public void TestArrayType()
{
CSharpCompilation compilation = CSharpCompilation.Create("Test");
NamedTypeSymbol elementType = new MockNamedTypeSymbol("TestClass", Enumerable.Empty <Symbol>()); // this can be any type.
ArrayTypeSymbol ats1 = ArrayTypeSymbol.CreateCSharpArray(compilation.Assembly, elementType, rank: 1);
Assert.Equal(1, ats1.Rank);
Assert.True(ats1.IsSZArray);
Assert.Same(elementType, ats1.ElementType);
Assert.Equal(SymbolKind.ArrayType, ats1.Kind);
Assert.True(ats1.IsReferenceType);
Assert.False(ats1.IsValueType);
Assert.Equal("TestClass[]", ats1.ToTestDisplayString());
ArrayTypeSymbol ats2 = ArrayTypeSymbol.CreateCSharpArray(compilation.Assembly, elementType, rank: 2);
Assert.Equal(2, ats2.Rank);
Assert.Same(elementType, ats2.ElementType);
Assert.Equal(SymbolKind.ArrayType, ats2.Kind);
Assert.True(ats2.IsReferenceType);
Assert.False(ats2.IsValueType);
Assert.Equal("TestClass[,]", ats2.ToTestDisplayString());
ArrayTypeSymbol ats3 = ArrayTypeSymbol.CreateCSharpArray(compilation.Assembly, elementType, rank: 3);
Assert.Equal(3, ats3.Rank);
Assert.Equal("TestClass[,,]", ats3.ToTestDisplayString());
}