From 08c59f98a558acd7f166e5382a1b2fec5b57d68c Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 4 Nov 2015 11:40:23 -0500
Subject: [PATCH] Add an idempotence test for pruning.

---
 doc/TODO           |  2 --
 test/test_prune.rb | 47 +++++++++++++++++++++++++++++++++++++---------
 2 files changed, 38 insertions(+), 11 deletions(-)

diff --git a/doc/TODO b/doc/TODO
index 5b007a9..92a90b4 100644
--- a/doc/TODO
+++ b/doc/TODO
@@ -15,8 +15,6 @@
 
 * Write a man page.
 
-* Tests: Add an idempotence test for prune.
-
 * Tests: Check that child tables contain what they're supposed to, too.
 
 * Update the README.
diff --git a/test/test_prune.rb b/test/test_prune.rb
index 94b8196..a0e6941 100644
--- a/test/test_prune.rb
+++ b/test/test_prune.rb
@@ -14,17 +14,11 @@ require 'prune/prune_runner'
 
 class TestPrune < MailshearsTest
 
-  def test_single_prune
+  def check_assertions(actual)
     cfg = configuration()
 
-    output_buffer = StringIO.new()
-
-    $stdout = output_buffer
-    PrunePlugin.run(cfg)
-    $stdout = STDOUT
-
-    actual = output_buffer.string()
-
+    # Both of our tests have the same expected output / results, so
+    # check them both using the same function.
     expected =
       "AgendavPrune - Removed user booger@example.com.\n" +
       "DavicalPrune - Removed user booger@example.com (Principal ID: 2).\n" +
@@ -86,4 +80,39 @@ class TestPrune < MailshearsTest
     assert(!maildir_exists('example.com/jeremy'))
   end
 
+
+  def test_single_prune()
+    # Run prune once and see what happens.
+    cfg = configuration()
+
+    output_buffer = StringIO.new()
+
+    $stdout = output_buffer
+    PrunePlugin.run(cfg)
+    $stdout = STDOUT
+
+    actual = output_buffer.string()
+
+    check_assertions(actual)
+  end
+
+
+  def test_double_prune
+    # Run prune twice. This should have the exact same output as
+    # running it once, since the second time around, there's nothing
+    # to prune.
+    cfg = configuration()
+
+    output_buffer = StringIO.new()
+
+    $stdout = output_buffer
+    PrunePlugin.run(cfg)
+    PrunePlugin.run(cfg)
+    $stdout = STDOUT
+
+    actual = output_buffer.string()
+
+    check_assertions(actual)
+  end
+
 end
-- 
2.43.2