tests: Add tests to validate listcon and listproj.

Two basic tests to ensure that listcon and listproj
function as expected.

Signed-off-by: Emil Sit <sit@emilsit.net>

tests/t1310-listcon.sh

@@ -0,0 +1,58 @@
+#!/bin/sh
+#
+
+test_description='listcon functionality
+
+This test checks basic context listing functionality
+'
+. ./test-lib.sh
+
+cat > todo.txt <<EOF
+item 1
+item 2
+item 3
+EOF
+test_expect_success 'listcon no contexts' '
+    todo.sh listcon > output && ! test -s output
+'
+
+cat > todo.txt <<EOF
+(A) @1 -- Some context 1 task, whitespace, one char
+(A) @c2 -- Some context 2 task, whitespace, two char
+@con03 -- Some context 3 task, no whitespace
+@con04 -- Some context 4 task, no whitespace
+@con05@con06 -- weird context
+EOF
+test_todo_session 'Single context per line' <<EOF
+>>> todo.sh listcon
+@1
+@c2
+@con03
+@con04
+@con05@con06
+EOF
+
+cat > todo.txt <<EOF
+@con01 -- Some context 1 task
+@con02 -- Some context 2 task
+@con02 @con03 -- Multi-context task
+EOF
+test_todo_session 'Multi-context per line' <<EOF
+>>> todo.sh listcon
+@con01
+@con02
+@con03
+EOF
+
+cat > todo.txt <<EOF
+@con01 -- Some context 1 task
+@con02 -- Some context 2 task
+@con02 ginatrapani@gmail.com -- Some context 2 task
+EOF
+test_todo_session 'listcon e-mail address test' <<EOF
+>>> todo.sh listcon
+@con01
+@con02
+EOF
+
+test_done