Test cases for fast mode; preview fix

papaparse.js

@@ -1115,7 +1115,10 @@
 					else
 						data.push(rows[i].split(delim));
 					if (preview && i >= preview)
+					{
+						data = data.slice(0, preview);
 						return returnable(true);
+					}
 				}
 				return returnable();
 			}

tests/test-cases.js

@@ -343,6 +343,42 @@ var CORE_PARSER_TESTS = [
 			data: [['a'], ['b'], [''], [''], ['c'], ['d'], ['e'], ['']],
 			errors: []
 		}
+	},
+	{
+		description: "Fast mode, basic",
+		input: 'a,b,c\nd,e,f',
+		config: { fastMode: true },
+		expected: {
+			data: [['a', 'b', 'c'], ['d', 'e', 'f']],
+			errors: []
+		}
+	},
+	{
+		description: "Fast mode with comments",
+		input: '// Commented line\na,b,c',
+		config: { fastMode: true, comments: "//" },
+		expected: {
+			data: [['a', 'b', 'c']],
+			errors: []
+		}
+	},
+	{
+		description: "Fast mode with preview",
+		input: 'a,b,c\nd,e,f\nh,j,i\n',
+		config: { fastMode: true, preview: 2 },
+		expected: {
+			data: [['a', 'b', 'c'], ['d', 'e', 'f']],
+			errors: []
+		}
+	},
+	{
+		description: "Fast mode with blank line at end",
+		input: 'a,b,c\n',
+		config: { fastMode: true },
+		expected: {
+			data: [['a', 'b', 'c'], ['']],
+			errors: []
+		}
 	}
 ];