Add test for show method

test/runtests.jl

@@ -60,6 +60,10 @@ Random.seed!(0)
     println("Model statistics")
     @time include("modelstats_test.jl")
 
+    # run tests for show methods
+    println("Show methods")
+    @time include("show_tests.jl")
+
     # run tests for concatenation
     println("Concatenation")
     @time include("concatenation_tests.jl")

test/show_tests.jl

@@ -0,0 +1,23 @@
+using Test
+using MCMCChains
+
+@testset "Show tests" begin
+    rng = MersenneTwister(1234)
+    val = rand(rng, 100, 4, 4)
+    parm_names = ["a", "b", "c", "d"]
+    chns = Chains(val, parm_names, Dict(:internals => ["b", "d"]))[1:2:99, :, :]
+    str = sprint(show, "text/plain", chns)
+    stats_str = sprint(show, "text/plain", summarystats(chns))
+    quantile_str = sprint(show, "text/plain", quantile(chns))
+    @test str == """Chains MCMC chain (50×4×4 Array{Float64, 3}):
+
+    Iterations        = 1:2:99
+    Number of chains  = 4
+    Samples per chain = 50
+    parameters        = a, c
+    internals         = b, d
+
+    $stats_str
+
+    $quantile_str"""
+end