Add unit test for tranform function

src/cli/__tests__/engine.spec.ts

@@ -147,4 +147,24 @@ describe('Engine', () => {
 
     expect(result).toBeNull();
   });
+
+  it('returns masked string', () => {
+    const engine = new Engine();
+
+    engine.aoo = {
+      tables: {},
+    };
+
+    engine.cache = {
+      tableName: 'users',
+      columns: ['name', 'description', 'id'],
+      transformers: {
+        description: () => 'This will be used',
+      },
+    };
+
+    const result = engine.transform(`Hello\tThis is coder\t3`);
+
+    expect(result).toEqual('Hello\tThis will be used\t3');
+  });
 });

src/cli/engine.ts

@@ -147,7 +147,7 @@ class Engine {
     return true;
   }
 
-  #transform(line: string) {
+  transform(line: string) {
     if (!(this.cache?.transformers || this.aoo.defaultTransformer)) return line;
     if (!line.trim() || line === `\\.`) return line;
 
@@ -160,18 +160,18 @@ class Engine {
       const [middleware, mapping] = transformers;
       const passedRecord = middleware(record, columns!);
       if (passedRecord) {
-        maskedData = this.#declarativeTransformation(passedRecord, mapping);
+        maskedData = this.declarativeTransformation(passedRecord, mapping);
       } else {
         maskedData = record;
       }
     } else {
-      maskedData = this.#declarativeTransformation(record, transformers!);
+      maskedData = this.declarativeTransformation(record, transformers!);
     }
 
     return maskedData.join(`\t`);
   }
 
-  #declarativeTransformation(record: string[], transformers: ColumnTypes): string[] {
+  declarativeTransformation(record: string[], transformers: ColumnTypes): string[] {
     const columns = this.cache?.columns;
     return record.map((value: String, index: number) => {
       if (transformers?.hasOwnProperty(columns![index])) {
@@ -215,7 +215,7 @@ class Engine {
           /*
             Query data in progress
           */
-          line = this.#transform(line);
+          line = this.transform(line);
         }
       }