ext/iconv/tests/bug48147.phpt: rename and repurpose

This test ensures that iconv() with //IGNORE will return part of the
translated string when it is given invalid inputs. POSIX and the PHP
documentation however agree that an error should be returned in that
case: the test is making sure that we get the wrong answer.

PHP's iconv has recently been updated to agree with the standard and
docs. As a result, this test fails, but that's OK -- it should. The
history of iconv in PHP is convoluted, so rather than just update the
expected output here, I think it's best to rename the test and sever
its ties to bug 48147. Referencing that bug at this point can only
cause confusion.

Author: orlitzky

ext/iconv/tests/bug48147.phpt

@@ -0,0 +1,42 @@
+--TEST--
+iconv with //IGNORE should not ignore invalid input sequences
+--EXTENSIONS--
+iconv
+--SKIPIF--
+<?php
+// POSIX 2024 standardizes "//IGNORE", but some implementations (like musl)
+// do not support it yet. If iconv() doesn't understand "//IGNORE", the
+// tests below will still fail, but you'll get an error message about
+// finding an unexpected string in your encoding name rather than the
+// expected illegal-sequence error.
+if (ICONV_IMPL == "unknown") {
+    die("skip iconv implementation may not understand //IGNORE");
+}
+?>
+--FILE--
+<?php
+$text = "aa\xC3\xC3\xC3\xB8aa";
+var_dump(iconv("UTF-8", "UTF-8", $text));
+var_dump(iconv("UTF-8", "UTF-8//IGNORE", $text));
+// only invalid
+var_dump(iconv("UTF-8", "UTF-8//IGNORE", "\xC3"));
+// start invalid
+var_dump(iconv("UTF-8", "UTF-8//IGNORE", "\xC3\xC3\xC3\xB8aa"));
+// finish invalid
+var_dump(iconv("UTF-8", "UTF-8//IGNORE", "aa\xC3\xC3\xC3"));
+?>
+--EXPECTF--
+Notice: iconv(): Detected an illegal character in input string in %s on line %d
+bool(false)
+
+Notice: iconv(): Detected an illegal character in input string in %s on line %d
+bool(false)
+
+Notice: iconv(): Detected an incomplete multibyte character in input string in %s on line %d
+bool(false)
+
+Notice: iconv(): Detected an illegal character in input string in %s on line %d
+bool(false)
+
+Notice: iconv(): Detected an incomplete multibyte character in input string in %s on line %d
+bool(false)