4 files changed, 97 insertions, 0 deletions
diff --git a/tests/cpydiff/types_float_implicit_conversion.py b/tests/cpydiff/types_float_implicit_conversion.py
new file mode 100644
index 000000000..8d39a7cd4
--- /dev/null
+++ b/tests/cpydiff/types_float_implicit_conversion.py
@@ -0,0 +1,14 @@
+"""
+categories: Types,float
+description: uPy allows implicit conversion of objects in maths operations while CPython does not.
+cause: Unknown
+workaround: Objects should be wrapped in `float(obj)` for compatibility with CPython.
+"""
+
+
+class Test:
+    def __float__(self):
+        return 0.5
+
+
+print(2.0 * Test())
diff --git a/tests/float/complex_dunder.py b/tests/float/complex_dunder.py
new file mode 100644
index 000000000..128dc6929
--- /dev/null
+++ b/tests/float/complex_dunder.py
@@ -0,0 +1,40 @@
+# test __complex__ function support
+
+
+class TestComplex:
+    def __complex__(self):
+        return 1j + 10
+
+
+class TestStrComplex:
+    def __complex__(self):
+        return "a"
+
+
+class TestNonComplex:
+    def __complex__(self):
+        return 6
+
+
+class Test:
+    pass
+
+
+print(complex(TestComplex()))
+
+try:
+    print(complex(TestStrComplex()))
+except TypeError:
+    print("TypeError")
+
+
+try:
+    print(complex(TestNonComplex()))
+except TypeError:
+    print("TypeError")
+
+
+try:
+    print(complex(Test()))
+except TypeError:
+    print("TypeError")
diff --git a/tests/float/float_dunder.py b/tests/float/float_dunder.py
new file mode 100644
index 000000000..1cd03db52
--- /dev/null
+++ b/tests/float/float_dunder.py
@@ -0,0 +1,42 @@
+# test __float__ function support
+
+
+class TestFloat:
+    def __float__(self):
+        return 10.0
+
+
+class TestStrFloat:
+    def __float__(self):
+        return "a"
+
+
+class TestNonFloat:
+    def __float__(self):
+        return 6
+
+
+class Test:
+    pass
+
+
+print("%.1f" % float(TestFloat()))
+print("%.1f" % TestFloat())
+
+
+try:
+    print(float(TestStrFloat()))
+except TypeError:
+    print("TypeError")
+
+
+try:
+    print(float(TestNonFloat()))
+except TypeError:
+    print("TypeError")
+
+
+try:
+    print(float(Test()))
+except TypeError:
+    print("TypeError")
diff --git a/tests/run-tests.py b/tests/run-tests.py
index 2d6dbaaf1..baab7bdd4 100755
--- a/tests/run-tests.py
+++ b/tests/run-tests.py
@@ -525,6 +525,7 @@ def run_tests(pyb, tests, args, result_dir, num_threads=1):
         skip_tests.add("float/int_big_float.py")
         skip_tests.add("float/true_value.py")
         skip_tests.add("float/types.py")
+        skip_tests.add("float/complex_dunder.py")
 
     if not has_coverage:
         skip_tests.add("cmdline/cmd_parsetree.py")