add ref test fv_euler_isentropic_flow

test/IntegrationTests/refs/fv_euler_isentropic_flow/fv_euler_isentropic_flow.toml

+[EquationOfState]
+idealgas_gamma = 3.0
+eos = "idealgas"
+
+[EulerEq]
+id = "smooth_isentropic_flow"
+
+[Evolution]
+cfl = 0.9
+tend = 0.50
+
+[Mesh]
+range = [-1.0, 1.0]
+k = 1048
+scheme = "FV"
+
+
+[Output]
+variables = ["rho", "q", "E"]
+every_dt = 0.02

test/IntegrationTests/refs/testconfig.toml

@@ -44,6 +44,9 @@ variables = [ "u" ]
 # stops before discontinuity appears
 variables = [ "rho", "q", "E" ]
 
+[fv_euler_sod_shock_tube]
+variables = [ "rho", "q", "E" ]
+
 # [euler_isentropic_flow_regulate-ns]
 # # stops before discontinuity appears
 # variables = [ "rho", "q", "E" ]