config: Add fuzz tests (#6604)

Co-authored-by: Tyler Yahn <[email protected]>

Author: pellared

config/v0.3.0/fuzz_test.go

@@ -0,0 +1,64 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package config
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func FuzzJSON(f *testing.F) {
+	b, err := os.ReadFile(filepath.Join("..", "testdata", "v0.3.json"))
+	require.NoError(f, err)
+	f.Add(b)
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		t.Log("JSON:\n" + string(data))
+
+		var cfg OpenTelemetryConfiguration
+		err := json.Unmarshal(b, &cfg)
+		if err != nil {
+			return
+		}
+
+		sdk, err := NewSDK(WithOpenTelemetryConfiguration(cfg))
+		if err != nil {
+			return
+		}
+
+		ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
+		defer cancel()
+		_ = sdk.Shutdown(ctx)
+	})
+}
+
+func FuzzYAML(f *testing.F) {
+	b, err := os.ReadFile(filepath.Join("..", "testdata", "v0.3.yaml"))
+	require.NoError(f, err)
+	f.Add(b)
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		t.Log("YAML:\n" + string(data))
+
+		cfg, err := ParseYAML(data)
+		if err != nil {
+			return
+		}
+
+		sdk, err := NewSDK(WithOpenTelemetryConfiguration(*cfg))
+		if err != nil {
+			return
+		}
+
+		ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
+		defer cancel()
+		_ = sdk.Shutdown(ctx)
+	})
+}