Add tests for examples from Nim in Action.

tests/niminaction/Chapter6/WikipediaStats/sequential_counts.nim

@@ -0,0 +1,34 @@
+import os, parseutils
+
+proc parse(line: string, domainCode, pageTitle: var string,
+    countViews, totalSize: var int) =
+  var i = 0
+  domainCode.setLen(0)
+  i.inc parseUntil(line, domainCode, {' '}, i)
+  i.inc
+  pageTitle.setLen(0)
+  i.inc parseUntil(line, pageTitle, {' '}, i)
+  i.inc
+  countViews = 0
+  i.inc parseInt(line, countViews, i)
+  i.inc
+  totalSize = 0
+  i.inc parseInt(line, totalSize, i)
+
+proc readPageCounts(filename: string) =
+  var domainCode = ""
+  var pageTitle = ""
+  var countViews = 0
+  var totalSize = 0
+  var mostPopular = ("", "", 0, 0)
+  for line in filename.lines:
+    parse(line, domainCode, pageTitle, countViews, totalSize)
+    if domainCode == "en" and countViews > mostPopular[2]:
+      mostPopular = (domainCode, pageTitle, countViews, totalSize)
+
+  echo("Most popular is: ", mostPopular)
+
+when isMainModule:
+  const file = "pagecounts-20160101-050000"
+  let filename = getCurrentDir() / file
+  readPageCounts(filename)