diff --git a/tests/merge.rs b/tests/merge.rs
new file mode 100644
index 0000000..b517d97
--- /dev/null
+++ b/tests/merge.rs
@@ -0,0 +1,100 @@
+mod common;
+
+use std::str::FromStr;
+
+use async_tempfile::TempFile;
+use clap::Parser;
+use color_eyre::Result;
+use ctor::ctor;
+use rand::{distributions::Alphanumeric, thread_rng, Rng};
+use tokio::{fs::remove_dir_all, io::AsyncWriteExt};
+use toshokan::{
+    args::{DropArgs, IndexArgs, MergeArgs},
+    commands::{
+        create::run_create_from_config, drop::run_drop, index::run_index, merge::run_merge,
+    },
+    config::IndexConfig,
+};
+
+use crate::common::{get_number_of_files_in_dir, run_postgres, search_one, test_init};
+
+#[ctor]
+fn init() {
+    test_init();
+}
+
+#[tokio::test]
+async fn test_merge() -> Result<()> {
+    let postgres = run_postgres().await?;
+    let mut config = IndexConfig::from_str(include_str!("../example_config.yaml"))?;
+
+    config.path = format!(
+        "/tmp/{}",
+        thread_rng()
+            .sample_iter(&Alphanumeric)
+            .take(16)
+            .map(char::from)
+            .collect::<String>()
+    );
+
+    // Just in case this path already exists, remove it.
+    let _ = remove_dir_all(&config.path).await;
+
+    run_create_from_config(&config, &postgres.pool).await?;
+
+    let mut file_to_index1 = TempFile::new().await?;
+    file_to_index1
+        .write_all(r#"{"timestamp":1460530013,"severity_text":"INFO","body":"PacketResponder: BP-108841162-10.10.34.11-1440074360971:blk_1074072698_331874, type=HAS_DOWNSTREAM_IN_PIPELINE terminating","resource":{"service":"datanode/01"},"attributes":{"class":"org.apache.hadoop.hdfs.server.datanode.DataNode"},"tenant_id":58}"#.as_bytes())
+        .await?;
+    let mut file_to_index2 = TempFile::new().await?;
+    file_to_index2
+        .write_all(r#"{"timestamp":1460530014,"severity_text":"INFO","body":"Receiving BP-108841162-10.10.34.11-1440074360971:blk_1074072706_331882 src: /10.10.34.33:42666 dest: /10.10.34.11:50010","resource":{"service":"datanode/01"},"attributes":{"class":"org.apache.hadoop.hdfs.server.datanode.DataNode"},"tenant_id":46}"#.as_bytes())
+        .await?;
+
+    run_index(
+        IndexArgs::parse_from([
+            "",
+            &config.name,
+            &file_to_index1.file_path().to_string_lossy(),
+        ]),
+        &postgres.pool,
+    )
+    .await?;
+    run_index(
+        IndexArgs::parse_from([
+            "",
+            &config.name,
+            &file_to_index2.file_path().to_string_lossy(),
+        ]),
+        &postgres.pool,
+    )
+    .await?;
+
+    assert_eq!(get_number_of_files_in_dir(&config.path).await?, 2);
+
+    // Search once before merge.
+    search_one(
+        &config.name,
+        "tenant_id:>50 AND severity_text:INFO",
+        &postgres.pool,
+    )
+    .await?;
+    search_one(&config.name, "body:Receiving", &postgres.pool).await?;
+
+    run_merge(MergeArgs::parse_from(["", &config.name]), &postgres.pool).await?;
+    assert_eq!(get_number_of_files_in_dir(&config.path).await?, 1);
+
+    // Search again after merge.
+    search_one(
+        &config.name,
+        "tenant_id:>50 AND severity_text:INFO",
+        &postgres.pool,
+    )
+    .await?;
+    search_one(&config.name, "body:Receiving", &postgres.pool).await?;
+
+    run_drop(DropArgs::parse_from(["", &config.name]), &postgres.pool).await?;
+    assert_eq!(get_number_of_files_in_dir(&config.path).await?, 0);
+
+    Ok(())
+}