Add flux loop regression coverage

Author: hughcars

test/data/regression/input/circular_hole/circular_hole.json

@@ -0,0 +1 @@
+../../../../../examples/circular_hole/circular_hole.json

test/data/regression/input/circular_hole/mesh/circular_hole.msh

@@ -0,0 +1 @@
+../../../../../../examples/circular_hole/mesh/circular_hole.msh

test/data/regression/ref/circular_hole/domain-E.csv

@@ -0,0 +1,2 @@
+        i,                 E_elec (J),                  E_mag (J),                  E_cap (J),                  E_ind (J),              E_elec[1] (J),                  p_elec[1],               E_mag[1] (J),                   p_mag[1]
+ 1.00e+00,        +0.000000000000e+00,        +2.478886703363e-13,        +0.000000000000e+00,        +0.000000000000e+00,        +0.000000000000e+00,        +0.000000000000e+00,        +2.478886703363e-13,        +1.000000000000e+00

test/data/regression/ref/circular_hole/error-indicators.csv

@@ -0,0 +1,2 @@
+                       Norm,                    Minimum,                    Maximum,                       Mean
+        +8.347937179055e-01,        +2.261530630087e-08,        +9.587149491729e-02,        +1.406899720617e-03

test/data/regression/ref/circular_hole/probe-B.csv

@@ -0,0 +1,2 @@
+        i,             B_x[1] (Wb/m²),             B_y[1] (Wb/m²),             B_z[1] (Wb/m²)
+ 1.00e+00,        +2.112707791391e-02,        +2.104707540376e-02,        +2.642460038128e-02

test/data/regression/ref/circular_hole/terminal-M.csv

@@ -0,0 +1,2 @@
+        i,                M[i][1] (H)
+ 1.00e+00,        +1.902326271052e-12

test/data/regression/ref/circular_hole/terminal-Minv.csv

@@ -0,0 +1,2 @@
+        i,            M⁻¹[i][1] (1/H)
+ 1.00e+00,        +5.256721810644e+11

test/data/regression/ref/circular_hole/terminal-Mm.csv

@@ -0,0 +1,2 @@
+        i,              M_m[i][1] (H)
+ 1.00e+00,        +1.902326271052e-12

test/data/regression/ref/circular_hole/terminal-Phi.csv

@@ -0,0 +1,2 @@
+        i,            Phi_inc[i] (Wb)
+ 1.00e+00,        +9.711489379872e-13

test/unit/regression/cases.cpp

@@ -204,6 +204,16 @@ TEST_CASE("rings", "[Serial][Parallel][GPU][Regression]")
   palace::test::RunRegressionCase("rings", "rings.json", "", opts);
 }
 
+TEST_CASE("circular_hole_flux_loop", "[Serial][Parallel][GPU][Regression]")
+{
+  palace::test::RegressionOptions opts;
+  opts.rtol = 1.0e-4;
+  opts.atol = 1.0e-16;
+  opts.excluded_columns = {"Maximum", "Minimum", "Mean"};
+  opts.linear_solver_policy = kForceDefaultSolver;
+  palace::test::RunRegressionCase("circular_hole", "circular_hole.json", "", opts);
+}
+
 // --- cylinder: reltol=1e-4, abstol=1e-16 for the four eigen-style cases ---
 
 TEST_CASE("cylinder_cavity_pec", "[Serial][Parallel][GPU][Regression]")