add a couple tests to show what I'm talking about

.gitignore

@@ -1,5 +1,5 @@
-
+.idea
 .df-credentials.json
 node_modules/
 
-.DS_Store
+.DS_Store

includes/deduplicate.js

@@ -18,6 +18,4 @@ function deduplicate(relation, partition_by, order_by, incremental) {
 }
 
 
-module.exports = {
-    deduplicate
-}
+module.exports = deduplicate

includes/deduplicate.spec.js

@@ -0,0 +1,8 @@
+const { deduplicate } = require('../')
+
+describe('deduplicate', () => {
+    it('works better as an exported function than as an object', () => {
+        const deduped = deduplicate('relation', 'partition_by', 'order_by', 'incremental')
+        expect(deduped).toBeTruthy()
+    })
+})

includes/group_by.spec.js

@@ -0,0 +1,7 @@
+const { group_by } = require('../')
+
+describe('group_by', () => {
+    it('is awkward to import this one', () => {
+        expect(group_by.group_by(0, [])).toEqual('group by ')
+    })
+})

package.json

@@ -1,5 +1,12 @@
 {
+    "scripts": {
+        "test": "jest",
+        "test.watch": "jest --watch"
+    },
     "dependencies": {
         "@dataform/core": "^2.7.0"
+    },
+    "devDependencies": {
+        "jest": "^29.7.0"
     }
 }