diff --git a/autotests/kformattest.cpp b/autotests/kformattest.cpp
--- a/autotests/kformattest.cpp
+++ b/autotests/kformattest.cpp
@@ -114,6 +114,10 @@
     QCOMPARE(format.formatValue(1000, QStringLiteral("bit/s")), QStringLiteral("1.0 kbit/s"));
     QCOMPARE(format.formatValue(10e3, QStringLiteral("bit/s")), QStringLiteral("10.0 kbit/s"));
     QCOMPARE(format.formatValue(10e6, QStringLiteral("bit/s")), QStringLiteral("10.0 Mbit/s"));
+
+    QCOMPARE(format.formatValue(0.010, KFormat::Unit::Meter, 1, KFormat::UnitPrefix::Milli, KFormat::MetricBinaryDialect), QStringLiteral("10.0 mm"));
+    QCOMPARE(format.formatValue(10.12e-6, KFormat::Unit::Meter, 2, KFormat::UnitPrefix::Micro, KFormat::MetricBinaryDialect), QStringLiteral("10.12 µm"));
+    QCOMPARE(format.formatValue(10.55e-6, KFormat::Unit::Meter, 1, KFormat::UnitPrefix::AutoAdjust, KFormat::MetricBinaryDialect), QStringLiteral("10.6 µm"));
 }
 
 enum TimeConstants {