Adding Test Case for Additional Encoding Scenarios (#2556)

This change adds a number of additional expression expansion options
that are run through UriUtils.encode to validate we are pct-encoding
as RFC6570 defines

core/src/test/java/feign/template/UriUtilsTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 The Feign Authors
+ * Copyright 2012-2024 The Feign 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
@@ -14,9 +14,15 @@
 package feign.template;
 
 
+import feign.Param;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import java.nio.charset.StandardCharsets;
+import java.util.stream.Stream;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.assertj.core.api.Assertions.assertThat;
-import org.junit.jupiter.api.Test;
 
 class UriUtilsTest {
 
@@ -41,4 +47,26 @@ void pctEncodeWithReservedCharacters() {
     String encoded = UriUtils.encode(withReserved, UTF_8, true);
     assertThat(encoded).isEqualTo("/api/user@host:port#section[a-z]/data");
   }
+
+  @ParameterizedTest
+  @MethodSource("provideValuesToEncode")
+  void testVariousEncodingScenarios(String input, String expected) {
+    assertThat(UriUtils.encode(input, UTF_8)).isEqualTo(expected);
+  }
+
+  private static Stream<Arguments> provideValuesToEncode() {
+    return Stream.of(
+        Arguments.of("foo", "foo"),
+        Arguments.of("foo bar", "foo%20bar"),
+        Arguments.of("foo%20bar", "foo%20bar"),
+        Arguments.of("foo%2520bar", "foo%2520bar"),
+        Arguments.of("foo&bar", "foo%26bar"),
+        Arguments.of("foo& bar", "foo%26%20bar"),
+        Arguments.of("foo = bar", "foo%20%3D%20bar"),
+        Arguments.of("foo   ", "foo%20%20%20"),
+        Arguments.of("foo/bar", "foo%2Fbar"),
+        Arguments.of("foo!\"/$%?&   *( )  _%20^¨  >`:É.   ',.  é ;`^ ¸< nasty stuff here!",
+            "foo%21%22%2F%24%25%3F%26%20%20%20%2A%28%20%29%20%20_%2520%5E%C2%A8%20%20%3E%60%3A%C3%89.%20%20%20%27%2C.%20%20%C3%A9%20%3B%60%5E%20%C2%B8%3C%20nasty%20stuff%20here%21"));
+
+  }
 }