Merge pull request apache#352 from gbidsilva/CSV-310

[CSV-310] Misleading error message when QuoteMode set to None

Author: garydgregory

src/main/java/org/apache/commons/csv/CSVFormat.java

@@ -2449,7 +2449,7 @@ private void validate() throws IllegalArgumentException {
         }
 
         if (escapeCharacter == null && quoteMode == QuoteMode.NONE) {
-            throw new IllegalArgumentException("No quotes mode set but no escape character is set");
+            throw new IllegalArgumentException("Quote mode set to NONE but no escape character is set");
         }
 
         // Validate headers

src/test/java/org/apache/commons/csv/CSVFormatTest.java

@@ -1477,4 +1477,17 @@ public void testWithSystemRecordSeparator() {
         final CSVFormat formatWithRecordSeparator = CSVFormat.DEFAULT.withSystemRecordSeparator();
         assertEquals(System.lineSeparator(), formatWithRecordSeparator.getRecordSeparator());
     }
+
+    @Test
+    public void testQuoteModeNoneShouldReturnMeaningfulExceptionMessage() {
+        Exception exception = assertThrows(IllegalArgumentException.class, () -> {
+            CSVFormat.DEFAULT.builder()
+                    .setHeader("Col1", "Col2", "Col3", "Col4")
+                    .setQuoteMode(QuoteMode.NONE)
+                    .build();
+        });
+        String actualMessage = exception.getMessage();
+        String expectedMessage = "Quote mode set to NONE but no escape character is set";
+        assertEquals(expectedMessage, actualMessage);
+    }
 }