Move test .txt files to a testdata directory

experimental/collator/src/lib.rs

@@ -1105,7 +1105,7 @@ mod tests {
     #[test]
     fn test_th_dictionary() {
         // Adapted from `CollationThaiTest::TestDictionary` of thcoll.cpp in ICU4C.
-        let dict = include_str!("riwords.txt")
+        let dict = include_str!("../testdata/riwords.txt")
             .strip_prefix('\u{FEFF}')
             .unwrap();
         let locale: Locale = langid!("th").into();
@@ -1614,7 +1614,7 @@ mod tests {
     fn test_conformance_shifted() {
         // Adapted from `UCAConformanceTest::TestTableShifted` of ucaconf.cpp in ICU4C.
         let bugs = [];
-        let dict = include_bytes!("CollationTest_CLDR_SHIFTED.txt");
+        let dict = include_bytes!("../testdata/CollationTest_CLDR_SHIFTED.txt");
         let data_provider = icu_testdata::get_provider();
 
         let mut options = CollatorOptions::new();
@@ -1659,7 +1659,7 @@ mod tests {
     fn test_conformance_non_ignorable() {
         // Adapted from `UCAConformanceTest::TestTableNonIgnorable` of ucaconf.cpp in ICU4C.
         let bugs = [];
-        let dict = include_bytes!("CollationTest_CLDR_NON_IGNORABLE.txt");
+        let dict = include_bytes!("../testdata/CollationTest_CLDR_NON_IGNORABLE.txt");
         let data_provider = icu_testdata::get_provider();
 
         let mut options = CollatorOptions::new();