Add a test for a bugfix in UrlQuerySanitizer

...so this does not happen again.
This is a test for the fix in Ic91660d974dce21f2affdcacaeffe9accf8451ac

Bug: 1866121
Test: This
Change-Id: Ib7ee866f65baf99b46a31e2115355a42a829421e
diff --git a/tests/cts/net/src/android/net/cts/UrlQuerySanitizerTest.java b/tests/cts/net/src/android/net/cts/UrlQuerySanitizerTest.java
index 7076ea2..2d615bb 100644
--- a/tests/cts/net/src/android/net/cts/UrlQuerySanitizerTest.java
+++ b/tests/cts/net/src/android/net/cts/UrlQuerySanitizerTest.java
@@ -170,6 +170,12 @@
         String initialPercentSign = "title=%B5";
         assertEquals(expectedPlus, uqs.unescape(initialPlus));
         assertEquals(expectedPercentSignHex, uqs.unescape(initialPercentSign));
+        String expectedPlusThenPercentSign = "Joe Random, User";
+        String plusThenPercentSign = "Joe+Random%2C%20User";
+        assertEquals(expectedPlusThenPercentSign, uqs.unescape(plusThenPercentSign));
+        String expectedPercentSignThenPlus = "Joe, Random User";
+        String percentSignThenPlus = "Joe%2C+Random+User";
+        assertEquals(expectedPercentSignThenPlus, uqs.unescape(percentSignThenPlus));
 
         assertTrue(uqs.decodeHexDigit('0') >= 0);
         assertTrue(uqs.decodeHexDigit('b') >= 0);