Add tests

Author: kaste

tests/test_history_mixin.py

@@ -0,0 +1,32 @@
+from unittesting import DeferrableTestCase
+from GitSavvy.tests.mockito import when, verify
+from GitSavvy.tests.parameterized import parameterized as p
+
+from GitSavvy.core.git_mixins.history import HistoryMixin
+
+
+examples = [
+    ("from commit to working dir", "abc", None, ["abc", None]),
+    ("from commit to commit", "abc", "def", ["abc", "def"]),
+    ("from commit to commit", "abc", "HEAD", ["abc", "HEAD"]),
+    ("from working dir to commit", None, "def", ["-R", "def"]),
+    ("from working dir to HEAD", None, "HEAD", ["-R", "HEAD"]),
+]
+
+
+class TestDescribeGraphLine(DeferrableTestCase):
+    @p.expand(examples)
+    def test_no_context_diff_logic(self, _, base, target, cmd):
+        test = HistoryMixin()
+        when(test, strict=False).git("diff", ...).thenReturn("irrelevant")
+        test.no_context_diff(base, target)
+        common = ["diff", "--no-color", "-U0"]
+        verify(test).git(*(common + cmd))
+
+    def test_no_context_diff_add_file_if_given(self):
+        test = HistoryMixin()
+        when(test, strict=False).git("diff", ...).thenReturn("irrelevant")
+        test.no_context_diff("a", "b", "foofile.py")
+        common = ["diff", "--no-color", "-U0"]
+        cmd = ["a", "b", "--", "foofile.py"]
+        verify(test).git(*(common + cmd))