First tests for main program arguments validation

link_fixer.py

@@ -1,7 +1,39 @@
 import argparse
+import os
 from pathlib import Path
 import sys
 
+def link_fixer(ln_path, tgt_dir_path):
+    ln_is_dir = False
+
+    link = Path(ln_path)
+    tgt_dir = Path(tgt_dir_path)
+
+    if link.is_dir():
+        ln_is_dir = True
+    elif not link.is_symlink():
+        if not link.exists():
+            sys.exit("Link argument matches no file or directory")
+        else:
+            sys.exit("Link argument is not a symbolic link")
+    elif link.exists():
+        sys.exit("Link is not broken!")
+
+    if not tgt_dir.exists():
+        sys.exit("Target directory not found.")
+    if not tgt_dir.is_dir():
+        sys.exit("Pointed target is not a directory")
+
+    print("Starting link fixer")
+    if ln_is_dir:
+        print("Links dir: \t", link)
+    else:
+        print("Link: \t\t", link)
+    print("Targets dir: \t", tgt_dir)
+    if ln_is_dir:
+        sys.exit("But ln dir version not yet implemented. Sorry!")
+
+
 if __name__ == "__main__":
 
     parser = argparse.ArgumentParser(
@@ -18,24 +50,4 @@ if __name__ == "__main__":
     link = Path(args.link)
     tgt_dir = Path(args.tgt_path)
 
-    ln_is_dir = False
-
-    if not link.is_symlink():
-        sys.exit("Link not found or not a symbolic link")
-
-    if link.is_dir():
-        ln_is_dir = True
-
-    if not tgt_dir.exists():
-        sys.exit("Target directory not found.")
-    if not tgt_dir.is_dir():
-        sys.exit("Pointed target is not a directory")
-
-    print("Starting link fixer")
-    if ln_is_dir:
-        print("Links dir: \t", link)
-    else:
-        print("Link: \t\t", link)
-    print("Targets dir: \t", tgt_dir)
-    if ln_is_dir:
-        sys.exit("But ln dir version not yet implemented. Sorry!")
+    link_fixer(link, tgt_dir)

test/test_link_fixer.py

@@ -0,0 +1,73 @@
+from link_fixer import link_fixer
+import os
+from pathlib import Path
+import unittest
+
+class TestFixLinker(unittest.TestCase):
+
+    tgt_dir = Path("test/data/tgt_dir")
+    lnk_dir = Path("test/data/lnk_dir")
+    tgt_file = Path("test/data/tgt_dir/tgt_file.txt")
+    ln_non_exists = Path("test/data/link.txt")
+    ln_valid = Path("test/data/lnk_dir/ln_valid")
+    ln_valid_path = "../tgt_dir/tgt_file.txt"
+    ln_broken = Path("test/data/lnk_dir/tgt_file.txt")
+    ln_broken_path = "../tgt/tgt_.txt"
+    inexistent = Path("test/data/tgt_dir/inexistent.txt")
+
+    ln_ne_error = "Link argument matches no file or directory"
+    ln_gd_error = "Link is not broken!"
+    ln_ns_error = "Link argument is not a symbolic link"
+
+
+    def reset_dir(self, dir_path):
+        if not dir_path.is_dir():
+            if dir_path.exists():
+                dir_path.unlink()
+            os.mkdir(dir_path)
+        return
+    
+    def reset_file(self, file_path):
+        if not file_path.is_file():
+            if file_path.exists():
+                filepath.unlink()
+            open(file_path, 'a').close()
+
+    def setup_test(self):
+
+        self.reset_dir(self.tgt_dir)
+        self.reset_dir(self.lnk_dir)
+        self.reset_file(self.tgt_file)
+        self.reset_file(self.inexistent)
+        
+        
+        if self.ln_valid.exists() or self.ln_valid.is_symlink():
+            self.ln_valid.unlink()
+        self.ln_valid.symlink_to(self.ln_valid_path)
+        
+        if self.ln_broken.exists() or self.ln_broken.is_symlink():
+            self.ln_broken.unlink()
+        self.ln_broken.symlink_to(self.ln_broken_path)
+        self.inexistent.unlink()
+
+
+    def test_link_fixer(self):
+        self.setup_test()
+        
+        print("Test for inexistent link")
+        with self.assertRaises(SystemExit) as err:
+            link_fixer(self.ln_non_exists, self.tgt_dir)
+        self.assertEqual(err.exception.code, self.ln_ne_error)
+
+        print("Test for non-broken link")
+        with self.assertRaises(SystemExit) as err:
+            link_fixer(self.ln_valid, self.tgt_dir)
+        self.assertEqual(err.exception.code, self.ln_gd_error)
+
+        print("Test for non-link link")
+        with self.assertRaises(SystemExit) as err:
+            link_fixer(self.tgt_file, self.tgt_dir)
+        self.assertEqual(err.exception.code, self.ln_ns_error)
+
+if __name__ == "__main__":
+    unittest.main()