diff --git a/test-nn.cr b/test-nn.cr
new file mode 100644
index 0000000..0187900
--- /dev/null
+++ b/test-nn.cr
@@ -0,0 +1,57 @@
+require "json"
+require "uuid/json"
+require "./src/fs.cr"
+
+class Article
+	JSON.mapping({
+		title: String,
+		id: String,
+		tags: Array(String)
+	})
+	def initialize(@title, @tags)
+		@id = UUID.random.to_s
+	end
+end
+
+s = FS::Hash(String, Article).new "test-storage-nn"
+
+s.new_nn_partition "tags", &.tags.map(&.downcase)
+
+article = Article.new "Mutsuki", ["mutsuki", "kuchikukan"]
+s[article.id] = article
+
+article = Article.new "Kisaragi", ["mutsuki", "kuchikukan"]
+s[article.id] = article
+
+article = Article.new "Kongou", ["kongou", "senkan"]
+s[article.id] = article
+
+article = Article.new "Haruna", ["kongou", "senkan"]
+s[article.id] = article
+
+article = Article.new "Satsuki", ["mutsuki", "kuchikukan"]
+s[article.id] = article
+
+article = Article.new "Shiratsuyu", ["shiratsuyu", "kuchikukan"]
+s[article.id] = article
+
+article = Article.new "Yuudachi", ["shiratsuyu", "kuchikukan"]
+s[article.id] = article
+
+pp! s.get_nn_partition("tags", "senkan").map &.title
+pp! s.get_nn_partition("tags", "kuchikukan").map &.title
+pp! s.get_nn_partition("tags", "mutsuki").map &.title
+pp! s.get_nn_partition("tags", "shiratsuyu").map &.title
+
+s.to_h.size.times do
+	first = s.to_h.to_a[0][1]
+	puts "Testing removal of the “#{first.title}” item."
+
+	s.delete first.id
+
+	pp! s.get_nn_partition("tags", "senkan").map &.title
+	pp! s.get_nn_partition("tags", "kuchikukan").map &.title
+	pp! s.get_nn_partition("tags", "mutsuki").map &.title
+	pp! s.get_nn_partition("tags", "shiratsuyu").map &.title
+end
+