Add more tests to OpenTelemetryResourceAttributesTests

Add tests for decoding percent-encoded strings with non-ASCII characters
and multi-byte sequences.

See gh-44944

Signed-off-by: Dmytro Nosan <[email protected]>

Author: nosan

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/opentelemetry/OpenTelemetryResourceAttributesTests.java

@@ -117,6 +117,22 @@ void otelResourceAttributeValuesShouldBePercentDecoded() {
 			.containsEntry("key", value);
 	}
 
+	@Test
+	void otelResourceAttributeValuesShouldBePercentDecodedWhenStringContainsNonAscii() {
+		this.environmentVariables.put("OTEL_RESOURCE_ATTRIBUTES", "key=%20\u015bp\u0159\u00ec\u0144\u0121%20");
+		assertThat(getAttributes()).hasSize(2)
+			.containsEntry("service.name", "unknown_service")
+			.containsEntry("key", " śpřìńġ ");
+	}
+
+	@Test
+	void otelResourceAttributeValuesShouldBePercentDecodedWhenMultiByteSequences() {
+		this.environmentVariables.put("OTEL_RESOURCE_ATTRIBUTES", "key=T%C5%8Dky%C5%8D");
+		assertThat(getAttributes()).hasSize(2)
+			.containsEntry("service.name", "unknown_service")
+			.containsEntry("key", "Tōkyō");
+	}
+
 	@Test
 	void illegalArgumentExceptionShouldBeThrownWhenDecodingIllegalHexCharPercentEncodedValue() {
 		this.environmentVariables.put("OTEL_RESOURCE_ATTRIBUTES", "key=abc%ß");