diff --git a/src/text_normalization.rs b/src/text_normalization.rs
index 0978b47..f55e313 100644
--- a/src/text_normalization.rs
+++ b/src/text_normalization.rs
@@ -1,8 +1,121 @@
 use crate::kana_transliteration::{
+    transliterate_fullwidth_romaji_to_halfwidth_romaji,
     transliterate_halfwidth_katakana_to_fullwidth_katakana, transliterate_katakana_to_hiragana,
 };
 
 pub fn normalize_japanese_text(text: &str) -> String {
     let text = transliterate_halfwidth_katakana_to_fullwidth_katakana(text);
-    transliterate_katakana_to_hiragana(&text)
+    let text = transliterate_katakana_to_hiragana(&text);
+    let text = transliterate_fullwidth_romaji_to_halfwidth_romaji(&text);
+    text
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_normalize_jp_katakana_to_hiragana() {
+        let input = "カタカナ";
+        let expected = "かたかな";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[test]
+    fn test_normalize_jp_mixed_katakana_and_hiragana() {
+        let input = "カタカナとひらがな";
+        let expected = "かたかなとひらがな";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[test]
+    fn test_normalize_jp_halfwidth_katakana_to_hiragana() {
+        let input = "ｶﾀｶﾅ";
+        let expected = "かたかな";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[test]
+    fn test_normalize_jp_replaces_long_vowel_dash() {
+        let input = "コーヒー";
+        let expected = "こおひい";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[test]
+    fn test_normalize_jp_replaces_multiple_long_vowel_dashes() {
+        let input = "コーーヒーー";
+        let expected = "こおおひいい";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[ignore = "FIX ME"]
+    #[test]
+    fn test_normalize_jp_replaces_iteration_mark_kanji() {
+        let input = "佐々木";
+        let expected = "佐佐木";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[ignore = "FIX ME"]
+    #[test]
+    fn test_normalize_jp_replaces_iteration_mark_hiragana() {
+        let input = "さゝき";
+        let expected = "ささき";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[ignore = "FIX ME"]
+    #[test]
+    fn test_normalize_jp_replaces_iteration_mark_hiragana_dakuten() {
+        let input = "さゞき";
+        let expected = "さざき";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[ignore = "FIX ME"]
+    #[test]
+    fn test_normalize_jp_replaces_iteration_mark_katakana() {
+        let input = "サゝキ";
+        let expected = "ササキ";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[ignore = "FIX ME"]
+    #[test]
+    fn test_normalize_jp_replaces_iteration_mark_katakana_dakuten() {
+        let input = "サゞキ";
+        let expected = "サザキ";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[test]
+    fn test_normalize_jp_normalizes_fullwidth_digits() {
+        let input = "１２３４５６７８９０";
+        let expected = "1234567890";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[test]
+    fn test_normalize_jp_normalizes_fullwidth_romaji() {
+        let input = "ＡＢＣＤＥＦＧＨＩＪＫＬＭＮＯＰＱＲＳＴＵＶＷＸＹＺａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚ";
+        let expected = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[ignore = "FIX ME"]
+    #[test]
+    fn test_normalize_jp_hiragana_yori() {
+        let input = "ゟ";
+        let expected = "より";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
+
+    #[ignore = "FIX ME"]
+    #[test]
+    fn test_normalize_jp_katakana_koto() {
+        let input = "ヿ";
+        let expected = "こと";
+        assert_eq!(normalize_japanese_text(input), expected);
+    }
 }