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

1String sub = 'abcde'.substring(2);
2Assert.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

1String sub = 'abcde'.substring(2);
2Assert.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

1String sub = 'abcde'.substring(2);
2Assert.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

1String sub = 'abcde'.substring(2);
2Assert.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

1// test case where exception is expected
2try {
3    SomeClass.methodUnderTest();
4    Assert.fail('DmlException Expected');
5} catch (DmlException ex) {
6    // Add assertions here about the expected exception
7}

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

1// test case where exception is expected
2try {
3    SomeClass.methodUnderTest();
4    Assert.fail(); 
5} catch (DmlException ex) {
6    // Add assertions here about the expected exception
7}

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

1Boolean containsCode = 'Salesforce'.contains('code');
2Assert.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

1Boolean containsCode = 'Salesforce'.contains('code');
2Assert.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

1Account o = new Account();
2Assert.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

1Account o = new Account();
2Assert.isInstanceOfType(o, Account.class); // Succeeds

1Account o = new Account();
2Assert.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

1Contact con = new Contact();
2Assert.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

1Contact con = new Contact();
2Assert.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

1String myString = 'value'; 
2Assert.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

1String myString = 'value'; 
2Assert.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

1String myString = null; 
2Assert.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

1String myString = null; 
2Assert.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

1Boolean containsForce = 'Salesforce'.contains('force');
2Assert.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

1Boolean containsForce = 'Salesforce'.contains('force');
2Assert.isTrue(containsForce); // Assertion succeeds