Add files via upload

AutoComplete/AutoCompleteController.cls

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+public with sharing class AutoCompleteController {
+    @AuraEnabled(cacheable=true)
+    public static List<SObject> getRecords(String searchString, String objectApiName, String idFieldApiName, String valueFieldApiName, String extendedWhereClause, Integer maxRecords){
+        searchString = String.escapeSingleQuotes(searchString);
+        objectApiName = String.escapeSingleQuotes(objectApiName);
+        idFieldApiName = String.escapeSingleQuotes(idFieldApiName);
+        valueFieldApiName = String.escapeSingleQuotes(valueFieldApiName);
+
+        if(extendedWhereClause == null){
+            extendedWhereClause = '';
+        }
+
+        String query = 'SELECT '+idFieldApiName+', '+valueFieldApiName+' FROM '+objectApiName+' WHERE '+valueFieldApiName+' LIKE \'%'+searchString+'%\' '+extendedWhereClause+' LIMIT '+maxRecords;
+        return Database.query(query);
+    }
+}

AutoComplete/AutoCompleteController.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="urn:metadata.tooling.soap.sforce.com" fqn="AutoCompleteController">
+    <apiVersion>45.0</apiVersion>
+    <status>Active</status>
+</ApexClass>

AutoComplete/AutoCompleteControllerTest.cls

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+@isTest
+public with sharing class AutoCompleteControllerTest {
+    @TestSetup
+    static void makeData(){
+        Account acc = new Account(Name='Salesforce');
+        insert acc;
+    }
+
+    @isTest
+    public static void testGetRecords(){
+        List<SObject> accounts = AutoCompleteController.getRecords('sales', 'Account', 'Id', 'Name', null, 10);
+        System.assertEquals(1, accounts.size());
+        accounts = AutoCompleteController.getRecords('abc', 'Account', 'Id', 'Name', '', 100);
+        System.assertEquals(0, accounts.size());
+    }
+}

AutoComplete/AutoCompleteControllerTest.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="urn:metadata.tooling.soap.sforce.com" fqn="AutoCompleteControllerTest">
+    <apiVersion>45.0</apiVersion>
+    <status>Active</status>
+</ApexClass>