hash_test.go

package sha1

import (
	"crypto/sha1"
	"fmt"
	"math/rand"
	"reflect"
	"testing"
)

// TestHash tests the correctness of the Sum function.
func TestHash(t *testing.T) {
	// Define a list of test cases, including empty string, common phrases, and randomly generated strings:
	tests := []string{
		"",
		"Hello World!",
		"Distributed Lab",
		"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.",
	}

	// Generate additional test cases by generating random strings of varying lengths:
	for i := 0; i < 10000; i++ {
		length := rand.Intn(20000)
		tests = append(tests, randSeq(length))
	}
	for _, tt := range tests {
		t.Run(fmt.Sprintf("Hash %s\n", tt), func(t *testing.T) {
			// Compute the expected hash using the standard crypto/sha1 package:
			want := sha1.Sum([]byte(tt))

			// Compute the hash using the Sum function from this package:
			got := Sum([]byte(tt))

			// Compare the computed hash (got) to the expected hash (want)
			if !reflect.DeepEqual(got, want[:]) {
				t.Errorf("Hash() = %v, want %v", got, want)
			}
		})
	}
}