New test: "stg diff"

A simple test to make sure that we can run "stg diff" without
arguments, just to list local changes.

Note that two subtests currently fail; these are due to plain "stg
diff" failing on a branch where "stg init" hasn't been run, which is
plainly a bug.

Signed-off-by: Karl Hasselström <kha@treskal.com>

diff --git a/t/t2400-diff.sh b/t/t2400-diff.sh
new file mode 100755 (executable)
index 0000000..6d9ed98
--- /dev/null
+++ b/t/t2400-diff.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+test_description='Run "stg diff"'
+
+. ./test-lib.sh
+
+test_expect_failure 'Diff with no StGit data' '
+    stg diff
+'
+
+test_expect_success 'Make some local changes' '
+    echo foo >> foo.txt &&
+    git add foo.txt
+'
+
+test_expect_failure 'Diff with some local changes' '
+    stg diff
+'
+
+test_expect_success 'Initialize StGit stuff' '
+    stg init &&
+    stg new foo -m foo
+'
+
+test_expect_success 'Diff with some local changes' '
+    stg diff
+'
+
+test_expect_success 'Refresh patch' '
+    stg refresh
+'
+
+test_expect_success 'Diff with no local changes' '
+    stg diff
+'
+
+test_done