From 335fb45de605016dc41bec9b2563e9cd497c009c Mon Sep 17 00:00:00 2001
From: Alex Ling <hkalexling@gmail.com>
Date: Thu, 12 Mar 2020 23:47:14 +0000
Subject: [PATCH] Add spec for `util.cr`

---
 spec/util_spec.cr | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 spec/util_spec.cr

diff --git a/spec/util_spec.cr b/spec/util_spec.cr
new file mode 100644
index 0000000..b2f2c2c
--- /dev/null
+++ b/spec/util_spec.cr
@@ -0,0 +1,28 @@
+require "./spec_helper"
+
+describe "compare_alphanumerically" do
+	it "sorts filenames with leading zeros correctly" do
+		ary = ["010.jpg", "001.jpg", "002.png"]
+		ary.sort! {|a, b|
+			compare_alphanumerically a, b
+		}
+		ary.should eq ["001.jpg", "002.png", "010.jpg"]
+	end
+
+	it "sorts filenames without leading zeros correctly" do
+		ary = ["10.jpg", "1.jpg", "0.png", "0100.jpg"]
+		ary.sort! {|a, b|
+			compare_alphanumerically a, b
+		}
+		ary.should eq ["0.png", "1.jpg", "10.jpg", "0100.jpg"]
+	end
+
+	# https://ux.stackexchange.com/a/95441
+	it "sorts like the stack exchange post" do
+		ary = ["2", "12", "200000", "1000000", "a", "a12", "b2", "text2",
+		 "text2a", "text2a2", "text2a12", "text2ab", "text12", "text12a"]
+		ary.reverse.sort {|a, b|
+			compare_alphanumerically a, b
+		}.should eq ary
+	end
+end