Adding test cases for StringParser

FlySpring/edgechain-app/src/test/java/com/edgechain/parser/StringParserTest.java

@@ -1,8 +1,5 @@
 package com.edgechain.parser;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertNotNull;
-
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.slf4j.Logger;
@@ -11,6 +8,8 @@
 
 import com.edgechain.lib.openai.parser.StringParser;
 
+import static org.junit.jupiter.api.Assertions.*;
+
 @SpringBootTest
 public class StringParserTest {
 
@@ -99,4 +98,36 @@ public void StringParser_GetFinalAnswer_ReturnsExpectedValue() {
     assertNotNull(finalAnswer);
     assertEquals("Final Answer", finalAnswer);
   }
+
+  @Test
+  @DisplayName("Test String parser with empty input")
+  public void StringParser_EmptyInput_ReturnExpectedValue(){
+    String input = "";
+    assertThrows(Exception.class, () -> new StringParser(input));
+  }
+
+  @Test
+  @DisplayName("Test string parser with multiple thoughts, actions, and observations")
+  public void StringParser_MultipleContents_ReturnsExpectedValues() {
+    String input =
+            "Thought 1: Lorem ipsum\n"
+                    + "Action 1: [Search: Content for action 1]\n"
+                    + "Observation 1: Some observation\n"
+                    + "Thought 2: Dolor sit amet\n"
+                    + "Action 2: [Search: Content for action 2]\n"
+                    + "Observation 2: Another observation"
+                    + "Thought 3: Dolor sit amet\n"
+                    + "Action 3: [Search: Content for action 2]\n"
+                    + "Observation 3: Another observation";
+
+    StringParser parser = new StringParser(input);
+
+    String[] thoughts = parser.getThoughts();
+    String[] actions = parser.getActions();
+    String[] observations = parser.getObservations();
+
+    assertEquals(3, thoughts.length);
+    assertEquals(3, actions.length);
+    assertEquals(3, observations.length);
+  }
 }