Added unit tests for pstree

hw4/task1/src/pstree.rs

 use self::libc::pid_t;
 
 /// Datenstruktur für einen Prozess.
-struct Process {
+pub struct Process {
     name : String,
     pid : pid_t,
     ppid : pid_t,
 impl Process {
 
     /// Erstellt eine Prozess-Datenstruktur aus procinfo::Stat.
-    fn new(with_pid:pid_t) -> Self {
+    pub fn new(with_pid:pid_t) -> Self {
         if let Ok(stat) = pid::stat(with_pid) {
             Process{name: stat.command, pid:stat.pid, ppid:stat.ppid}
         } else {
     }
 
     /// Prüft ob das Prozess-Struct ein Elternprozess besitzt.
-    fn has_parent(&self) -> bool {
+    pub fn has_parent(&self) -> bool {
         self.ppid != 0
     }
 
     /// Gibt den Elternprozess zurück.
-    fn parent(&self) -> Self {
+    pub fn parent(&self) -> Self {
         Process::new(self.ppid)
     }
 
     /// Prüft ob das Prozess-Struct einen (entfernten) Elternprozess mit dem übergebenen pid hat.
-    fn has_parent_with_pid(&self, pid: pid_t) -> bool {
+    pub fn has_parent_with_pid(&self, pid: pid_t) -> bool {
         if self.pid == pid {
             return true
         }
     }
 
     /// Gibt über Rekursion über die Eltern eine Prozesskette aus.
-    fn print_recursive(&self, to_pid:pid_t, output: &mut String) {
+    pub fn print_recursive(&self, to_pid:pid_t, output: &mut String) {
 
         if output.len() == 0 {
             *output = format!("{}({}){}", self.name, self.pid, output);

hw4/task1/src/unit_test_pstree.rs

 #[cfg(test)]
 mod tests {
+    use pstree::Process;
+
     #[test]
-    fn invalid_pid() {
-        assert_eq!()
+    #[should_panic]
+    fn new_invalid_pid() {
+        Process::new(-1000);
+    }
+
+    #[test]
+    fn new_valid_pid() {
+        Process::new(1);
+    }
+
+    #[test]
+    fn hasparent_no() {
+        assert_eq!(false, Process::has_parent(&Process::new(1)));
+    }
+
+    #[test]
+    fn hasparent_yes() {
+
+    }
+
+    #[test]
+    #[should_panic]
+    fn parent_not_existing() {
+        Process::parent(&Process::new(1));
     }
 }