Number

Asserting Numbers

Assertions

All links point to https://pkg.go.dev/github.com/go-openapi/testify/v2

This domain exposes 7 functionalities. Generic assertions are marked with a .

InDelta

InDelta asserts that the two numerals are within delta of each other.

Delta must be greater than or equal to zero.

Expected and actual values should convert to float64. To compare large integers that can’t be represented accurately as float64 (e.g. uint64), prefer InDeltaT to preserve the original type.

Behavior with IEEE floating point arithmetic

expected NaN is matched only by a NaN, e.g. this works: [InDeltaT](math.Sqrt, math.Sqrt, 0.0)
expected +Inf is matched only by a +Inf
expected -Inf is matched only by a -Inf

Examples

	assertions.InDelta(t, math.Pi, 22/7.0, 0.01)
	success: 1.0, 1.01, 0.02
	failure: 1.0, 1.1, 0.05

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInDelta(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/assert"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInDelta(t *testing.T)
	success := assert.InDelta(t, 1.0, 1.01, 0.02)
	fmt.Printf("success: %t\n", success)

}

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInDelta(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/require"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInDelta(t *testing.T)
	require.InDelta(t, 1.0, 1.01, 0.02)
	fmt.Println("passed")

}

Signature	Usage
`assert.InDelta(t T, expected any, actual any, delta float64, msgAndArgs ...any) bool`	package-level function
`assert.InDeltaf(t T, expected any, actual any, delta float64, msg string, args ...any) bool`	formatted variant
`assert.(*Assertions).InDelta(expected any, actual any, delta float64) bool`	method variant
`assert.(*Assertions).InDeltaf(expected any, actual any, delta float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`require.InDelta(t T, expected any, actual any, delta float64, msgAndArgs ...any) bool`	package-level function
`require.InDeltaf(t T, expected any, actual any, delta float64, msg string, args ...any) bool`	formatted variant
`require.(*Assertions).InDelta(expected any, actual any, delta float64) bool`	method variant
`require.(*Assertions).InDeltaf(expected any, actual any, delta float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`assertions.InDelta(t T, expected any, actual any, delta float64, msgAndArgs ...any) bool`	internal implementation

Source: github.com/go-openapi/testify/v2/internal/assertions#InDelta

InDeltaMapValues

InDeltaMapValues is the same as InDelta, but it compares all values between two maps. Both maps must have exactly the same keys.

See InDelta.

Examples

	assertions.InDeltaMapValues(t, map[string](https://pkg.go.dev/github.com/go-openapi/testify/v2/assert#string)float64{"a": 1.0}, map[string](https://pkg.go.dev/github.com/go-openapi/testify/v2/assert#string)float64{"a": 1.01}, 0.02)
	success: map[string](https://pkg.go.dev/github.com/go-openapi/testify/v2/assert#string)float64{"a": 1.0}, map[string](https://pkg.go.dev/github.com/go-openapi/testify/v2/assert#string)float64{"a": 1.01}, 0.02
	failure: map[string](https://pkg.go.dev/github.com/go-openapi/testify/v2/assert#string)float64{"a": 1.0}, map[string](https://pkg.go.dev/github.com/go-openapi/testify/v2/assert#string)float64{"a": 1.1}, 0.05

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInDeltaMapValues(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/assert"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInDeltaMapValues(t *testing.T)
	success := assert.InDeltaMapValues(t, map[string]float64{"a": 1.0}, map[string]float64{"a": 1.01}, 0.02)
	fmt.Printf("success: %t\n", success)

}

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInDeltaMapValues(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/require"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInDeltaMapValues(t *testing.T)
	require.InDeltaMapValues(t, map[string]float64{"a": 1.0}, map[string]float64{"a": 1.01}, 0.02)
	fmt.Println("passed")

