[vala/0.46] tests: Extend "s[p]lice" tests to increase coverage

[Rico Tzschichholz <ricotz src gnome org>]

commit 660c4d51314bc7c7f292e47ce28a64bfe6e22554
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun May 24 19:25:41 2020 +0200

    tests: Extend "s[p]lice" tests to increase coverage

 tests/basic-types/arrays.vala  | 4 ++++
 tests/basic-types/strings.vala | 9 +++++++++
 2 files changed, 13 insertions(+)
---
diff --git a/tests/basic-types/arrays.vala b/tests/basic-types/arrays.vala
index ac43c2050..f4777a7a7 100644
--- a/tests/basic-types/arrays.vala
+++ b/tests/basic-types/arrays.vala
@@ -38,6 +38,10 @@ void test_integer_array () {
        assert (c[0] == 23);
        assert (c[1] == 11);
 
+       int[]? c0 = a[0:0];
+       assert (c0 == null);
+       assert (c0.length == 0);
+
        // in expressions
        assert (23 in a);
        assert (!(-1 in a));
diff --git a/tests/basic-types/strings.vala b/tests/basic-types/strings.vala
index a4fcda4f7..ecead74c0 100644
--- a/tests/basic-types/strings.vala
+++ b/tests/basic-types/strings.vala
@@ -70,6 +70,9 @@ void test_string_slice () {
 
        r = s.slice (-7, -5);
        assert (r == "my");
+
+       r = s.slice (0, 0);
+       assert (r == "");
 }
 
 void test_string_splice () {
@@ -89,6 +92,12 @@ void test_string_splice () {
 
        s = s.splice (-14, -5);
        assert (s == "helloworld");
+
+       s = "hello".splice (0, 0);
+       assert (s == "hello");
+
+       s = "world".splice (0, 0, "hello");
+       assert (s == "helloworld");
 }
 
 void test_string_substring () {