Added doc and test for signalgenerator FromFile

b_asic/GUI/signal_generator_input.py

@@ -103,6 +103,11 @@ class ZeroPadInput(SignalGeneratorInput):
 
 
 class FromFileInput(SignalGeneratorInput):
+    """
+    Class for graphically configuring and generating a
+    :class:`~b_asic.signal_generators.FromFile` signal generator.
+    """
+
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.file_label = QLabel("Browse")

b_asic/signal_generator.py

@@ -13,6 +13,7 @@ if you want more information.
 
 from math import pi, sin
 from numbers import Number
+from pathlib import Path
 from typing import Optional, Sequence
 
 import numpy as np
@@ -172,12 +173,17 @@ class FromFile(SignalGenerator):
     """
 
     def __init__(self, path) -> None:
+        try:
+            Path(path).resolve(strict=True)
+        except FileNotFoundError:
+            raise Exception("Selected input file not found.")
+
         try:
             data = np.loadtxt(path, dtype=complex).tolist()
             self._data = data
             self._len = len(data)
-        except FileNotFoundError:
-            self._window.logger.error(f"Selected input file not found.")
+        except ValueError:
+            raise Exception("Selected input file is not of the right format.")
 
     def __call__(self, time: int) -> complex:
         if 0 <= time < self._len:
@@ -185,7 +191,7 @@ class FromFile(SignalGenerator):
         return 0.0
 
     def __repr__(self) -> str:
-        return f"ZeroPad({self._data})"
+        return f"FromFile({self._data})"
 
 
 class Sinusoid(SignalGenerator):

test/test_signal_generator.py

+import os
 from math import sqrt
 
 import pytest
@@ -5,6 +6,7 @@ import pytest
 from b_asic.signal_generator import (
     Constant,
     Delay,
+    FromFile,
     Gaussian,
     Impulse,
     Sinusoid,
@@ -269,3 +271,14 @@ def test_division():
 
     assert str(g) == "Sinusoid(0.5, 0.25) / (0.5 * Step())"
     assert isinstance(g, _DivGenerator)
+
+
+def test_fromfile():
+    absolute_path = os.path.dirname(__file__)
+    relative_path = "../examples/input.csv"
+    full_path = os.path.join(absolute_path, relative_path)
+    g = FromFile(full_path)
+    assert g(-1) == 0.0
+    assert g(0) == 0
+    assert g(1) == 1
+    assert g(2) == 0