}

Signature	Usage
`assert.InDeltaMapValues(t T, expected any, actual any, delta float64, msgAndArgs ...any) bool`	package-level function
`assert.InDeltaMapValuesf(t T, expected any, actual any, delta float64, msg string, args ...any) bool`	formatted variant
`assert.(*Assertions).InDeltaMapValues(expected any, actual any, delta float64) bool`	method variant
`assert.(*Assertions).InDeltaMapValuesf(expected any, actual any, delta float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`require.InDeltaMapValues(t T, expected any, actual any, delta float64, msgAndArgs ...any) bool`	package-level function
`require.InDeltaMapValuesf(t T, expected any, actual any, delta float64, msg string, args ...any) bool`	formatted variant
`require.(*Assertions).InDeltaMapValues(expected any, actual any, delta float64) bool`	method variant
`require.(*Assertions).InDeltaMapValuesf(expected any, actual any, delta float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`assertions.InDeltaMapValues(t T, expected any, actual any, delta float64, msgAndArgs ...any) bool`	internal implementation

Source: github.com/go-openapi/testify/v2/internal/assertions#InDeltaMapValues

InDeltaSlice

InDeltaSlice is the same as InDelta, except it compares two slices.

See InDelta.

Examples

	assertions.InDeltaSlice(t, []float64{1.0, 2.0}, []float64{1.01, 2.01}, 0.02)
	success: []float64{1.0, 2.0}, []float64{1.01, 2.01}, 0.02
	failure: []float64{1.0, 2.0}, []float64{1.1, 2.1}, 0.05

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInDeltaSlice(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/assert"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInDeltaSlice(t *testing.T)
	success := assert.InDeltaSlice(t, []float64{1.0, 2.0}, []float64{1.01, 2.01}, 0.02)
	fmt.Printf("success: %t\n", success)

}

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInDeltaSlice(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/require"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInDeltaSlice(t *testing.T)
	require.InDeltaSlice(t, []float64{1.0, 2.0}, []float64{1.01, 2.01}, 0.02)
	fmt.Println("passed")

}

Signature	Usage
`assert.InDeltaSlice(t T, expected any, actual any, delta float64, msgAndArgs ...any) bool`	package-level function
`assert.InDeltaSlicef(t T, expected any, actual any, delta float64, msg string, args ...any) bool`	formatted variant
`assert.(*Assertions).InDeltaSlice(expected any, actual any, delta float64) bool`	method variant
`assert.(*Assertions).InDeltaSlicef(expected any, actual any, delta float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`require.InDeltaSlice(t T, expected any, actual any, delta float64, msgAndArgs ...any) bool`	package-level function
`require.InDeltaSlicef(t T, expected any, actual any, delta float64, msg string, args ...any) bool`	formatted variant
`require.(*Assertions).InDeltaSlice(expected any, actual any, delta float64) bool`	method variant
`require.(*Assertions).InDeltaSlicef(expected any, actual any, delta float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`assertions.InDeltaSlice(t T, expected any, actual any, delta float64, msgAndArgs ...any) bool`	internal implementation

Source: github.com/go-openapi/testify/v2/internal/assertions#InDeltaSlice

InDeltaT[Number Measurable]

InDeltaT asserts that the two numerals of the same type numerical type are within delta of each other.

InDeltaT accepts any go numeric type, including integer types.

The main difference with InDelta is that the delta is expressed with the same type as the values, not necessarily a float64.

Delta must be greater than or equal to zero.

Behavior with IEEE floating point arithmetic

expected NaN is matched only by a NaN, e.g. this works: InDeltaT(math.NaN, math.Sqrt, 0.0)
expected +Inf is matched only by a +Inf
expected -Inf is matched only by a -Inf

Examples

	assertions.InDeltaT(t, math.Pi, 22/7.0, 0.01)
	success: 1.0, 1.01, 0.02
	failure: 1.0, 1.1, 0.05

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInDeltaT(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/assert"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInDeltaT(t *testing.T)
	success := assert.InDeltaT(t, 1.0, 1.01, 0.02)
	fmt.Printf("success: %t\n", success)

}

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInDeltaT(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/require"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInDeltaT(t *testing.T)
	require.InDeltaT(t, 1.0, 1.01, 0.02)
	fmt.Println("passed")

