diff --git a/src/block_ffm.rs b/src/block_ffm.rs
index ae34e7e8..fab305ae 100644
--- a/src/block_ffm.rs
+++ b/src/block_ffm.rs
@@ -1937,7 +1937,7 @@ mod tests {
             contra_field_index: mi.ffm_k,
         }]);
         assert_eq!(spredict2(&mut bg, &fb, &mut pb), 0.5);
-        assert_eq!(slearn2(&mut bg, &fb, &mut pb, true), 0.5);
+        assert_eq!(slearn2(&mut bg, &fb, &mut pb, true), 0.62245935);
     }
 
     #[test]
diff --git a/src/main.rs b/src/main.rs
index 4555bbc1..a6fd27d2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -50,7 +50,7 @@ fn main() {
 
 fn create_buffered_input(input_filename: &str) -> Box<dyn BufRead> {
     // Handler for different (or no) compression types
-    
+
     let input = File::open(input_filename).expect("Could not open the input file.");
 
     let input_format = Path::new(&input_filename)
@@ -322,3 +322,105 @@ fn main_fw_loop() -> Result<(), Box<dyn Error>> {
 
     Ok(())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use flate2::write::GzEncoder;
+    use flate2::Compression;
+    use std::fs::File;
+    use std::io::{self, BufReader, Read, Write};
+    use tempfile::Builder as TempFileBuilder;
+    use tempfile::NamedTempFile;
+    use zstd::stream::Encoder as ZstdEncoder;
+
+    fn create_temp_file_with_contents(
+        extension: &str,
+        contents: &[u8],
+    ) -> io::Result<NamedTempFile> {
+        let temp_file = TempFileBuilder::new()
+            .suffix(&format!(".{}", extension))
+            .tempfile()?;
+        temp_file.as_file().write_all(contents)?;
+        Ok(temp_file)
+    }
+
+    fn create_gzipped_temp_file(contents: &[u8]) -> io::Result<NamedTempFile> {
+        let temp_file = TempFileBuilder::new().suffix(".gz").tempfile()?;
+        let gz = GzEncoder::new(Vec::new(), Compression::default());
+        let mut gz_writer = io::BufWriter::new(gz);
+        gz_writer.write_all(contents)?;
+        let gz = gz_writer.into_inner()?.finish()?;
+        temp_file.as_file().write_all(&gz)?;
+        Ok(temp_file)
+    }
+
+    fn create_zstd_temp_file(contents: &[u8]) -> io::Result<NamedTempFile> {
+        let temp_file = TempFileBuilder::new().suffix(".zst").tempfile()?;
+        let mut zstd_encoder = ZstdEncoder::new(Vec::new(), 1)?;
+        zstd_encoder.write_all(contents)?;
+        let encoded_data = zstd_encoder.finish()?;
+        temp_file.as_file().write_all(&encoded_data)?;
+        Ok(temp_file)
+    }
+
+    // Test for uncompressed file ("vw" extension)
+    #[test]
+    fn test_uncompressed_file() {
+        let contents = b"Sample text for uncompressed file.";
+        let temp_file =
+            create_temp_file_with_contents("vw", contents).expect("Failed to create temp file");
+        let mut reader = create_buffered_input(temp_file.path().to_str().unwrap());
+
+        let mut buffer = Vec::new();
+        reader
+            .read_to_end(&mut buffer)
+            .expect("Failed to read from the reader");
+        assert_eq!(
+            buffer, contents,
+            "Contents did not match for uncompressed file."
+        );
+    }
+
+    // Test for gzipped files ("gz" extension)
+    #[test]
+    fn test_gz_compressed_file() {
+        let contents = b"Sample text for gzipped file.";
+        let temp_file =
+            create_gzipped_temp_file(contents).expect("Failed to create gzipped temp file");
+        let mut reader = create_buffered_input(temp_file.path().to_str().unwrap());
+
+        let mut buffer = Vec::new();
+        reader
+            .read_to_end(&mut buffer)
+            .expect("Failed to read from the reader");
+        assert_eq!(buffer, contents, "Contents did not match for gzipped file.");
+    }
+
+    // Test for zstd compressed files ("zst" extension)
+    #[test]
+    fn test_zstd_compressed_file() {
+        let contents = b"Sample text for zstd compressed file.";
+        let temp_file = create_zstd_temp_file(contents).expect("Failed to create zstd temp file");
+        let mut reader = create_buffered_input(temp_file.path().to_str().unwrap());
+
+        let mut buffer = Vec::new();
+        reader
+            .read_to_end(&mut buffer)
+            .expect("Failed to read from the reader");
+        assert_eq!(
+            buffer, contents,
+            "Contents did not match for zstd compressed file."
+        );
+    }
+
+    // Test for unsupported file format
+    #[test]
+    #[should_panic(expected = "Please specify a valid input format (.vw, .zst, .gz)")]
+    fn test_unsupported_file_format() {
+        let contents = b"Some content";
+        let temp_file =
+            create_temp_file_with_contents("txt", contents).expect("Failed to create temp file");
+        let _reader = create_buffered_input(temp_file.path().to_str().unwrap());
+    }
+}