config: Add fuzz tests

Author: pellared

.github/workflows/ci.yml

@@ -67,6 +67,25 @@ jobs:
     - name: Run tests with race detector
       run: make test-race
 
+  test-fuzz:
+    strategy:
+      matrix:
+        target:
+          - fuzz-config-json
+          - fuzz-config-yaml
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout Repo
+      uses: actions/checkout@v4
+    - name: Install Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: ${{ env.DEFAULT_GO_VERSION }}
+        check-latest: true
+        cache-dependency-path: "**/go.sum"
+    - name: Fuzzing
+      run: make ${{ matrix.target }}
+
   test-coverage:
     runs-on: ubuntu-latest
     steps:

Makefile

@@ -14,6 +14,7 @@ CONTRIB_REPO_URL = https://github.com/open-telemetry/opentelemetry-go-contrib/tr
 
 GO = go
 TIMEOUT = 60
+FUZZTIME = 180
 
 .DEFAULT_GOAL := precommit
 
@@ -276,6 +277,18 @@ test-coverage/%:
 		&& $$CMD ./... \
 		&& $(GO) tool cover -html=coverage.out -o coverage.html;
 
+# Fuzzing
+
+.PHONY: fuzz-config-json
+fuzz-config-json:
+	cd config/v0.3.0 \
+	&& $(GO) test -run=^$ -fuzztime=$(FUZZTIME) -fuzz=FuzzJSON
+
+.PHONY: fuzz-config-yaml
+fuzz-config-yaml:
+	cd config/v0.3.0 \
+	&& $(GO) test -run=^$ -fuzztime=$(FUZZTIME) -fuzz=FuzzYAML
+
 # Releasing
 
 .PHONY: gorelease

config/v0.3.0/fuzz_test.go

@@ -0,0 +1,53 @@
+package config
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"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) {
+		var cfg OpenTelemetryConfiguration
+		err := json.Unmarshal(b, &cfg)
+		if err != nil {
+			return
+		}
+
+		sdk, err := NewSDK(WithOpenTelemetryConfiguration(cfg))
+		if err != nil {
+			return
+		}
+
+		assert.NoError(t, sdk.Shutdown(context.Background()))
+	})
+}
+
+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) {
+		cfg, err := ParseYAML(data)
+		if err != nil {
+			return
+		}
+
+		sdk, err := NewSDK(WithOpenTelemetryConfiguration(*cfg))
+		if err != nil {
+			return
+		}
+
+		assert.NoError(t, sdk.Shutdown(context.Background()))
+	})
+}