diff --git a/src/main/java/ru/ulstu/is/lab1/speaker/domain/MethodInt.java b/src/main/java/ru/ulstu/is/lab1/speaker/domain/MethodInt.java
index 6034879..ebd47bd 100644
--- a/src/main/java/ru/ulstu/is/lab1/speaker/domain/MethodInt.java
+++ b/src/main/java/ru/ulstu/is/lab1/speaker/domain/MethodInt.java
@@ -5,20 +5,20 @@ import org.springframework.stereotype.Component;
 @Component(value="int")
 public class MethodInt implements IMethod<Integer>{
     public Integer Sum(Integer first, Integer second) {
-        return Integer.parseInt(first.toString()) + Integer.parseInt(second.toString());
+        return first + second;
     }
 
     public Integer Minus(Integer first, Integer second) {
-        return Integer.parseInt(first.toString()) - Integer.parseInt(second.toString());
+        return first - second;
     }
 
     public Integer Reverse(Integer first, Integer second) {
-        return (Integer.parseInt(first.toString()) + Integer.parseInt(second.toString())) * (-1);
+        return (first + second) * (-1);
     }
 
     public Integer Comparison(Integer first, Integer second) {
-        int num1 = Integer.parseInt(first.toString());
-        int num2 = Integer.parseInt(second.toString());
+        int num1 = first;
+        int num2 = second;
         if (num1 >= num2){
             return num1;
         }else{
diff --git a/src/main/java/ru/ulstu/is/lab1/speaker/domain/MethodString.java b/src/main/java/ru/ulstu/is/lab1/speaker/domain/MethodString.java
index a12c991..1d2ea65 100644
--- a/src/main/java/ru/ulstu/is/lab1/speaker/domain/MethodString.java
+++ b/src/main/java/ru/ulstu/is/lab1/speaker/domain/MethodString.java
@@ -11,9 +11,9 @@ public class MethodString implements IMethod<String>{
 
     @Override
     public String Minus(String first, String second) {
-        String arr[] = first.split("");
+        String[] arr = first.split("");
         for(int i = 0; i < first.length(); i++){
-            if (second.indexOf(arr[i]) >= 0){
+            if (second.contains(arr[i])){
                 arr[i] = "";
             }
         }
@@ -23,11 +23,11 @@ public class MethodString implements IMethod<String>{
     @Override
     public String Reverse(String first, String second) {
         String ourStr = first.concat(second);
-        String newStr = "";
+        StringBuilder newStr = new StringBuilder();
         for(int i = ourStr.length() - 1; i >= 0; i--){
-            newStr += ourStr.charAt(i);
+            newStr.append(ourStr.charAt(i));
         }
-        return newStr;
+        return newStr.toString();
     }
 
     @Override
diff --git a/src/test/java/ru/ulstu/is/lab1/Lab1ApplicationTests.java b/src/test/java/ru/ulstu/is/lab1/Lab1ApplicationTests.java
index 4113855..772942c 100644
--- a/src/test/java/ru/ulstu/is/lab1/Lab1ApplicationTests.java
+++ b/src/test/java/ru/ulstu/is/lab1/Lab1ApplicationTests.java
@@ -1,13 +1,58 @@
 package ru.ulstu.is.lab1;
 
+import ru.ulstu.is.lab1.speaker.service.MethodService;
+import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
 @SpringBootTest
 class Lab1ApplicationTests {
 
+	@Autowired
+	MethodService methodService;
 	@Test
 	void contextLoads() {
 	}
 
+	@Test
+	void testPlusInt() {
+		final String res = methodService.Sum(10, 10, "int");
+		Assertions.assertEquals(20, Integer.parseInt(res));
+	}
+	@Test
+	void testMinusInt() {
+		final String res = methodService.Ras(8, 4, "int");
+		Assertions.assertEquals(4, Integer.parseInt(res));
+	}
+	@Test
+	void testReverseInt() {
+		final String res = methodService.Rev(10, 10, "int");
+		Assertions.assertEquals(-20, Integer.parseInt(res));
+	}
+	@Test
+	void testComparisonInt() {
+		final String res = methodService.Com(8, 4, "int");
+		Assertions.assertEquals(8, Integer.parseInt(res));
+	}
+	@Test
+	void testPlusStr() {
+		final String res = methodService.Sum("10", "10", "string");
+		Assertions.assertEquals("1010", res);
+	}
+	@Test
+	void testMinusStr() {
+		final String res = methodService.Ras("846734", "4", "string");
+		Assertions.assertEquals("8673", res);
+	}
+	@Test
+	void testReverseStr() {
+		final String res = methodService.Rev("846734", "312", "string");
+		Assertions.assertEquals("213437648", res);
+	}
+	@Test
+	void testComparisonStr() {
+		final String res = methodService.Com("846734", "312", "string");
+		Assertions.assertEquals("846734", res);
+	}
 }