loader logic revised

client/loader/util_test.go

@@ -0,0 +1,56 @@
+package loader
+
+import (
+	"crypto/sha256"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestSumSHA256 verifies that SumSHA256 returns the same digest
+// as the standard library implementation for a non-empty payload.
+func TestSumSHA256(t *testing.T) {
+	t.Parallel()
+
+	data := []byte("hello world")
+	expected := sha256.Sum256(data)
+
+	actual := SumSHA256(data)
+
+	require.Equal(t, expected, actual)
+}
+
+// TestSumSHA256Empty verifies that SumSHA256 correctly handles
+// an empty byte slice.
+func TestSumSHA256Empty(t *testing.T) {
+	t.Parallel()
+
+	data := []byte{}
+	expected := sha256.Sum256(data)
+
+	actual := SumSHA256(data)
+
+	require.Equal(t, expected, actual)
+}
+
+// TestEqualSHA256Same verifies that two identical digests
+// are considered equal.
+func TestEqualSHA256Same(t *testing.T) {
+	t.Parallel()
+
+	data := []byte("hello")
+	digest := sha256.Sum256(data)
+
+	require.True(t, EqualSHA256(digest, digest))
+}
+
+// TestEqualSHA256Different verifies that different digests
+// are considered not equal.
+func TestEqualSHA256Different(t *testing.T) {
+	t.Parallel()
+
+	digestA := sha256.Sum256([]byte("hello"))
+	digestB := sha256.Sum256([]byte("world"))
+
+	require.False(t, EqualSHA256(digestA, digestB))
+}