From b33927cec73f07e66f3166cfd5db7e662efd1c28 Mon Sep 17 00:00:00 2001
From: Brent Roose <brent@spatie.be>
Date: Tue, 18 Dec 2018 08:47:07 +0100
Subject: [PATCH] Support edge case for two period diffs

---
 CHANGELOG.md         |  4 ++++
 src/Period.php       |  6 ++----
 tests/PeriodTest.php | 18 ++++++++++++++++++
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d91d6d..94de611 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ All notable changes to `period` will be documented in this file
 
 - initial release
 
+## 0.3.3 - 2018-12-18
+
+- Support edge case for two period diffs
+
 ## 0.3.2 - 2018-12-11
 
 - Add better return types to support inherited periods
diff --git a/src/Period.php b/src/Period.php
index ed429c6..7726647 100644
--- a/src/Period.php
+++ b/src/Period.php
@@ -318,12 +318,10 @@ public function diffSingle(Period $period): PeriodCollection
 
     public function diff(Period ...$periods): PeriodCollection
     {
-        if (count($periods) === 1) {
+        if (count($periods) === 1 && ! $this->overlapsWith($periods[0])) {
             $collection = new PeriodCollection();
 
-            if (! $this->overlapsWith($periods[0])) {
-                $collection[] = $this->gap($periods[0]);
-            }
+            $collection[] = $this->gap($periods[0]);
 
             return $collection;
         }
diff --git a/tests/PeriodTest.php b/tests/PeriodTest.php
index cb0f8f5..a04df74 100644
--- a/tests/PeriodTest.php
+++ b/tests/PeriodTest.php
@@ -476,4 +476,22 @@ public function if_will_use_the_start_of_day_when_passing_strings_to_a_period()
             )
         ));
     }
+
+    /**
+     * @test
+     *
+     * A        [=============================]
+     * B            [========]
+     *
+     * DIFF     [==]          [===============]
+     */
+    public function diff_with_one_period_within()
+    {
+        $a = Period::make('2018-01-01', '2018-01-31');
+        $b = Period::make('2018-01-10', '2018-01-15');
+
+        $diff = $a->diff($b);
+
+        $this->assertCount(2, $diff);
+    }
 }