diff --git a/black_tests/test.py b/black_tests/test.py
new file mode 100644
--- /dev/null
+++ b/black_tests/test.py
@@ -0,0 +1,48 @@
+from seven_dwwarfs import Grumpy, Happy, Sleepy, Bashful, Sneezy, Dopey, Doc
+
+x = {"a": 37, "b": 42, "c": 927}
+
+x = 123456789.123456789e123456789
+
+if (
+    very_long_variable_name is not None
+    and very_long_variable_name.field > 0
+    or very_long_variable_name.is_debug
+):
+    z = "hello " + "world"
+else:
+    world = "world"
+    a = "hello {}".format(world)
+    f = rf"hello {world}"
+if this and that:
+    y = "hello " "world"  # FIXME: https://github.com/python/black/issues/26
+
+
+class Foo(object):
+    def f(self):
+        return 37 * -2
+
+    def g(self, x, y=42):
+        return y
+
+
+def f(a: List[int]):
+    return 37 - a[42 - u : y ** 3]
+
+
+def very_important_function(
+    template: str, *variables, file: os.PathLike, debug: bool = False
+):
+    """Applies `variables` to the `template` and writes to `file`."""
+    with open(file, "w") as f:
+        ...
+
+
+# fmt: off
+custom_formatting = [
+    0,  1,  2,
+    3,  4,  5,
+    6,  7,  8,
+]
+# fmt: on
+regular_formatting = [0, 1, 2, 3, 4, 5, 6, 7, 8]