Improved log and log test.

tests/text/test_log.py

@@ -1,17 +1,30 @@
 #!/usr/bin/python3
 
+import pytest
 from wobbl_tools.text.log import Log
 
 print("\n==== wobbl_tools.text.log =====")
 
 test_log = Log("test_log.txt")
+test_log.clear()
 
 test_log.write("Testing the log module...")
 test_log.write("This should be fine...", "ok")
 test_log.write("Something happened...", "warning")
 test_log.write("Oh shit!", "error")
 
-
 print("Logfile contents:")
 print(test_log.read())
 
+expected_content = \
+    "[info]: Testing the log module...\n" \
+    "[OK]: This should be fine...\n" \
+    "[WARNING]: Something happened...\n" \
+    "[ERROR]: Oh shit!\n"
+
+assert test_log.read() == expected_content
+
+without_file = Log()
+
+with pytest.raises(FileNotFoundError, match="You didn't specify a log path at the log instance definition."):
+    without_file.read()