Add assert statements to catch undefined components in system functio…

…n calls #95

payload_designer/components/sensors.py

@@ -63,7 +63,9 @@ def __init__(
     def get_size(self) -> tuple:
         """Get the size of the sensor face in the (x, y) dimensions of the
         cubesat frame."""
-
+        assert self.n_px is not None, "n_px must be specified."
+        assert self.pitch is not None, "Pitch must be specified."
+
         size = (self.n_px * self.pitch, self.n_px * self.pitch)
 
         return size
@@ -83,28 +85,35 @@ def get_pixel_area(self):
         Assumes square pixels.
 
         """
+        assert self.pitch is not None, "Pitch must be specified."
 
         pixel_area = self.pitch**2
 
         return pixel_area
 
     def get_dark_noise(self):
         """Get the dark noise of the sensor."""
-
+        assert self.i_dark is not None, "i_dark must be specified."
+        assert self.dt is not None, "dt amplitude must be specified."
+
         dark_noise = self.i_dark * self.dt
 
         return dark_noise
 
     def get_quantization_noise(self):
         """Get the quantization noise of the sensor."""
-
+        assert self.n_well is not None, "n_well must be specified."
+        assert self.n_bit is not None, "n_bit must be specified."
+
         quant_noise = (1 / math.sqrt(12)) * self.n_well / 2**self.n_bit
 
         return quant_noise
 
     def get_noise(self, signal):
         """Get the net noise of the sensor."""
-
+        assert self.n_bin is not None, "n_bin must be specified."
+        assert self.noise_read is not None, "noise_read must be specified."
+
         noise = np.sqrt(
             signal
             + self.n_bin * self.get_dark_noise() ** 2