feat(nullVars): add SAS null vars support

src/utils/convertToCsv.spec.ts

@@ -167,4 +167,42 @@ describe('convertToCsv', () => {
       convertToCSV([{ slashWithSpecialExtra: '\\\ts\tl\ta\ts\t\th\t' }])
     ).toEqual(`slashWithSpecialExtra:$char13.\r\n\"\\\ts\tl\ta\ts\t\th\t\"`)
   })
+
+  it('should convert not null values', () => {
+    const data = [
+      { var1: 'string', nullvar: 'A', var2: 232 },
+      { var1: 'string', nullvar: 'B', var2: 232 },
+      { var1: 'string', nullvar: '_', var2: 232 },
+      { var1: 'string', nullvar: 0, var2: 232 },
+      { var1: 'string', nullvar: 'z', var2: 232 },
+      { var1: 'string', nullvar: null, var2: 232 }
+    ]
+
+    const expectedOutput = `var1:$char6. nullvar:best. var2:best.\r\nstring,.a,232\r\nstring,.b,232\r\nstring,._,232\r\nstring,0,232\r\nstring,.z,232\r\nstring,.,232`
+
+    expect(
+      convertToCSV(data, {
+        formats: { var1: '$char6.', nullvar: 'best.' }
+      })
+    ).toEqual(expectedOutput)
+  })
+
+  it('should return error if string is more than maxFieldValue', () => {
+    const data = [{ var1: 'z'.repeat(32765 + 1) }]
+
+    expect(convertToCSV(data)).toEqual('ERROR: LARGE STRING LENGTH')
+  })
+
+  it('should console log error if data has mixed types', () => {
+    const colName = 'var1'
+    const data = [{ [colName]: 'string' }, { [colName]: 232 }]
+
+    jest.spyOn(console, 'error').mockImplementation(() => {})
+
+    convertToCSV(data)
+
+    expect(console.error).toHaveBeenCalledWith(
+      `Row (2), Column (${colName}) has mixed types: ERROR`
+    )
+  })
 })