diff --git a/src/main.rs b/src/main.rs
index acb80af..fbb2b49 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,9 @@ mod storage;
 mod storage_server;
 use clap::Parser;
 
+#[cfg(test)]
+mod tests;
+
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
 struct Args {
diff --git a/src/storage/world.rs b/src/storage/world.rs
index d34130f..bd5b411 100644
--- a/src/storage/world.rs
+++ b/src/storage/world.rs
@@ -14,6 +14,9 @@ struct ChunkSection {
     /// section contains a 16 x 16 x 16 cube of blocks = 4096 blocks
     /// If the section is empty, this is skipped
     block_count: u16,
+    /// The data for all the blocks in the chunk
+    /// The representation for this may be different based on the number of
+    /// non-empty blocks
     block_states: [BlockID; 4096],
 }
 
diff --git a/src/tests/insert_one.rs b/src/tests/insert_one.rs
new file mode 100644
index 0000000..70912be
--- /dev/null
+++ b/src/tests/insert_one.rs
@@ -0,0 +1,7 @@
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn add_one_block() {
+        assert_eq!(1, 1);
+    }
+}
diff --git a/src/tests/mod.rs b/src/tests/mod.rs
new file mode 100644
index 0000000..9d5f059
--- /dev/null
+++ b/src/tests/mod.rs
@@ -0,0 +1,2 @@
+mod insert_one;
+