diff --git a/tests/operations/index.mjs b/tests/operations/index.mjs
index 9fccd051..9d803bcc 100644
--- a/tests/operations/index.mjs
+++ b/tests/operations/index.mjs
@@ -153,6 +153,7 @@ import "./tests/SIGABA.mjs";
 import "./tests/SM2.mjs";
 import "./tests/SM4.mjs";
 // import "./tests/SplitColourChannels.mjs"; // Cannot test operations that use the File type yet
+import "./tests/SQLBeautify.mjs";
 import "./tests/StrUtils.mjs";
 import "./tests/StripIPv4Header.mjs";
 import "./tests/StripTCPHeader.mjs";
diff --git a/tests/operations/tests/SQLBeautify.mjs b/tests/operations/tests/SQLBeautify.mjs
new file mode 100644
index 00000000..92d02ade
--- /dev/null
+++ b/tests/operations/tests/SQLBeautify.mjs
@@ -0,0 +1,54 @@
+/**
+ * SQLBeautify tests.
+ *
+ * @author GCHQDeveloper581
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "SQL Beautify - basic",
+        input: "SELECT MONTH, ID, RAIN_I, TEMP_F FROM STATS;",
+        expectedOutput:
+`SELECT
+  MONTH,
+  ID,
+  RAIN_I,
+  TEMP_F
+FROM
+  STATS;`,
+        recipeConfig: [
+            {
+                op: "SQL Beautify",
+                args: ["  "],
+            },
+        ],
+    },
+    {
+        name: "SQL Beautify - upsert",
+        input: "INSERT INTO Table1 SELECT * FROM (SELECT :Bind1 as Field1, :Bind2 as Field2, :id as id) as new_data ON DUPLICATE KEY UPDATE Field1 = new_data.Field1, Field2 = new_data.Field2;",
+        expectedOutput:
+`INSERT INTO
+  Table1
+SELECT
+  *
+FROM
+  (
+    SELECT
+      :Bind1 as Field1,
+      :Bind2 as Field2,
+      :id as id
+  ) as new_data
+ON DUPLICATE KEY UPDATE
+  Field1 = new_data.Field1,
+  Field2 = new_data.Field2;`,
+        recipeConfig: [
+            {
+                op: "SQL Beautify",
+                args: ["  "],
+            },
+        ],
+    },
+]);