From 93f16a6297b85af1e1b3c593f9126909df25092f Mon Sep 17 00:00:00 2001
From: Martin Sumner <martin.sumner@adaptip.co.uk>
Date: Tue, 5 Jun 2018 16:48:56 +0100
Subject: [PATCH] Unit test - GC

End up with right number of manifest files
---
 src/leveled_pmanifest.erl | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/src/leveled_pmanifest.erl b/src/leveled_pmanifest.erl
index fba14da..51eb3bb 100644
--- a/src/leveled_pmanifest.erl
+++ b/src/leveled_pmanifest.erl
@@ -869,6 +869,9 @@ seconds_now() ->
 -ifdef(TEST).
 
 initial_setup() -> 
+    initial_setup(single_change).
+
+initial_setup(Changes) ->
     E1 = #manifest_entry{start_key={i, "Bucket1", {"Idx1", "Fld1"}, "K8"},
                             end_key={i, "Bucket1", {"Idx1", "Fld9"}, "K93"},
                             filename="Z1",
@@ -899,7 +902,10 @@ initial_setup() ->
                             filename="Z6",
                             owner="pid_z6",
                             bloom=none},
-    
+    initial_setup(Changes, E1, E2, E3, E4, E5, E6).    
+
+
+initial_setup(single_change, E1, E2, E3, E4, E5, E6) ->
     Man0 = new_manifest(),
     
     Man1 = insert_manifest_entry(Man0, 1, 1, E1),
@@ -909,8 +915,20 @@ initial_setup() ->
     Man5 = insert_manifest_entry(Man4, 1, 2, E5),
     Man6 = insert_manifest_entry(Man5, 1, 2, E6),
     ?assertMatch(Man6, insert_manifest_entry(Man6, 1, 2, [])),
+    {Man0, Man1, Man2, Man3, Man4, Man5, Man6};
+initial_setup(multi_change, E1, E2, E3, E4, E5, E6) ->
+    Man0 = new_manifest(),
+    
+    Man1 = insert_manifest_entry(Man0, 1, 1, E1),
+    Man2 = insert_manifest_entry(Man1, 2, 1, E2),
+    Man3 = insert_manifest_entry(Man2, 3, 1, E3),
+    Man4 = insert_manifest_entry(Man3, 4, 2, E4),
+    Man5 = insert_manifest_entry(Man4, 5, 2, E5),
+    Man6 = insert_manifest_entry(Man5, 6, 2, E6),
+    ?assertMatch(Man6, insert_manifest_entry(Man6, 6, 2, [])),
     {Man0, Man1, Man2, Man3, Man4, Man5, Man6}.
 
+
 changeup_setup(Man6) ->
     E1 = #manifest_entry{start_key={i, "Bucket1", {"Idx1", "Fld1"}, "K8"},
                             end_key={i, "Bucket1", {"Idx1", "Fld9"}, "K93"},
@@ -971,6 +989,18 @@ random_select_test() ->
     Level1 = array:get(1, LastManifest#manifest.levels),
     ?assertMatch(true, lists:member(L1File, Level1)).
 
+manifest_gc_test() ->
+    RP = "../test_gc",
+    ok = filelib:ensure_dir(RP),
+    ManifestT = initial_setup(multi_change),
+    ManifestL = tuple_to_list(ManifestT),
+    lists:foreach(fun(M) -> save_manifest(M, RP) end, ManifestL),
+    {ok, FNs} = file:list_dir(filepath(RP, manifest)),
+    io:format("FNs ~w~n", [FNs]),
+    ?assertMatch(true, length(ManifestL) > ?MANIFESTS_TO_RETAIN),
+    ?assertMatch(?MANIFESTS_TO_RETAIN, length(FNs)).
+
+
 keylookup_manifest_test() ->
     {Man0, Man1, Man2, Man3, _Man4, _Man5, Man6} = initial_setup(),
     LK1_1 = {o, "Bucket1", "K711", null},