fix: value type (#6076)

* fix: value type

* perf: empty val check

test/cases/service/core/app/workflow/dispatch/http.test.ts

@@ -19,6 +19,8 @@ describe('replaceJsonBodyString', () => {
   ] as unknown as RuntimeNodeItemType[];
 
   const mockVariables = {
+    undefinedVar: undefined,
+    nullVar: null,
     userName: 'John Doe',
     userAge: 30,
     isActive: true,
@@ -43,6 +45,14 @@ describe('replaceJsonBodyString', () => {
   };
 
   describe('Basic variable replacement functionality', () => {
+    it('字符串为空', () => {
+      const input = '{"name": "{{undefinedVar}}"}';
+      const expected = '{"name": ""}';
+
+      const result = replaceJsonBodyString({ text: input }, mockProps);
+      expect(result).toBe(expected);
+    });
+
     it('should correctly replace string variables', () => {
       const input = '{"name": "{{userName}}", "greeting": "Hello {{userName}}"}';
       const expected = '{"name": "John Doe", "greeting": "Hello John Doe"}';
@@ -241,7 +251,7 @@ describe('replaceJsonBodyString', () => {
 
     it('should handle non-existent variables', () => {
       const input = '{"missing": "{{nonExistentVar}}", "static": "value"}';
-      const expected = '{"missing": "null", "static": "value"}';
+      const expected = '{"missing": "", "static": "value"}';
 
       const result = replaceJsonBodyString({ text: input }, mockProps);
       expect(result).toBe(expected);
@@ -626,7 +636,7 @@ describe('replaceJsonBodyString', () => {
 
       // Verify no code execution occurred (template injection variable was replaced with null because it doesn't exist)
       expect(typeof parsed.templateTests.inject).toBe('string');
-      expect(parsed.templateTests.inject).toBe('null'); // Non-existent variables become "null"
+      expect(parsed.templateTests.inject).toBe(''); // Non-existent variables become "null"
     });
   });
 });

test/cases/service/core/app/workflow/dispatch/utils.test.ts

@@ -311,109 +311,3 @@ describe('valueTypeFormat', () => {
   //   });
   // });
 });
-
-import { getHistories } from '@fastgpt/service/core/workflow/dispatch/utils';
-import { ChatItemValueTypeEnum, ChatRoleEnum } from '@fastgpt/global/core/chat/constants';
-import type { ChatItemType } from '@fastgpt/global/core/chat/type';
-
-describe('getHistories test', async () => {
-  const MockHistories: ChatItemType[] = [
-    {
-      obj: ChatRoleEnum.System,
-      value: [
-        {
-          type: ChatItemValueTypeEnum.text,
-          text: {
-            content: '你好'
-          }
-        }
-      ]
-    },
-    {
-      obj: ChatRoleEnum.Human,
-      value: [
-        {
-          type: ChatItemValueTypeEnum.text,
-          text: {
-            content: '你好'
-          }
-        }
-      ]
-    },
-    {
-      obj: ChatRoleEnum.AI,
-      value: [
-        {
-          type: ChatItemValueTypeEnum.text,
-          text: {
-            content: '你好2'
-          }
-        }
-      ]
-    },
-    {
-      obj: ChatRoleEnum.Human,
-      value: [
-        {
-          type: ChatItemValueTypeEnum.text,
-          text: {
-            content: '你好3'
-          }
-        }
-      ]
-    },
-    {
-      obj: ChatRoleEnum.AI,
-      value: [
-        {
-          type: ChatItemValueTypeEnum.text,
-          text: {
-            content: '你好4'
-          }
-        }
-      ]
-    }
-  ];
-
-  it('getHistories', async () => {
-    // Number
-    expect(getHistories(1, MockHistories)).toEqual([
-      ...MockHistories.slice(0, 1),
-      ...MockHistories.slice(-2)
-    ]);
-    expect(getHistories(2, MockHistories)).toEqual([...MockHistories.slice(0)]);
-    expect(getHistories(4, MockHistories)).toEqual([...MockHistories.slice(0)]);
-
-    // Array
-    expect(
-      getHistories(
-        [
-          {
-            obj: ChatRoleEnum.Human,
-            value: [
-              {
-                type: ChatItemValueTypeEnum.text,
-                text: {
-                  content: '你好'
-                }
-              }
-            ]
-          }
-        ],
-        MockHistories
-      )
-    ).toEqual([
-      {
-        obj: ChatRoleEnum.Human,
-        value: [
-          {
-            type: ChatItemValueTypeEnum.text,
-            text: {
-              content: '你好'
-            }
-          }
-        ]
-      }
-    ]);
-  });
-});