add: info on reason-string maxLength chars

lib/rules/best-practises/reason-string.js

@@ -82,7 +82,12 @@ class ReasonStringChecker extends BaseChecker {
       // If has reason message and is too long, throw an error
       const reason = _.last(functionParameters).value
       if (reason.length > this.maxCharactersLong) {
-        this._errorMessageIsTooLong(node, functionName)
+        const infoMessage = reason.length
+          .toString()
+          .concat(' counted / ')
+          .concat(this.maxCharactersLong.toString())
+          .concat(' allowed')
+        this._errorMessageIsTooLong(node, functionName, infoMessage)
       }
     }
   }
@@ -103,8 +108,8 @@ class ReasonStringChecker extends BaseChecker {
     this.error(node, `Provide an error message for ${key}`)
   }
 
-  _errorMessageIsTooLong(node, key) {
-    this.error(node, `Error message for ${key} is too long`)
+  _errorMessageIsTooLong(node, key, infoMessage) {
+    this.error(node, `Error message for ${key} is too long: ${infoMessage}`)
   }
 }
 

test/rules/best-practises/reason-string.js

@@ -101,4 +101,25 @@ describe('Linter - reason-string', () => {
     assertNoWarnings(report)
     assertNoErrors(report)
   })
+
+  it('should raise reason string maxLength error with added data', () => {
+    const qtyChars = 'Roles: account already has role'.length
+    const maxLength = 5
+
+    const code = funcWith(`require(!has(role, account), "Roles: account already has role");
+        role.bearer[account] = true;role.bearer[account] = true;
+    `)
+
+    const report = linter.processStr(code, {
+      rules: { 'reason-string': ['warn', { maxLength: 5 }] },
+    })
+
+    assert.ok(report.warningCount > 0)
+    assertWarnsCount(report, 1)
+
+    assert.equal(
+      report.reports[0].message,
+      `Error message for require is too long: ${qtyChars} counted / ${maxLength} allowed`
+    )
+  })
 })