Removed test that took too long for pipeline and added docstring for the fft function.

b_asic/sfg_generators.py

@@ -378,6 +378,18 @@ def direct_form_2_iir(
 
 
 def radix_2_dif_fft(points: int) -> SFG:
+    """Generates a radix-2 decimation-in-frequency FFT structure.
+
+    Parameters
+    ----------
+    points : int
+        Number of points for the FFT, needs to be a positive power of 2.
+
+    Returns
+    -------
+    SFG
+        Signal Flow Graph
+    """
     if points < 0:
         raise ValueError("Points must be positive number.")
     if points & (points - 1) != 0:

test/test_sfg_generators.py

@@ -358,28 +358,6 @@ def test_radix_2_dif_fft_256_points_sinus_input():
         assert np.isclose(a, b)
 
 
-def test_radix_2_dif_fft_512_points_sinus_input_half_frequency():
-    POINTS = 512
-    sfg = radix_2_dif_fft(points=POINTS)
-
-    assert len(sfg.inputs) == POINTS
-    assert len(sfg.outputs) == POINTS
-
-    n = np.linspace(0, 2 * np.pi, POINTS)
-    waveform = np.sin(0.5 * n)
-    input_samples = [Constant(waveform[i]) for i in range(POINTS)]
-
-    sim = Simulation(sfg, input_samples)
-    sim.run_for(1)
-
-    exp_res = np.fft.fft(waveform)
-    res = sim.results
-    for i in range(POINTS):
-        a = res[str(i)]
-        b = exp_res[i]
-        assert np.isclose(a, b)
-
-
 def test_radix_2_dif_fft_negative_number_of_points():
     POINTS = -8
     with pytest.raises(ValueError, match="Points must be positive number."):