Assert Class

Signature

public static void areEqual(Object expected, Object actual, String msg)

Parameters

expected

Type: Object

Expected value.

actual

Type: Object

Actual value.

msg

Type: String

(Optional) Custom message returned as part of the error message.

Return Value

Type: void

Usage

If the first two arguments aren't the same, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

String sub = 'abcde'.substring(2);
Assert.areEqual('cde', sub, 'Expected characters after first two'); // Succeeds

Signature

public static void areEqual(Object expected, Object actual)

Parameters

expected

Type: Object

Expected value.

actual

Type: Object

Actual value.

Return Value

Type: void

Usage

If the two arguments aren't the same, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

String sub = 'abcde'.substring(2);
Assert.areEqual('cde', sub); // Succeeds

Signature

public static void areNotEqual(Object notExpected, Object actual, String msg)

Parameters

notExpected

Type: Object

Value that’s not expected.

actual

Type: Object

Actual value.

msg

Type: String

(Optional) Custom message returned as part of the error message.

Return Value

Type: void

Usage

If the first two arguments are the same, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

String sub = 'abcde'.substring(2);
Assert.areNotEqual('xyz', sub, 'Characters not expected after first two'); // Succeeds

Signature

public static void areNotEqual(Object notExpected, Object actual)

Parameters

notExpected

Type: Object

Value that’s not expected.

actual

Type: Object

Actual value.

Return Value

Type: void

Usage

If the two arguments are the same, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

String sub = 'abcde'.substring(2);
Assert.areNotEqual('xyz', sub); // Succeeds

Signature

public static void fail(String msg)

Parameters

msg

Type: String

(Optional) Custom message returned as part of the error message.

Return Value

Type: void

Usage

Commonly used in a try/catch block test case where an exception is expected to be thrown. You can’t, however, catch the assertion failure in the try/catch block even though it’s logged as an exception.

Example

// test case where exception is expected
try {
    SomeClass.methodUnderTest();
    Assert.fail('DmlException Expected');
} catch (DmlException ex) {
    // Add assertions here about the expected exception
}

Signature

public static void fail()

Return Value

Type: void

Usage

Commonly used in a try/catch block test case where an exception is expected to be thrown. You can’t, however, catch the assertion failure in the try/catch block even though it’s logged as an exception.

Example

// test case where exception is expected
try {
    SomeClass.methodUnderTest();
    Assert.fail(); 
} catch (DmlException ex) {
    // Add assertions here about the expected exception
}

Signature

public static void isFalse(Boolean condition, String msg)

Parameters

condition

Type: Boolean

Condition you’re checking to determine if it’s false.

msg

Type: String

(Optional) Custom message returned as part of the error message.

Return Value

Type: void

Usage

If the condition is true, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

Boolean containsCode = 'Salesforce'.contains('code');
Assert.isFalse(containsCode, 'No code'); // Assertion succeeds

Signature

public static void isFalse(Boolean condition)

Parameters

condition

Type: Boolean

Condition you’re checking to determine if it’s false.

Return Value

Type: void

Usage

If the condition is true, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

Boolean containsCode = 'Salesforce'.contains('code');
Assert.isFalse(containsCode); // Assertion succeeds

Signature

public static void isInstanceOfType(Object instance, System.Type expectedType, String msg)

Parameters

instance

Type: Object

Instance whose type you're checking.

expectedType

Type: System.Type

Expected type.

msg

Type: String

(Optional) Custom message returned as part of the error message.

Return Value

Type: void

Usage

If the instance isn't of the specified type, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

Account o = new Account();
Assert.isInstanceOfType(o, Account.class); // Succeeds

Signature

public static void isInstanceOfType(Object instance, System.Type expectedType)

Parameters

instance

Type: Object

Instance whose type you're checking.

expectedType

Type: System.Type

Expected type.

Return Value

Type: void

Usage

If the instance isn't of the specified type, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

Account o = new Account();
Assert.isInstanceOfType(o, Account.class); // Succeeds

Account o = new Account();
Assert.isInstanceOfType(o, Account.class, 'Expected type.'); // Succeeds

Signature

public static void isNotInstanceOfType(Object instance, System.Type notExpectedType, String msg)

Parameters

instance

Type: Object

Instance whose type you're checking.

notExpectedType

Type: System.Type

Type that's not expected.

msg

Type: String

(Optional) Custom message returned as part of the error message.

Return Value

Type: void

Usage

If the instance is of the specified type, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

Contact con = new Contact();
Assert.isNotInstanceOfType(con, Account.class, 'Not expected type'); // Succeeds

Signature

public static void isNotInstanceOfType(Object instance, System.Type notExpectedType)

Parameters

instance

Type: Object

Instance whose type you're checking.

notExpectedType

Type: System.Type

Type that's not expected.

Return Value

Type: void

Usage

If the instance is of the specified type, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

Contact con = new Contact();
Assert.isNotInstanceOfType(con, Account.class); // Succeeds

Signature

public static void isNotNull(Object value, String msg)

Parameters

value

Type: Object

Value you’re checking to determine if it’s not null.

msg

Type: String

(Optional) Custom message returned as part of the error message.

Return Value

Type: void

Usage

If the value is null, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

String myString = 'value'; 
Assert.isNotNull(myString, 'myString should not be null'); // Succeeds

Signature

public static void isNotNull(Object value)

Parameters

value

Type: Object

Value you’re checking to determine if it’s not null.

Return Value

Type: void

Usage

If the value is null, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

String myString = 'value'; 
Assert.isNotNull(myString); // Succeeds

Signature

public static void isNull(Object value, String msg)

Parameters

value

Type: Object

Value you’re checking to determine if it’s null.

msg

Type: String

(Optional) Custom message returned as part of the error message.

Return Value

Type: void

Usage

If the value isn't null, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

String myString = null; 
Assert.isNull(myString, 'String should be null'); // Succeeds

Signature

public static void isNull(Object value)

Parameters

value

Type: Object

Value you’re checking to determine if it’s null.

Return Value

Type: void

Usage

If the value isn't null, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

String myString = null; 
Assert.isNull(myString); // Succeeds

Signature

public static void isTrue(Boolean condition, String msg)

Parameters

condition

Type: Boolean

Condition you’re checking to determine if it’s true.

msg

Type: String

(Optional) Custom message returned as part of the error message.

Return Value

Type: void

Usage

If the specified condition is false, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

Boolean containsForce = 'Salesforce'.contains('force');
Assert.isTrue(containsForce, 'Contains force'); // Assertion succeeds

Signature

public static void isTrue(Boolean condition)

Parameters

condition

Type: Boolean

Condition you’re checking to determine if it’s true.

Return Value

Type: void

Usage

If the specified condition is false, a fatal error is returned that causes code execution to halt.

You can’t catch an assertion failure using a try/catch block even though it’s logged as an exception.

Example

Boolean containsForce = 'Salesforce'.contains('force');
Assert.isTrue(containsForce); // Assertion succeeds