github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/crypto/sha256/fallback_test.go (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build s390x
     6  // +build s390x
     7  
     8  package sha256
     9  
    10  import (
    11  	"fmt"
    12  	"io"
    13  	"testing"
    14  )
    15  
    16  // Tests the fallback code path in case the optimized asm
    17  // implementation cannot be used.
    18  // See also TestBlockGeneric.
    19  func TestGenericPath(t *testing.T) {
    20  	if useAsm == false {
    21  		t.Skipf("assembly implementation unavailable")
    22  	}
    23  	useAsm = false
    24  	defer func() { useAsm = true }()
    25  	c := New()
    26  	in := "ΑΒΓΔΕϜΖΗΘΙΚΛΜΝΞΟΠϺϘΡΣΤΥΦΧΨΩ"
    27  	gold := "e93d84ec2b22383123be9f713697fb25" +
    28  		"338c86e2f7d8d1ddc2d89d332dd9d76c"
    29  	if _, err := io.WriteString(c, in); err != nil {
    30  		t.Fatalf("could not write to c: %v", err)
    31  	}
    32  	out := fmt.Sprintf("%x", c.Sum(nil))
    33  	if out != gold {
    34  		t.Fatalf("mismatch: got %s, wanted %s", out, gold)
    35  	}
    36  }