}

Signature	Usage
`assert.InDeltaT[Number Measurable](t T, expected Number, actual Number, delta Number, msgAndArgs ...any) bool`	package-level function
`assert.InDeltaTf[Number Measurable](t T, expected Number, actual Number, delta Number, msg string, args ...any) bool`	formatted variant

Signature	Usage
`require.InDeltaT[Number Measurable](t T, expected Number, actual Number, delta Number, msgAndArgs ...any) bool`	package-level function
`require.InDeltaTf[Number Measurable](t T, expected Number, actual Number, delta Number, msg string, args ...any) bool`	formatted variant

Signature	Usage
`assertions.InDeltaT[Number Measurable](t T, expected Number, actual Number, delta Number, msgAndArgs ...any) bool`	internal implementation

Source: github.com/go-openapi/testify/v2/internal/assertions#InDeltaT

InEpsilon

InEpsilon asserts that expected and actual have a relative error less than epsilon.

Behavior with IEEE floating point arithmetic

expected NaN is matched only by a NaN, e.g. this works: [InDeltaT](math.NaN, math.Sqrt, 0.0)
expected +Inf is matched only by a +Inf
expected -Inf is matched only by a -Inf

Edge case: for very large integers that do not convert accurately to a float64 (e.g. uint64), prefer InDeltaT.

Formula:

If expected == 0: fail if |actual - expected| > epsilon
If expected != 0: fail if |actual - expected| > epsilon * |expected|

This allows InEpsilonT to work naturally across the full numeric range including zero.

Examples

	assertions.InEpsilon(t, 100.0, 101.0, 0.02)
	success: 100.0, 101.0, 0.02
	failure: 100.0, 110.0, 0.05

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInEpsilon(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/assert"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInEpsilon(t *testing.T)
	success := assert.InEpsilon(t, 100.0, 101.0, 0.02)
	fmt.Printf("success: %t\n", success)

}

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInEpsilon(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/require"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInEpsilon(t *testing.T)
	require.InEpsilon(t, 100.0, 101.0, 0.02)
	fmt.Println("passed")

}

Signature	Usage
`assert.InEpsilon(t T, expected any, actual any, epsilon float64, msgAndArgs ...any) bool`	package-level function
`assert.InEpsilonf(t T, expected any, actual any, epsilon float64, msg string, args ...any) bool`	formatted variant
`assert.(*Assertions).InEpsilon(expected any, actual any, epsilon float64) bool`	method variant
`assert.(*Assertions).InEpsilonf(expected any, actual any, epsilon float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`require.InEpsilon(t T, expected any, actual any, epsilon float64, msgAndArgs ...any) bool`	package-level function
`require.InEpsilonf(t T, expected any, actual any, epsilon float64, msg string, args ...any) bool`	formatted variant
`require.(*Assertions).InEpsilon(expected any, actual any, epsilon float64) bool`	method variant
`require.(*Assertions).InEpsilonf(expected any, actual any, epsilon float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`assertions.InEpsilon(t T, expected any, actual any, epsilon float64, msgAndArgs ...any) bool`	internal implementation

Source: github.com/go-openapi/testify/v2/internal/assertions#InEpsilon

InEpsilonSlice

InEpsilonSlice is the same as InEpsilon, except it compares each value from two slices.

See InEpsilon.

Examples

	assertions.InEpsilonSlice(t, []float64{100.0, 200.0}, []float64{101.0, 202.0}, 0.02)
	success: []float64{100.0, 200.0}, []float64{101.0, 202.0}, 0.02
	failure: []float64{100.0, 200.0}, []float64{110.0, 220.0}, 0.05

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInEpsilonSlice(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/assert"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInEpsilonSlice(t *testing.T)
	success := assert.InEpsilonSlice(t, []float64{100.0, 200.0}, []float64{101.0, 202.0}, 0.02)
	fmt.Printf("success: %t\n", success)

}

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInEpsilonSlice(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/require"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInEpsilonSlice(t *testing.T)
	require.InEpsilonSlice(t, []float64{100.0, 200.0}, []float64{101.0, 202.0}, 0.02)
	fmt.Println("passed")

