fix broken test

Author: tylerflex

.pylintrc

@@ -9,4 +9,4 @@ good-names=ax, im, Lx, Ly, Lz, x0, y0, z0, x, y, z, u, v, w, f, t, y1, y2, x1, x
 max-line-length=100
 
 [pre-commit-hook]
-disable=pointless-string-statement, too-many-ancestors, too-few-public-methods, fixme, logging-not-lazy, logging-fstring-interpolation, no-self-argument, duplicate-code, unspecified-encoding, no-self-use, missing-timeout, use-dict-literal
+disable=pointless-string-statement, too-many-ancestors, too-few-public-methods, fixme, logging-not-lazy, logging-fstring-interpolation, no-self-argument, duplicate-code, unspecified-encoding, no-self-use, missing-timeout, use-dict-literal, nested-min-max

tidy3d/components/simulation.py

@@ -1135,8 +1135,8 @@ def eps_bounds(self, freq: float = None) -> Tuple[float, float]:
         medium_list = [self.medium] + list(self.mediums)
         medium_list = [medium for medium in medium_list if not isinstance(medium, PECMedium)]
         eps_list = [medium.eps_model(freq).real for medium in medium_list]
-        eps_min = min(1, eps_list)
-        eps_max = max(1, eps_list)
+        eps_min = min(1, min(eps_list))
+        eps_max = max(1, max(eps_list))
         return eps_min, eps_max
 
     def _get_structure_eps_plot_params(