add json parse test

Author: cx-itay-paz

src/test/java/com/checkmarx/ast/JsonParserTest.java

@@ -0,0 +1,68 @@
+package com.checkmarx.ast;
+
+import com.checkmarx.ast.utils.JsonParser;
+import com.fasterxml.jackson.databind.JavaType;
+import com.fasterxml.jackson.databind.type.TypeFactory;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+
+class JsonParserTest extends BaseTest {
+
+    @Test
+    void testValidJsonParsing_WhenValidJsonProvided_ReturnsParsedObject() {
+        // Arrange
+        String validJson = "{\"name\": \"test\", \"value\": 123}";
+        TypeFactory typeFactory = TypeFactory.defaultInstance();
+        JavaType type = typeFactory.constructMapType(Map.class, String.class, Object.class);
+        
+        // Act
+        Map<String, Object> result = JsonParser.parse(validJson, type);
+        
+        // Assert
+        Assertions.assertNotNull(result, "Result should not be null");
+        Assertions.assertEquals("test", result.get("name"), "Name value should match");
+        Assertions.assertEquals(123, result.get("value"), "Numeric value should match");
+    }
+
+    @Test
+    void testNullAndEmptyInput_WhenInvalidInputProvided_ReturnsNull() {
+        // Arrange
+        TypeFactory typeFactory = TypeFactory.defaultInstance();
+        JavaType type = typeFactory.constructMapType(Map.class, String.class, String.class);
+        
+        // Act & Assert
+        Assertions.assertNull(JsonParser.parse(null, type), "Null input should return null");
+        Assertions.assertNull(JsonParser.parse("", type), "Empty string should return null");
+        Assertions.assertNull(JsonParser.parse("   ", type), "Whitespace should return null");
+    }
+
+    @Test
+    void testInvalidJson_WhenMalformedJsonProvided_ReturnsNull() {
+        // Arrange
+        TypeFactory typeFactory = TypeFactory.defaultInstance();
+        JavaType type = typeFactory.constructMapType(Map.class, String.class, String.class);
+        
+        // Act & Assert
+        Assertions.assertNull(JsonParser.parse("{invalid:json}", type), "Invalid JSON should return null");
+        Assertions.assertNull(JsonParser.parse("{\"key\":\"value\"", type), "Incomplete JSON should return null");
+    }
+
+    @Test
+    void testListParsing_WhenValidJsonArrayProvided_ReturnsParsedList() {
+        // Arrange
+        String jsonList = "[\"item1\", \"item2\", \"item3\"]";
+        TypeFactory typeFactory = TypeFactory.defaultInstance();
+        JavaType type = typeFactory.constructCollectionType(List.class, String.class);
+        
+        // Act
+        List<String> result = JsonParser.parse(jsonList, type);
+        
+        // Assert
+        Assertions.assertNotNull(result, "Result should not be null");
+        Assertions.assertEquals(Arrays.asList("item1", "item2", "item3"), result, "List contents should match");
+    }
+}