diff --git a/src/format.rs b/src/format.rs
index 9f32bbe..38470f0 100644
--- a/src/format.rs
+++ b/src/format.rs
@@ -217,7 +217,7 @@ impl Format {
 ///
 /// The number is assumed to be base-10 by default, it is parsed as a different
 /// [Format](format::Format) if the number is prefixed with the [prefix](format::FormatOptions::prefix),
-/// case insensitive. So if the user inputs `0b1100` then this is parsed as
+/// case sensitive. So if the user inputs `0b1100` then this is parsed as
 /// [Binary](format::Format::Bin) and so on.
 ///
 /// # Example
diff --git a/tests/format.rs b/tests/format.rs
index 62e18fb..476bd4a 100644
--- a/tests/format.rs
+++ b/tests/format.rs
@@ -198,3 +198,35 @@ fn set_format_checker() {
     options.set_format(Format::Base64);
     assert_eq!(options.format(), Format::Base64);
 }
+
+#[test]
+fn parser_dec() {
+    assert_eq!(numf_parser("1337").unwrap(), 1337);
+    assert_eq!(numf_parser("0d1337").unwrap(), 1337);
+}
+
+#[test]
+fn parser_bin() {
+    assert_eq!(numf_parser("0b11001").unwrap(), 0b11001);
+    assert_eq!(numf_parser("0b11001").unwrap(), 0b11001);
+}
+
+#[test]
+fn parser_hex() {
+    assert_eq!(numf_parser("0xdeadbeef").unwrap(), 0xdeadbeef);
+}
+
+#[test]
+fn parser_oct() {
+    assert_eq!(numf_parser("0o771171").unwrap(), 0o771171);
+}
+
+#[test]
+fn parser_b64() {
+    assert_eq!(numf_parser("0sQUFCQg==").unwrap(), 0x41414242);
+}
+
+#[test]
+fn parser_b32() {
+    assert_eq!(numf_parser("IFAUEQQ=").unwrap(), 0x41414242);
+}