add constructor with BufferedReader in StandardInputSupplier

Author: fmbenhassine

src/main/java/io/github/benas/unixstream/StandardInputSupplier.java

@@ -2,11 +2,8 @@
 
 import java.io.BufferedReader;
 import java.io.IOException;
-import java.io.InputStreamReader;
 import java.util.function.Supplier;
 
-import static java.lang.System.in;
-
 /**
  * Supplier that generates an infinite stream from the standard input.
  *
@@ -16,8 +13,8 @@ class StandardInputSupplier implements Supplier<String> {
 
     private BufferedReader bufferedReader;
 
-    StandardInputSupplier() {
-        bufferedReader = new BufferedReader(new InputStreamReader(in));
+    StandardInputSupplier(BufferedReader bufferedReader) {
+        this.bufferedReader = bufferedReader;
     }
 
     @Override

src/main/java/io/github/benas/unixstream/UnixStream.java

@@ -12,6 +12,7 @@
 import java.util.function.Predicate;
 import java.util.stream.Stream;
 
+import static java.lang.System.in;
 import static java.nio.file.Files.isDirectory;
 import static java.nio.file.Files.lines;
 import static java.nio.file.Files.walk;
@@ -36,7 +37,7 @@ public interface UnixStream<T> extends Stream<T> {
      * @throws IOException thrown if an error occurs during reading the standard input
      */
     static UnixStream<String> cat() throws IOException {
-        return new UnixStreamImpl<>(Stream.generate(new StandardInputSupplier()));
+        return new UnixStreamImpl<>(Stream.generate(new StandardInputSupplier(new BufferedReader(new InputStreamReader(in)))));
     }
 
     /**