1 files changed, 56 insertions, 0 deletions
diff --git a/tests/test_test_mixins.py b/tests/test_test_mixins.py
new file mode 100644
index 00000000..b8a3ac67
--- /dev/null
+++ b/tests/test_test_mixins.py
@@ -0,0 +1,56 @@
+# -*- coding: utf-8 -*-
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Tests of code in tests/mixins.py"""
+
+from tests.mixins import TempDirMixin
+
+
+class TempDirMixinTest(TempDirMixin):
+    """Test the methods in TempDirMixin."""
+
+    def file_text(self, fname):
+        """Return the text read from a file."""
+        with open(fname, "rb") as f:
+            return f.read().decode('ascii')
+
+    def test_make_file(self):
+        # A simple file.
+        self.make_file("fooey.boo", "Hello there")
+        assert self.file_text("fooey.boo") == "Hello there"
+        # A file in a sub-directory
+        self.make_file("sub/another.txt", "Another")
+        assert self.file_text("sub/another.txt") == "Another"
+        # A second file in that sub-directory
+        self.make_file("sub/second.txt", "Second")
+        assert self.file_text("sub/second.txt") == "Second"
+        # A deeper directory
+        self.make_file("sub/deeper/evenmore/third.txt")
+        assert self.file_text("sub/deeper/evenmore/third.txt") == ""
+        # Dedenting
+        self.make_file("dedented.txt", """\
+            Hello
+            Bye
+            """)
+        assert self.file_text("dedented.txt") == "Hello\nBye\n"
+
+    def test_make_file_newline(self):
+        self.make_file("unix.txt", "Hello\n")
+        assert self.file_text("unix.txt") == "Hello\n"
+        self.make_file("dos.txt", "Hello\n", newline="\r\n")
+        assert self.file_text("dos.txt") == "Hello\r\n"
+        self.make_file("mac.txt", "Hello\n", newline="\r")
+        assert self.file_text("mac.txt") == "Hello\r"
+
+    def test_make_file_non_ascii(self):
+        self.make_file("unicode.txt", "tablo: «ταБℓσ»")
+        with open("unicode.txt", "rb") as f:
+            text = f.read()
+        assert text == b"tablo: \xc2\xab\xcf\x84\xce\xb1\xd0\x91\xe2\x84\x93\xcf\x83\xc2\xbb"
+
+    def test_make_bytes_file(self):
+        self.make_file("binary.dat", bytes=b"\x99\x33\x66hello\0")
+        with open("binary.dat", "rb") as f:
+            data = f.read()
+        assert data == b"\x99\x33\x66hello\0"