Add test for MATLAB classes that can't be read

Author: jebej

test/read.jl

@@ -212,3 +212,14 @@ let objtestfile = "figure.fig"
     @test vars["hgS_070000"]["handle"] == 1.0
     @test vars["hgS_070000"]["type"] == "figure"
 end
+
+# test reading file containing Matlab table and datetime objects
+# since we don't support these objects, just make sure that there are no errors
+# reading the file and that the variables are there and replaced with `missing`
+let objtestfile = "struct_table_datetime.mat"
+    vars = matopen(m->read(m,"s"), joinpath(dirname(@__FILE__), "v7.3", objtestfile))
+    @test "testTable" in keys(vars)
+    @test ismissing(vars["testTable"])
+    @test "testDatetime" in keys(vars)
+    @test ismissing(vars["testDatetime"])
+end