Can Select From an object

PROJECT.md

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+# Project DATUM
+
+1. Write a QueryBuilder
+2. Write a In Memory DB
+3. Write a System (Salesforce) DB
+4. They should all work with the same interface

force-app/spec/QueryBuilderTest.cls

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+@IsTest
+private class QueryBuilderTest {
+    // RED, GREEN, REFACTOR
+
+    @IsTest
+    static void canSelectFromAnObject_systemDb() {
+        // Given an account in the DB
+        Account account = new Account(Name = 'Test Account');
+        QDB.doInsert(account);
+
+        // By default when you don't specify any fields, it is going to select the Id
+        QueryBuilder builder = QueryBuilder.of('Account');
+
+        // When I run the query
+        List<Account> accounts = builder.query(builder);
+
+        Assert.areEqual(1, accounts.size());
+        Assert.areEqual(account.Id, accounts[0].Id);
+    }
+
+    // TODO: Can query an object
+    // TODO: Can query specific fields out of an object
+    // TODO: Support bulk insert
+}

force-app/spec/QueryBuilderTest.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>60.0</apiVersion>
+    <status>Active</status>
+</ApexClass>

force-app/src/QDB.cls

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+public with sharing class QDB {
+    public static void doInsert(Account account) {
+        insert account;
+    }
+}

force-app/src/QDB.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>60.0</apiVersion>
+    <status>Active</status>
+</ApexClass>

force-app/src/QueryBuilder.cls

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+public with sharing class QueryBuilder {
+    public static QueryBuilder of(String objectType) {
+        return new QueryBuilder();
+    }
+
+    public List<Account> query(QueryBuilder queryBuilder) {
+        return [SELECT Id FROM Account];
+    }
+}

force-app/src/QueryBuilder.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>60.0</apiVersion>
+    <status>Active</status>
+</ApexClass>