Add more tests to DefaultClientRequestObservationConvention

Closes gh-31125

spring-web/src/test/java/org/springframework/http/client/observation/DefaultClientRequestObservationConventionTests.java

@@ -20,10 +20,12 @@ package org.springframework.http.client.observation;
 import java.io.IOException;
 
 import io.micrometer.common.KeyValue;
+import io.micrometer.common.KeyValues;
 import io.micrometer.observation.Observation;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatusCode;
 import org.springframework.http.client.ClientHttpRequest;
 import org.springframework.http.client.ClientHttpResponse;
 import org.springframework.web.testfixture.http.client.MockClientHttpRequest;
@@ -42,6 +44,8 @@ class DefaultClientRequestObservationConventionTests {
 
 	private final MockClientHttpRequest request = new MockClientHttpRequest(HttpMethod.GET, "/test");
 
+	private final static MockClientHttpResponse response = new MockClientHttpResponse();
+
 	private final DefaultClientRequestObservationConvention observationConvention = new DefaultClientRequestObservationConvention();
 
 	@Test
@@ -65,7 +69,7 @@ class DefaultClientRequestObservationConventionTests {
 	@Test
 	void addsKeyValuesForRequestWithUriTemplate() {
 		ClientRequestObservationContext context = createContext(
-				new MockClientHttpRequest(HttpMethod.GET, "/resource/{id}", 42), new MockClientHttpResponse());
+				new MockClientHttpRequest(HttpMethod.GET, "/resource/{id}", 42), response);
 		context.setUriTemplate("/resource/{id}");
 		assertThat(this.observationConvention.getLowCardinalityKeyValues(context))
 				.contains(KeyValue.of("exception", "none"), KeyValue.of("method", "GET"), KeyValue.of("uri", "/resource/{id}"),
@@ -76,7 +80,7 @@ class DefaultClientRequestObservationConventionTests {
 	@Test
 	void addsKeyValuesForRequestWithUriTemplateWithHost() {
 		ClientRequestObservationContext context = createContext(
-				new MockClientHttpRequest(HttpMethod.GET, "https://example.org/resource/{id}", 42), new MockClientHttpResponse());
+				new MockClientHttpRequest(HttpMethod.GET, "https://example.org/resource/{id}", 42), response);
 		context.setUriTemplate("https://example.org/resource/{id}");
 		assertThat(this.observationConvention.getLowCardinalityKeyValues(context))
 				.contains(KeyValue.of("exception", "none"), KeyValue.of("method", "GET"), KeyValue.of("uri", "/resource/{id}"),
@@ -88,7 +92,7 @@ class DefaultClientRequestObservationConventionTests {
 	@Test
 	void addsKeyValuesForRequestWithoutUriTemplate() {
 		ClientRequestObservationContext context = createContext(
-				new MockClientHttpRequest(HttpMethod.GET, "/resource/42"), new MockClientHttpResponse());
+				new MockClientHttpRequest(HttpMethod.GET, "/resource/42"), response);
 		assertThat(this.observationConvention.getLowCardinalityKeyValues(context))
 				.contains(KeyValue.of("method", "GET"), KeyValue.of("client.name", "none"), KeyValue.of("uri", "none"));
 		assertThat(this.observationConvention.getHighCardinalityKeyValues(context)).contains(KeyValue.of("http.url", "/resource/42"));
@@ -98,19 +102,60 @@ class DefaultClientRequestObservationConventionTests {
 	void addsClientNameForRequestWithHost() {
 		ClientRequestObservationContext context = createContext(
 				new MockClientHttpRequest(HttpMethod.GET, "https://localhost:8080/resource/42"),
-				new MockClientHttpResponse());
+				response);
 		assertThat(this.observationConvention.getLowCardinalityKeyValues(context)).contains(KeyValue.of("client.name", "localhost"));
 	}
 
 	@Test
 	void addsKeyValueForNonResolvableStatus() throws Exception {
-		ClientRequestObservationContext context = new ClientRequestObservationContext(this.request);
 		ClientHttpResponse response = mock();
-		context.setResponse(response);
+		ClientRequestObservationContext context = createContext(this.request, response);
 		given(response.getStatusCode()).willThrow(new IOException("test error"));
 		assertThat(this.observationConvention.getLowCardinalityKeyValues(context)).contains(KeyValue.of("status", "IO_ERROR"));
 	}
 
+	@Test
+	void addKeyValueForNon200Response() {
+		MockClientHttpResponse response = new MockClientHttpResponse(new byte[0], HttpStatusCode.valueOf(400));
+		ClientRequestObservationContext context = createContext(request, response);
+		KeyValues lowCardinality = this.observationConvention.getLowCardinalityKeyValues(context);
+		assertThat(lowCardinality).contains(KeyValue.of("status", "400"));
+	}
+
+	@Test
+	void addKeyValuesForUnknownStatusResponse() {
+		MockClientHttpResponse response = new MockClientHttpResponse(new byte[0], 512);
+		ClientRequestObservationContext context = createContext(request, response);
+		KeyValues lowCardinalityKeyValues = this.observationConvention.getLowCardinalityKeyValues(context);
+		assertThat(lowCardinalityKeyValues).contains(KeyValue.of("status", "512"), KeyValue.of("outcome", "UNKNOWN"));
+	}
+
+	@Test
+	void addKeyValuesForRequestNull() {
+		ClientRequestObservationContext context = createContext(null, response);
+		KeyValues highCardinality = this.observationConvention.getHighCardinalityKeyValues(context);
+		assertThat(highCardinality).contains(KeyValue.of("http.url", "none"));
+		KeyValues lowCardinality = this.observationConvention.getLowCardinalityKeyValues(context);
+		assertThat(lowCardinality).contains(KeyValue.of("method", "none"), KeyValue.of("exception", "none"),
+				KeyValue.of("client.name", "none"), KeyValue.of("uri", "none")
+		);
+	}
+
+	@Test
+	void addKeyValueForResponseNull() {
+		ClientRequestObservationContext context = createContext(this.request, null);
+		KeyValues lowCardinality = this.observationConvention.getLowCardinalityKeyValues(context);
+		assertThat(lowCardinality).contains(KeyValue.of("status", "CLIENT_ERROR"));
+	}
+
+	@Test
+	void addKeyValueForContextError() {
+		ClientRequestObservationContext context = createContext(this.request, response);
+		context.setError(new RuntimeException("error"));
+		KeyValues lowCardinality = this.observationConvention.getLowCardinalityKeyValues(context);
+		assertThat(lowCardinality).contains(KeyValue.of("exception", "RuntimeException"));
+	}
+
 	private ClientRequestObservationContext createContext(ClientHttpRequest request, ClientHttpResponse response) {
 		ClientRequestObservationContext context = new ClientRequestObservationContext(request);
 		context.setResponse(response);