Improve coverage

Author: spurll

test/interval.jl

@@ -40,12 +40,14 @@
         @test Int(Interval(10, 10, Inclusivity(true, true))) == 10
         @test_throws DomainError Int(Interval(10, 11, Inclusivity(true, true)))
 
-        dt = Date(2013, 2, 13)
-        @test_throws DomainError Date(Interval(dt, dt, Inclusivity(false, false)))
-        @test_throws DomainError Date(Interval(dt, dt, Inclusivity(false, true)))
-        @test_throws DomainError Date(Interval(dt, dt, Inclusivity(true, false)))
-        @test Date(Interval(dt, dt, Inclusivity(true, true))) == dt
-        @test_throws DomainError Date(Interval(dt, dt + Day(1), Inclusivity(true, true)))
+        for T in (Date, DateTime)
+            dt = T(2013, 2, 13)
+            @test_throws DomainError T(Interval(dt, dt, Inclusivity(false, false)))
+            @test_throws DomainError T(Interval(dt, dt, Inclusivity(false, true)))
+            @test_throws DomainError T(Interval(dt, dt, Inclusivity(true, false)))
+            @test T(Interval(dt, dt, Inclusivity(true, true))) == dt
+            @test_throws DomainError T(Interval(dt, dt + Day(1), Inclusivity(true, true)))
+        end
     end
 
     @testset "accessors" begin