The extension format accessor tests

Signed-off-by: Fabio José <fabiojose@gmail.com>

api/src/test/java/io/cloudevents/v02/AccessorTest.java

@@ -0,0 +1,134 @@
+/**
+ * Copyright 2019 The CloudEvents Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.cloudevents.v02;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.net.URI;
+import java.util.Collection;
+
+import org.junit.Test;
+
+import io.cloudevents.extensions.DistributedTracingExtension;
+import io.cloudevents.extensions.ExtensionFormat;
+import io.cloudevents.extensions.InMemoryFormat;
+
+/**
+ * 
+ * @author fabiojose
+ *
+ */
+public class AccessorTest {
+
+	@Test
+	public void should_empty_collection_when_no_extensions() {
+		// setup	
+		CloudEventImpl<Object> ce = 
+				CloudEventBuilder.<Object>builder()
+					.withId("x10")
+					.withSource(URI.create("/source"))
+					.withType("event-type")
+					.withSchemaurl(URI.create("/schema"))
+					.withContenttype("text/plain")
+					.withData("my-data")
+					.build();
+		
+		// act
+		Collection<ExtensionFormat> actual = Accessor.extensionsOf(ce);
+		
+		// assert
+		assertTrue(actual.isEmpty());
+	}
+	
+	@Test
+	public void should_return_the_tracing_extension() {
+		// setup 
+		final DistributedTracingExtension dt = new DistributedTracingExtension();
+		dt.setTraceparent("0");
+		dt.setTracestate("congo=4");
+		
+		final ExtensionFormat expected = new DistributedTracingExtension.Format(dt);
+		
+		CloudEventImpl<Object> ce = 
+				CloudEventBuilder.<Object>builder()
+					.withId("x10")
+					.withSource(URI.create("/source"))
+					.withType("event-type")
+					.withSchemaurl(URI.create("/schema"))
+					.withContenttype("text/plain")
+					.withData("my-data")
+					.withExtension(expected)
+					.build();
+		
+		// act
+		Collection<ExtensionFormat> extensions = 
+				Accessor.extensionsOf(ce);
+		
+		// assert
+		assertFalse(extensions.isEmpty());
+		ExtensionFormat actual = extensions.iterator().next();
+		
+		assertEquals("0", actual.transport().get("traceparent"));
+		assertEquals("congo=4", actual.transport().get("tracestate"));
+		
+		assertEquals("0", 
+				((DistributedTracingExtension)actual.memory().getValue()).getTraceparent());
+		
+		assertEquals("congo=4", 
+				((DistributedTracingExtension)actual.memory().getValue()).getTracestate());
+	}
+	
+	@Test
+	public void should_return_the_custom_extension() {
+		// setup
+		String customExt = "comexampleextension1";
+		String customVal = "my-ext-val";
+		InMemoryFormat inMemory = 
+			InMemoryFormat.of(customExt, customVal, String.class);
+		
+		ExtensionFormat expected = 
+			ExtensionFormat.of(inMemory, customExt, customVal);
+		
+		CloudEventImpl<Object> ce = 
+				CloudEventBuilder.<Object>builder()
+					.withId("x10")
+					.withSource(URI.create("/source"))
+					.withType("event-type")
+					.withSchemaurl(URI.create("/schema"))
+					.withContenttype("text/plain")
+					.withData("my-data")
+					.withExtension(expected)
+					.build();
+		
+		// act
+		Collection<ExtensionFormat> extensions = 
+				Accessor.extensionsOf(ce);
+		
+		// assert
+		assertFalse(extensions.isEmpty());
+		ExtensionFormat actual = extensions.iterator().next();
+		
+		assertEquals(customVal, actual.transport().get(customExt));
+		
+		assertEquals(String.class, actual.memory().getValueType());
+		
+		assertEquals(customExt, actual.memory().getKey());
+		
+		assertEquals(customVal, actual.memory().getValue());
+	}
+}