assert.IsIncreasing can return false without failing the test

[brackendawson]

go.dev/play

package main

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func Test(t *testing.T) {
	if !assert.IsIncreasing(t, 0) {
		t.Log("assertion is false, test should fail")
	}
}

yields

=== RUN   Test
    prog_test.go:11: assertion is false, test should fail
--- PASS: Test (0.00s)
PASS

#1124 would fix this.

[dolmen]

@brackendawson Could you just cherry pick the first commit of #1124 as a separate MR?

Because review of the sort.Interface changes will require more time.

[brackendawson]

Superseded by #1787