQ, QmercurialQ]
+		  34b6a0c9d02cb6ef7f409f248c0c1224ce9dd373          5         20 [Qsequence/toQ, Qwords/toQ]
+		  732c85a1b3d7ce40ec8f78fd9ffea32e9f45fae0          5         20 [Qsequence/knowQ, Qwords/knowQ]
+		  7ecb56eb3fa3fa6f19dd48bca9f971950b119ede          3         18 words/know
+		EOF
+		test_cmp expect blob-shas-and-paths.txt &&
+
+		cat >expect <<-EOF &&
+		=== All directories by reverse size ===
+		Format: unpacked size, packed size, date deleted, directory name
+		         147        306 <present>  <toplevel>
+		          65         85 2005-04-07 numbers
+		          13         58 <present>  words
+		          10         40 <present>  sequence
+		EOF
+		test_cmp expect directories-all-sizes.txt &&
+
+		cat >expect <<-EOF &&
+		=== Deleted directories by reverse size ===
+		Format: unpacked size, packed size, date deleted, directory name
+		          65         85 2005-04-07 numbers
+		EOF
+		test_cmp expect directories-deleted-sizes.txt &&
+
+		cat >expect <<-EOF &&
+		=== All extensions by reverse size ===
+		Format: unpacked size, packed size, date deleted, extension name
+		          82        221 <present>  <no extension>
+		          65         85 2005-04-07 .num
+		EOF
+		test_cmp expect extensions-all-sizes.txt &&
+
+		cat >expect <<-EOF &&
+		=== Deleted extensions by reverse size ===
+		Format: unpacked size, packed size, date deleted, extension name
+		          65         85 2005-04-07 .num
+		EOF
+		test_cmp expect extensions-deleted-sizes.txt &&
+
+		cat >expect <<-EOF &&
+		=== All paths by reverse accumulated size ===
+		Format: unpacked size, packed size, date deleted, pathectory name
+		          44         48 2005-04-07 numbers/medium.num
+		           8         38 <present>  words/know
+		          21         37 2005-04-07 numbers/small.num
+		          20         36 <present>  whatever
+		          13         29 <present>  fickle
+		          13         29 <present>  mercurial
+		          13         29 <present>  capricious
+		           5         20 <present>  words/to
+		           5         20 <present>  sequence/know
+		           5         20 <present>  sequence/to
+		EOF
+		test_cmp expect path-all-sizes.txt &&
+
+		cat >expect <<-EOF &&
+		=== Deleted paths by reverse accumulated size ===
+		Format: unpacked size, packed size, date deleted, path name(s)
+		          44         48 2005-04-07 numbers/medium.num
+		          21         37 2005-04-07 numbers/small.num
+		EOF
+		test_cmp expect path-deleted-sizes.txt
+	)
+'
+
 test_done