loader logic revised

pkg/connector/connector_test.go

@@ -0,0 +1,89 @@
+package connector
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestSHA256DigestMarshalJSON verifies that the digest is encoded
+// as a lowercase hexadecimal JSON string.
+func TestSHA256DigestMarshalJSON(t *testing.T) {
+	t.Parallel()
+
+	digest := NewSHA256Digest([]byte("hello world"))
+
+	data, err := json.Marshal(digest)
+	require.NoError(t, err)
+
+	require.Equal(t, `"b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"`, string(data))
+}
+
+// TestSHA256DigestUnmarshalJSON verifies that a valid hexadecimal JSON string
+// is decoded back into the original digest.
+func TestSHA256DigestUnmarshalJSON(t *testing.T) {
+	t.Parallel()
+
+	var digest SHA256Digest
+	err := json.Unmarshal(
+		[]byte(`"b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"`),
+		&digest,
+	)
+	require.NoError(t, err)
+
+	expected := NewSHA256Digest([]byte("hello world"))
+	require.True(t, digest.Equal(expected))
+}
+
+// TestSHA256DigestUnmarshalJSONInvalidLength verifies that invalid digest length
+// is rejected.
+func TestSHA256DigestUnmarshalJSONInvalidLength(t *testing.T) {
+	t.Parallel()
+
+	var digest SHA256Digest
+	err := json.Unmarshal([]byte(`"abcd"`), &digest)
+
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "invalid SHA-256 hex length")
+}
+
+// TestSHA256DigestUnmarshalJSONInvalidHex verifies that non-hexadecimal input
+// is rejected.
+func TestSHA256DigestUnmarshalJSONInvalidHex(t *testing.T) {
+	t.Parallel()
+
+	var digest SHA256Digest
+	err := json.Unmarshal(
+		[]byte(`"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"`),
+		&digest,
+	)
+
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "invalid SHA-256 hex value")
+}
+
+// TestFileMetadataJSONRoundTrip verifies that a struct containing the digest
+// round-trips correctly through JSON.
+func TestFileMetadataJSONRoundTrip(t *testing.T) {
+	t.Parallel()
+
+	original := VersionInfo{
+		OS:       "linux",
+		Version:  "1.2.3",
+		URL:      "http://server:8080",
+		Checksum: NewSHA256Digest([]byte("payload")),
+	}
+
+	data, err := json.Marshal(original)
+	require.NoError(t, err)
+
+	var decoded VersionInfo
+	err = json.Unmarshal(data, &decoded)
+	require.NoError(t, err)
+
+	require.Equal(t, original.OS, decoded.OS)
+	require.Equal(t, original.Version, decoded.Version)
+	require.Equal(t, original.URL, decoded.URL)
+	require.True(t, original.Checksum.Equal(decoded.Checksum))
+}