Added tests for server.* attribute extraction

Author: JonasKunz

exporters/common/src/test/java/io/opentelemetry/exporter/internal/ServerAttributesUtilTest.java

@@ -0,0 +1,59 @@
+package io.opentelemetry.exporter.internal;
+
+import io.opentelemetry.sdk.internal.SemConvAttributes;
+import org.junit.jupiter.api.Test;
+
+import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.assertThat;
+
+public class ServerAttributesUtilTest {
+
+  @Test
+  public void invalidUrl() {
+    assertThat(ServerAttributesUtil.extractServerAttributes("^"))
+        .isEmpty();
+  }
+
+  @Test
+  public void emptyUrl() {
+    assertThat(ServerAttributesUtil.extractServerAttributes(""))
+        .isEmpty();
+  }
+
+  @Test
+  public void testHttps() {
+    assertThat(ServerAttributesUtil.extractServerAttributes("https://example.com/foo/bar?a=b"))
+        .hasSize(2)
+        .containsEntry(SemConvAttributes.SERVER_ADDRESS, "example.com")
+        .containsEntry(SemConvAttributes.SERVER_PORT, 443);
+
+    assertThat(ServerAttributesUtil.extractServerAttributes("https://example.com:1234/foo/bar?a=b"))
+        .hasSize(2)
+        .containsEntry(SemConvAttributes.SERVER_ADDRESS, "example.com")
+        .containsEntry(SemConvAttributes.SERVER_PORT, 1234);
+  }
+
+  @Test
+  public void testHttp() {
+    assertThat(ServerAttributesUtil.extractServerAttributes("http://example.com/foo/bar?a=b"))
+        .hasSize(2)
+        .containsEntry(SemConvAttributes.SERVER_ADDRESS, "example.com")
+        .containsEntry(SemConvAttributes.SERVER_PORT, 80);
+
+    assertThat(ServerAttributesUtil.extractServerAttributes("http://example.com:1234/foo/bar?a=b"))
+        .hasSize(2)
+        .containsEntry(SemConvAttributes.SERVER_ADDRESS, "example.com")
+        .containsEntry(SemConvAttributes.SERVER_PORT, 1234);
+  }
+
+  @Test
+  public void unknownScheme() {
+    assertThat(ServerAttributesUtil.extractServerAttributes("custom://foo"))
+        .hasSize(1)
+        .containsEntry(SemConvAttributes.SERVER_ADDRESS, "foo");
+
+    assertThat(ServerAttributesUtil.extractServerAttributes("custom://foo:1234"))
+        .hasSize(2)
+        .containsEntry(SemConvAttributes.SERVER_ADDRESS, "foo")
+        .containsEntry(SemConvAttributes.SERVER_PORT, 1234);
+  }
+}