Add some simplistic fuzz-based tests for the 2 built-in W3C propagators. (#1926)

* Add some simplistic fuzz-based tests for the 2 built-in propagators.

* remove unused gradle plugin

api/build.gradle

@@ -15,6 +15,8 @@ dependencies {
     annotationProcessor libraries.auto_value
 
     signature "net.sf.androidscents.signature:android-api-level-24:7.0_r2@signature"
+
+    testImplementation libraries.jqf
 }
 
 javadoc {

api/src/test/java/io/opentelemetry/api/baggage/propagation/W3CBaggagePropagatorFuzzTest.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.api.baggage.propagation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.google.common.collect.ImmutableMap;
+import edu.berkeley.cs.jqf.fuzz.Fuzz;
+import edu.berkeley.cs.jqf.fuzz.JQF;
+import io.opentelemetry.context.Context;
+import java.util.Map;
+import org.junit.runner.RunWith;
+
+@RunWith(JQF.class)
+@SuppressWarnings("JavadocMethod")
+public class W3CBaggagePropagatorFuzzTest {
+  private final W3CBaggagePropagator baggagePropagator = W3CBaggagePropagator.getInstance();
+
+  @Fuzz
+  public void safeForRandomInputs(String baggage) {
+    Context context =
+        baggagePropagator.extract(Context.root(), ImmutableMap.of("baggage", baggage), Map::get);
+    assertThat(context).isNotNull();
+  }
+}

api/src/test/java/io/opentelemetry/api/trace/propagation/HttpTraceContextFuzzTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.api.trace.propagation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.google.common.collect.ImmutableMap;
+import edu.berkeley.cs.jqf.fuzz.Fuzz;
+import edu.berkeley.cs.jqf.fuzz.JQF;
+import io.opentelemetry.context.Context;
+import java.util.Map;
+import org.junit.runner.RunWith;
+
+@RunWith(JQF.class)
+@SuppressWarnings("JavadocMethod")
+public class HttpTraceContextFuzzTest {
+  private final HttpTraceContext httpTraceContext = HttpTraceContext.getInstance();
+
+  @Fuzz
+  public void safeForRandomInputs(String traceParentHeader, String traceStateHeader) {
+    Context context =
+        httpTraceContext.extract(
+            Context.root(),
+            ImmutableMap.of("traceparent", traceParentHeader, "tracestate", traceStateHeader),
+            Map::get);
+    assertThat(context).isNotNull();
+  }
+}

build.gradle

@@ -332,7 +332,8 @@ configure(opentelemetryProjects) {
                 rest_assured            : 'io.rest-assured:rest-assured:4.2.0',
                 jaeger_client           : 'io.jaegertracing:jaeger-client:1.2.0', // Jaeger Client
                 zipkin_junit            : "io.zipkin.zipkin2:zipkin-junit:${zipkinVersion}",  // Zipkin JUnit rule
-                archunit                : 'com.tngtech.archunit:archunit-junit4:0.13.1' //Architectural constraints
+                archunit                : 'com.tngtech.archunit:archunit-junit4:0.13.1', //Architectural constraints
+                jqf                     : 'edu.berkeley.cs.jqf:jqf-fuzz:1.6' // fuzz testing
         ]
     }