What is the test.setMock scope?

HTTP-class callouts and WSDL-generated code only.

What is the per-endpoint static bodies?

MultiStaticResourceCalloutMock.setStaticResource(endpoint, name).

WebServiceMock.doInvoke() puts responsex in the response map.

What is DML then mocked callout?

startTest before setMock; DML outside the block.

What is the stub API can't mock?

Static, private, properties, triggers, inner classes, system types, Batchable, private-only constructors.

What is the @testSetup?

One per class; static context reset before each test method.

What is SOSL in tests?

Empty results unless Test.setFixedSearchResults().

What is the batch in tests?

Only one execute call can be tested.

Testing, Debugging, and Deployment20% of the exam

Apex mocks, stubs and advanced test techniques

Pick the right callout mock (HttpCalloutMock, static resource mocks, WebServiceMock), isolate classes with the Stub API and dependency injection, and control test context with @TestVisible, @testSetup, event delivery, fixed SOSL results, setCreatedDate, runAs and Assert-based negative and bulk tests.

Official exam objective

Apply advanced techniques and tools for testing Apex classes and triggers, such as mocks and stubs.

~8 min read · 15 practice questions · updated Oct 16, 2026

What the exam expects

Choose between HttpCalloutMock, StaticResourceCalloutMock, MultiStaticResourceCalloutMock and WebServiceMock for a given callout, and fix a test that does DML before a mocked callout.
Isolate a class with the Stub API (Test.createStub() plus StubProvider), inject the stub, and name what the Stub API can't mock.
Control the test context: @TestVisible, @testSetup and static variables, Test.loadData(), Test.setFixedSearchResults(), Test.setCreatedDate(), batch and event delivery, and System.runAs() with class sharing modes.
Write negative and bulk tests that follow Salesforce's testing best practices.

Key terms: mock (a test-only object that returns a canned callout response); stub (a runtime-generated subclass whose methods StubProvider.handleMethodCall() answers); dependency injection (handing a collaborator to a class instead of letting it new its own); test event bus (the separate bus that holds platform and change events in tests until they are delivered); static context (the static variables of a test class, reinitialized per test method).

This unit assumes the basics in the Platform Developer guide's Writing and running Apex and Flow tests (@IsTest, data isolation, startTest/stopTest, coverage).

Key facts

Fact	Detail	Source
`Test.setMock` scope	HTTP-class callouts and WSDL-generated code only	Test Class (opens in a new tab)
Per-endpoint static bodies	`MultiStaticResourceCalloutMock.setStaticResource(endpoint, name)`	Static Resource Callout Mocks (opens in a new tab)
SOAP mock	`WebServiceMock.doInvoke()` puts `response_x` in the response map	Test Web Service Callouts (opens in a new tab)
DML then mocked callout	`startTest` before `setMock`; DML outside the block	DML and Mock Callouts (opens in a new tab)
Stub API can't mock	Static, private, properties, triggers, inner classes, system types, Batchable, private-only constructors	Stub API (opens in a new tab)
`@testSetup`	One per class; static context reset before each test method	Using Test Setup Methods (opens in a new tab)
SOSL in tests	Empty results unless `Test.setFixedSearchResults()`	SOSL in Unit Tests (opens in a new tab)
Batch in tests	Only one `execute` call can be tested	Use Batch Apex (opens in a new tab)
Change events in tests	`enableChangeDataCapture()` first; up to 500 events delivered	Test Change Event Triggers (opens in a new tab)
`runAs` and called classes	Called method uses its own class's sharing mode	Using the runAs Method (opens in a new tab)
Bulk trigger tests	At least 20 records	Testing Best Practices (opens in a new tab)

Test.setMock scope

Detail: HTTP-class callouts and WSDL-generated code only
Source: Test Class (opens in a new tab)

Per-endpoint static bodies

Detail: MultiStaticResourceCalloutMock.setStaticResource(endpoint, name)
Source: Static Resource Callout Mocks (opens in a new tab)

SOAP mock

Detail: WebServiceMock.doInvoke() puts response_x in the response map
Source: Test Web Service Callouts (opens in a new tab)

DML then mocked callout

Detail: startTest before setMock; DML outside the block
Source: DML and Mock Callouts (opens in a new tab)

Stub API can't mock

Detail: Static, private, properties, triggers, inner classes, system types, Batchable, private-only constructors
Source: Stub API (opens in a new tab)

@testSetup

Detail: One per class; static context reset before each test method
Source: Using Test Setup Methods (opens in a new tab)

SOSL in tests

Detail: Empty results unless Test.setFixedSearchResults()
Source: SOSL in Unit Tests (opens in a new tab)

Batch in tests

Detail: Only one execute call can be tested
Source: Use Batch Apex (opens in a new tab)

Change events in tests

Detail: enableChangeDataCapture() first; up to 500 events delivered
Source: Test Change Event Triggers (opens in a new tab)

runAs and called classes

Detail: Called method uses its own class's sharing mode
Source: Using the runAs Method (opens in a new tab)

Bulk trigger tests

Detail: At least 20 records
Source: Testing Best Practices (opens in a new tab)

Sources for this section (11)

Check yourself

Why does a test that inserts an Account before a mocked callout fail?
When does a stub from `Test.createStub()` actually run?
Why is a static variable assigned in `@testSetup` null in a test method?
What must a test call so SOSL returns a record it inserted?
When must `Test.enableChangeDataCapture()` be called?

The questions are free to read. Answers with their sources and self-grading are included with the pack.

Keep reading with the Platform Developer II pack

Core concepts
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All 28 lessons of the Platform Developer II guide, with reading progress
Interactive decision walks and step-by-step sequence steppers
Inline practice questions and one-click topic practice (15 questions for this lesson)
An official source cited for every claim
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What the exam expects

Key facts

Check yourself

Keep reading with the Platform Developer II pack

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