diff --git a/tests/core/pistringTest.cpp b/tests/core/pistringTest.cpp
index 8b637365..742d0783 100644
--- a/tests/core/pistringTest.cpp
+++ b/tests/core/pistringTest.cpp
@@ -454,3 +454,69 @@ TEST(PIString_Tests, operator_grater_eq_pistring_false){
 	PIString str2 = "testin";
 	ASSERT_FALSE(str2 >= str1);
 }
+
+TEST(PIString_Tests, operator_grater_eq_pistring_true_equal){
+	PIString str1 = "testing";
+	PIString str2 = "testing";
+	ASSERT_TRUE(str1 >= str2);
+}
+
+TEST(PIString_Tests, operator_grater_eq_pichar_true){
+	PIString str1 = "t";
+	PIChar str2 = "a";
+	ASSERT_TRUE(str1 >= str2);
+}
+
+TEST(PIString_Tests, operator_grater_eq_pichar_false){
+	PIString str1 = "a";
+	PIChar str2 = "t";
+	ASSERT_FALSE(str1 >= str2);
+}
+
+TEST(PIString_Tests, operator_grater_eq_pichar_true_equal){
+	PIString str1 = "t";
+	PIChar str2 = "t";
+	ASSERT_TRUE(str1 >= str2);
+}
+
+TEST(PIString_Tests, operator_grater_eq_cstring_true){
+	PIString str1 = "t";
+	char str2[] = "a";
+	ASSERT_TRUE(str1 >= str2);
+}
+
+TEST(PIString_Tests, operator_grater_eq_cstring_false){
+	PIString str1 = "a";
+	char str2[] = "t";
+	ASSERT_FALSE(str1 >= str2);
+}
+
+TEST(PIString_Tests, operator_grater_eq_cstring_true_equal){
+	PIString str1 = "t";
+	char str2[] = "t";
+	ASSERT_TRUE(str1 >= str2);
+}
+
+TEST(PIString_Tests, operator_shift_pistring){
+	PIString str1 = "shift";
+	PIString str2 = " good";
+	str1 << str2;
+	PIString res = "shift good";
+	ASSERT_EQ(res, str1);
+}
+
+TEST(PIString_Tests, operator_shift_pichar){
+	PIString str1 = "shif";
+	PIChar str2 = 't';
+	str1 << str2;
+	PIString res = "shift";
+	ASSERT_EQ(res, str1);
+}
+
+TEST(PIString_Tests, operator_shift_cstring){
+	PIString str1 = "shif";
+	char str2[] = "t chat";
+	str1 << str2;
+	PIString res = "shift chat";
+	ASSERT_EQ(res, str1);
+}