}

Signature	Usage
`assert.InEpsilonSlice(t T, expected any, actual any, epsilon float64, msgAndArgs ...any) bool`	package-level function
`assert.InEpsilonSlicef(t T, expected any, actual any, epsilon float64, msg string, args ...any) bool`	formatted variant
`assert.(*Assertions).InEpsilonSlice(expected any, actual any, epsilon float64) bool`	method variant
`assert.(*Assertions).InEpsilonSlicef(expected any, actual any, epsilon float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`require.InEpsilonSlice(t T, expected any, actual any, epsilon float64, msgAndArgs ...any) bool`	package-level function
`require.InEpsilonSlicef(t T, expected any, actual any, epsilon float64, msg string, args ...any) bool`	formatted variant
`require.(*Assertions).InEpsilonSlice(expected any, actual any, epsilon float64) bool`	method variant
`require.(*Assertions).InEpsilonSlicef(expected any, actual any, epsilon float64, msg string, args ..any)`	method formatted variant

Signature	Usage
`assertions.InEpsilonSlice(t T, expected any, actual any, epsilon float64, msgAndArgs ...any) bool`	internal implementation

Source: github.com/go-openapi/testify/v2/internal/assertions#InEpsilonSlice

InEpsilonT[Number Measurable]

InEpsilonT asserts that expected and actual have a relative error less than epsilon.

When expected is zero, epsilon is interpreted as an absolute error threshold, since relative error is mathematically undefined for zero values.

Unlike InDeltaT, which preserves the original type, InEpsilonT converts the expected and actual numbers to float64, since the relative error doesn’t make sense as an integer.

Behavior with IEEE floating point arithmetic

expected NaN is matched only by a NaN, e.g. this works: [InDeltaT](math.NaN, math.Sqrt, 0.0)
expected +Inf is matched only by a +Inf
expected -Inf is matched only by a -Inf

Edge case: for very large integers that do not convert accurately to a float64 (e.g. uint64), prefer InDeltaT.

Formula:

If expected == 0: fail if |actual - expected| > epsilon
If expected != 0: fail if |actual - expected| > epsilon * |expected|

This allows InEpsilonT to work naturally across the full numeric range including zero.

Examples

	assertions.InEpsilon(t, 100.0, 101.0, 0.02)
	success: 100.0, 101.0, 0.02
	failure: 100.0, 110.0, 0.05

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInEpsilonT(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/assert"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInEpsilonT(t *testing.T)
	success := assert.InEpsilonT(t, 100.0, 101.0, 0.02)
	fmt.Printf("success: %t\n", success)

}

Copy and click to open Go Playground

// real-world test would inject *testing.T from TestInEpsilonT(t *testing.T)
package main

import (
	"fmt"
	"testing"

	"github.com/go-openapi/testify/v2/require"
)

func main() {
	t := new(testing.T) // should come from testing, e.g. func TestInEpsilonT(t *testing.T)
	require.InEpsilonT(t, 100.0, 101.0, 0.02)
	fmt.Println("passed")

}

Signature	Usage
`assert.InEpsilonT[Number Measurable](t T, expected Number, actual Number, epsilon float64, msgAndArgs ...any) bool`	package-level function
`assert.InEpsilonTf[Number Measurable](t T, expected Number, actual Number, epsilon float64, msg string, args ...any) bool`	formatted variant

Signature	Usage
`require.InEpsilonT[Number Measurable](t T, expected Number, actual Number, epsilon float64, msgAndArgs ...any) bool`	package-level function
`require.InEpsilonTf[Number Measurable](t T, expected Number, actual Number, epsilon float64, msg string, args ...any) bool`	formatted variant

Signature	Usage
`assertions.InEpsilonT[Number Measurable](t T, expected Number, actual Number, epsilon float64, msgAndArgs ...any) bool`	internal implementation

Source: github.com/go-openapi/testify/v2/internal/assertions#InEpsilonT

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