Gave all modules own directory; added test CI pipeline

.woodpecker/.test.yml

@@ -0,0 +1,15 @@
+matrix:
+  PLATFORM:
+    - linux/amd64
+    - linux/arm64
+
+platform: ${PLATFORM}
+
+pipeline:
+  test:
+    image: 'chewingbever/vlang:latest'
+    pull: true
+    commands:
+      - make test
+    when:
+      event: push

src/cron/cron.v

@@ -27,6 +27,6 @@ pub fn cron(conf Config) ? {
 	// }
 
 	// println(queue)
-	exp := "10/2 5 *"
+	exp := '10/2 5 *'
 	println(parse_expression(exp) ?)
 }

src/cron/expression.v

@@ -44,7 +44,7 @@ fn parse_expression(exp string) ?CronExpression {
 	parts := exp.split(' ')
 
 	if parts.len != 3 {
-		return error("Expression must contain 5 space-separated parts.")
+		return error('Expression must contain 5 space-separated parts.')
 	}
 
 	return CronExpression{

src/cron/expression_test.v

@@ -1,5 +1,9 @@
 module cron
 
-fn test_parse_star_range() {
-	assert parse_range('*', 0, 5) == [0, 1, 2, 3, 4, 5]
+fn test_parse_star_range() ? {
+	assert parse_range('*', 0, 5) ? == [u32(0), 1, 2, 3, 4, 5]
+}
+
+fn test_parse_number() ? {
+	assert parse_range('4', 0, 5) ? == [u32(4)]
 }