diff --git a/tests/controls/spinctrldbltest.cpp b/tests/controls/spinctrldbltest.cpp
index 1d31f10798..7416423881 100644
--- a/tests/controls/spinctrldbltest.cpp
+++ b/tests/controls/spinctrldbltest.cpp
@@ -224,4 +224,38 @@ void SpinCtrlDoubleTestCase::Digits()
     CPPUNIT_ASSERT_EQUAL(5, m_spin->GetDigits());
 }
 
+static inline unsigned int GetInitialDigits(double inc)
+{
+    wxSpinCtrlDouble* sc = new wxSpinCtrlDouble(wxTheApp->GetTopWindow(), wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, wxSP_ARROW_KEYS,
+        0, 50, 0, inc);
+    unsigned int digits = sc->GetDigits();
+    delete sc;
+    return digits;
+}
+
+TEST_CASE("SpinCtrlDoubleTestCase::InitialDigits", "[spinctrldouble][initialdigits]")
+{
+    REQUIRE(GetInitialDigits(15) == 0);
+    REQUIRE(GetInitialDigits(10) == 0);
+    REQUIRE(GetInitialDigits(1) == 0);
+    REQUIRE(GetInitialDigits(0.999) == 1);
+    REQUIRE(GetInitialDigits(0.15) == 1);
+    REQUIRE(GetInitialDigits(0.11) == 1);
+    REQUIRE(GetInitialDigits(0.1) == 1);
+    REQUIRE(GetInitialDigits(0.0999) == 2);
+    REQUIRE(GetInitialDigits(0.015) == 2);
+    REQUIRE(GetInitialDigits(0.011) == 2);
+    REQUIRE(GetInitialDigits(0.01) == 2);
+    REQUIRE(GetInitialDigits(9.99e-5) == 5);
+    REQUIRE(GetInitialDigits(1e-5) == 5);
+    REQUIRE(GetInitialDigits(9.9999e-10) == 10);
+    REQUIRE(GetInitialDigits(1e-10) == 10);
+    REQUIRE(GetInitialDigits(9.9999e-20) == 20);
+    REQUIRE(GetInitialDigits(1e-20) == 20);
+    REQUIRE(GetInitialDigits(9.9999e-21) == 20);
+    REQUIRE(GetInitialDigits(1e-21) == 20);
+    REQUIRE(GetInitialDigits(9.9999e-22) == 20);
+    REQUIRE(GetInitialDigits(1e-22) == 20);
+}
+
 #endif