org.assertj.core.api

Interface FloatingPointNumberAssert<SELF extends FloatingPointNumberAssert<SELF,ACTUAL>,ACTUAL extends Number>

Type Parameters:

SELF - the "self" type of this assertion class. Please read "Emulating 'self types' using Java Generics to simplify fluent API implementation" for more details.

ACTUAL - the type of the "actual" value.

All Superinterfaces:

NumberAssert<SELF,ACTUAL>

All Known Implementing Classes:

AbstractDoubleAssert, AbstractFloatAssert, DoubleAssert, FloatAssert

public interface FloatingPointNumberAssert<SELF extends FloatingPointNumberAssert<SELF,ACTUAL>,ACTUAL extends Number>
extends NumberAssert<SELF,ACTUAL>

Assertion methods applicable to floating-point Numbers.

Author:

Alex Ruiz, Yvonne Wang, Mikhail Mazursky

Method Summary

Methods

Modifier and Type	Method and Description
SELF	isCloseTo(ACTUAL expected, Offset<ACTUAL> offset) Verifies that the actual number is close to the given one within the given offset. If difference is equal to offset value, assertion is considered valid.
SELF	isEqualTo(ACTUAL expected, Offset<ACTUAL> offset) Verifies that the actual number is close to the given one within the given offset value.
SELF	isNaN() Verifies that the actual value is equal to NaN.
SELF	isNotCloseTo(ACTUAL expected, Offset<ACTUAL> offset) Verifies that the actual number is not close to the given one by less than the given offset. If the difference is equal to the offset value, the assertion fails.
SELF	isNotNaN() Verifies that the actual value is not equal to NaN.

Methods inherited from interface org.assertj.core.api.NumberAssert

isBetween, isCloseTo, isNegative, isNotCloseTo, isNotNegative, isNotPositive, isNotZero, isOne, isPositive, isStrictlyBetween, isZero

Method Detail

isEqualTo

SELF isEqualTo(ACTUAL expected,
             Offset<ACTUAL> offset)

Verifies that the actual number is close to the given one within the given offset value.

This assertion is the same as isCloseTo(Number, Offset).

When abs(actual - expected) == offset value, the assertion:

• succeeds when using Assertions.within(Double) or Assertions.offset(Double)
• fails when using Assertions.byLessThan(Double) or Offset.strictOffset(Number)

Examples:

 // assertions will pass
 assertThat(8.1).isEqualTo(8.0, within(0.2));
 assertThat(8.1).isEqualTo(8.0, offset(0.2)); // alias of within 
 assertThat(8.1).isEqualTo(8.0, byLessThan(0.2)); // strict

 // assertions succeed when the difference == offset value ...  
 assertThat(8.1).isEqualTo(8.0, within(0.1));
 assertThat(8.1).isEqualTo(8.0, offset(0.1));
 // ... except when using byLessThan which is strict
 assertThat(8.1).isEqualTo(8.0, byLessThan(0.1)); // strict => fail
 
 // this assertions also fails
 assertThat(8.1).isEqualTo(8.0, within(0.001));

Parameters:

expected - the given value to compare the actual value to.

offset - the given positive offset.

Returns:

this assertion object.

Throws:

NullPointerException - if the given offset is null.

NullPointerException - if the expected number is null.

AssertionError - if the actual value is not equal to the given one.

isCloseTo

SELF isCloseTo(ACTUAL expected,
             Offset<ACTUAL> offset)

Verifies that the actual number is close to the given one within the given offset.
If difference is equal to offset value, assertion is considered valid.

Example with double:

 // assertions will pass:
 assertThat(8.1).isCloseTo(new Double(8.0), within(0.2));

 // you can use offset if you prefer
 assertThat(8.1).isCloseTo(new Double(8.0), offset(0.2));

 // if difference is exactly equals to the offset (0.1), it's ok
 assertThat(8.1).isCloseTo(new Double(8.0), within(0.1));

 // assertion will fail
 assertThat(8.1).isCloseTo(new Double(8.0), within(0.01));

Specified by:

isCloseTo in interface NumberAssert<SELF extends FloatingPointNumberAssert<SELF,ACTUAL>,ACTUAL extends Number>

Parameters:

expected - the given number to compare the actual value to.

offset - the given positive offset.

Returns:

this assertion object.

Throws:

NullPointerException - if the given offset is null.

NullPointerException - if the expected number is null.

AssertionError - if the actual value is not close to the given one.

isNotCloseTo

SELF isNotCloseTo(ACTUAL expected,
                Offset<ACTUAL> offset)

Verifies that the actual number is not close to the given one by less than the given offset.
If the difference is equal to the offset value, the assertion fails.

Example with double:

 // assertions will pass:
 assertThat(8.3).isNotCloseTo(new Double(8.0), byLessThan(0.2));

 // you can use offset if you prefer
 assertThat(8.3).isNotCloseTo(new Double(8.0), offset(0.2));

 // assertions will fail
 assertThat(8.1).isNotCloseTo(new Double(8.0), byLessThan(0.1));
 assertThat(8.1).isNotCloseTo(new Double(8.0), byLessThan(0.2));

Specified by:

isNotCloseTo in interface NumberAssert<SELF extends FloatingPointNumberAssert<SELF,ACTUAL>,ACTUAL extends Number>

Parameters:

expected - the given number to compare the actual value to.

offset - the given positive offset.

Returns:

this assertion object.

Throws:

NullPointerException - if the given offset is null.

NullPointerException - if the expected number is null.

AssertionError - if the actual value is equal to the given one.

Since:

2.6.0 / 3.6.0

See Also:

Assertions.byLessThan(Double)

isNaN

SELF isNaN()

Verifies that the actual value is equal to NaN.

Example:

 // assertions will pass
 assertThat(Double.NaN).isNaN();
 assertThat(0.0 / 0.0).isNaN();
 assertThat(0.0F * Float.POSITIVE_INFINITY).isNaN();
 
 // assertions will fail
 assertThat(1.0).isNaN();
 assertThat(-1.0F).isNaN();

Returns:

this assertion object.

Throws:

AssertionError - if the actual value is not equal to NaN.

isNotNaN

SELF isNotNaN()

Verifies that the actual value is not equal to NaN.

Example:

 // assertions will pass
 assertThat(1.0).isNotNaN();
 assertThat(-1.0F).isNotNaN();
 
 // assertions will fail
 assertThat(Double.NaN).isNotNaN();
 assertThat(0.0 / 0.0).isNotNaN();
 assertThat(0.0F * Float.POSITIVE_INFINITY).isNotNaN();

Returns:

this assertion object.

Throws:

AssertionError - if the actual value is equal to NaN.