diff --git a/src/main/java/com/ctci/arraysandstrings/StringCompressionTest.java b/src/main/java/com/ctci/arraysandstrings/StringCompressionTest.java
new file mode 100644
index 00000000..291a25a6
--- /dev/null
+++ b/src/main/java/com/ctci/arraysandstrings/StringCompressionTest.java
@@ -0,0 +1,66 @@
+package com.ctci.arraysandstrings;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class StringCompressionTest {
+ @Test
+ void case1() {
+ String input = "";
+ String expectedOutput = "";
+ String actualOutput = compressString(input);
+ assertEquals(expectedOutput, actualOutput);
+ }
+
+ @Test
+ void case2() {
+ String input = "abc";
+ String expectedOutput = "abc";
+ String actualOutput = compressString(input);
+ assertEquals(expectedOutput, actualOutput);
+ }
+
+ @Test
+ void case3() {
+ String input = "aaabbccc";
+ String expectedOutput = "a3b2c3";
+ String actualOutput = compressString(input);
+ assertEquals(expectedOutput, actualOutput);
+ }
+
+ @Test
+ void case4() {
+ String input = "aaabbbccc";
+ String expectedOutput = "a3b3c3";
+ String actualOutput = compressString(input);
+ assertEquals(expectedOutput, actualOutput);
+ }
+
+ @Test
+ void case5() {
+ String input = "abcd";
+ String expectedOutput = "abcd";
+ String actualOutput = compressString(input);
+ assertEquals(expectedOutput, actualOutput);
+ }
+
+
+ private static String compressString(String str) {
+ StringBuilder compressedSb = new StringBuilder();
+ int countConsecutive = 0;
+ for (int i = 0; i < str.length(); i++) {
+ countConsecutive++;
+
+ /* If next character is different than current, append this char to result. */
+ if (i + 1 >= str.length() || str.charAt(i) != str.charAt(i + 1)) {
+ compressedSb.append(str.charAt(i));
+ compressedSb.append(countConsecutive);
+ countConsecutive = 0;
+ }
+ }
+ return compressedSb.length() < str.length() ? compressedSb.toString() : str;
+ }
+}
\ No newline at end of file
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