fix pwd to return the absolute path of the working directory

Author: fmbenhassine

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

@@ -134,7 +134,7 @@ static UnixStream<Path> ls(final Path directory) throws IOException {
      * @return a new UnixStream with the absolute path of the current directory.
      */
     static UnixStream<Path> pwd() {
-        return new UnixStreamImpl<>(Stream.of(Paths.get("")));
+        return new UnixStreamImpl<>(Stream.of(Paths.get("").toAbsolutePath()));
     }
 
 

src/test/java/io/github/benas/unixstream/components/PwdTest.java

@@ -18,8 +18,7 @@ public void pwd() throws IOException {
 
         List<Path> paths = stream.collect(Collectors.toList());
 
-        // TODO toAbsolutePath should not be be called by the client
-        assertThat(paths.get(0).toAbsolutePath().toString()).endsWith("unix-stream");
+        assertThat(paths.get(0).toString()).endsWith("unix-stream");
     }
 
 }