add missing test markdown file

tests/testthat/_snaps/LongitudinalSteinFojo.md

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+# Print method for LongitudinalSteinFojo works as expected
+
+    Code
+      x <- LongitudinalSteinFojo()
+      print(x)
+    Output
+      
+      Stein-Fojo Longitudinal Model with parameters:
+          lm_sf_mu_bsld ~ normal(mu = 4.09434, sigma = 1)
+          lm_sf_mu_ks ~ normal(mu = -0.69315, sigma = 1)
+          lm_sf_mu_kg ~ normal(mu = -1.20397, sigma = 1)
+          lm_sf_omega_bsld ~ lognormal(mu = -1.60944, sigma = 1)
+          lm_sf_omega_ks ~ lognormal(mu = -1.60944, sigma = 1)
+          lm_sf_omega_kg ~ lognormal(mu = -1.60944, sigma = 1)
+          lm_sf_sigma ~ lognormal(mu = -2.30259, sigma = 1)
+          lm_sf_eta_tilde_bsld ~ std_normal()
+          lm_sf_eta_tilde_ks ~ std_normal()
+          lm_sf_eta_tilde_kg ~ std_normal()
+      
+
+---
+
+    Code
+      x <- LongitudinalSteinFojo(sigma = prior_normal(0, 1), mu_kg = prior_gamma(2, 1))
+      print(x)
+    Output
+      
+      Stein-Fojo Longitudinal Model with parameters:
+          lm_sf_mu_bsld ~ normal(mu = 4.09434, sigma = 1)
+          lm_sf_mu_ks ~ normal(mu = -0.69315, sigma = 1)
+          lm_sf_mu_kg ~ gamma(alpha = 2, beta = 1)
+          lm_sf_omega_bsld ~ lognormal(mu = -1.60944, sigma = 1)
+          lm_sf_omega_ks ~ lognormal(mu = -1.60944, sigma = 1)
+          lm_sf_omega_kg ~ lognormal(mu = -1.60944, sigma = 1)
+          lm_sf_sigma ~ normal(mu = 0, sigma = 1)
+          lm_sf_eta_tilde_bsld ~ std_normal()
+          lm_sf_eta_tilde_ks ~ std_normal()
+          lm_sf_eta_tilde_kg ~ std_normal()
+      
+