1 files changed, 49 insertions, 0 deletions
diff --git a/_test/test_a_dedent.py b/_test/test_a_dedent.py
new file mode 100644
index 0000000..a4adf33
--- /dev/null
+++ b/_test/test_a_dedent.py
@@ -0,0 +1,49 @@
+# coding: utf-8
+
+from roundtrip import dedent  # type: ignore
+
+
+class TestDedent:
+    def test_start_newline(self) -> None:
+        # fmt: off
+        x = dedent("""
+        123
+          456
+        """)
+        # fmt: on
+        assert x == '123\n  456\n'
+
+    def test_start_space_newline(self) -> None:
+        # special construct to prevent stripping of following whitespace
+        # fmt: off
+        x = dedent("   " """
+        123
+        """)
+        # fmt: on
+        assert x == '123\n'
+
+    def test_start_no_newline(self) -> None:
+        # special construct to prevent stripping of following whitespac
+        x = dedent("""\
+        123
+          456
+        """)
+        assert x == '123\n  456\n'
+
+    def test_preserve_no_newline_at_end(self) -> None:
+        x = dedent("""
+        123""")
+        assert x == '123'
+
+    def test_preserve_no_newline_at_all(self) -> None:
+        x = dedent("""\
+        123""")
+        assert x == '123'
+
+    def test_multiple_dedent(self) -> None:
+        x = dedent(
+            dedent("""
+        123
+        """),
+        )
+        assert x == '123\n'