Add unit tests

test/init.nim

@@ -0,0 +1,26 @@
+import unittest
+include nre
+
+suite "Test NRE initialization":
+  test "correct intialization":
+    check(initRegex("[0-9]+") != nil)
+    check(initRegex("[0-9]+", "iS") != nil)
+
+  test "correct options":
+    expect(SyntaxError):  # ValueError would be bad
+      discard initRegex("[0-9]+",
+        "89?AEfiJmNOsUWXxY<any><anycrlf><cr><crlf><lf><bsr_anycrlf><bsr_unicode><js>")
+
+  test "incorrect options":
+    expect(KeyError): discard initRegex("[0-9]+", "a")
+    expect(KeyError): discard initRegex("[0-9]+", "<does_not_exist>")
+
+  test "invalid regex":
+    expect(SyntaxError): discard initRegex("[0-9")
+    try:
+      discard initRegex("[0-9")
+    except SyntaxError:
+      let ex = SyntaxError(getCurrentException())
+      check(ex.pos == 4)
+      check(ex.pattern == "[0-9")
+

test/testall.nim

@@ -0,0 +1 @@
+include init