simplify streams, lint docs

stream/tests/test-scan.js

@@ -0,0 +1,78 @@
+"use strict"
+
+var o = require("../../ospec/ospec")
+var stream = require("../stream")
+var scan = require("../scan")
+
+o.spec("scan", function() {
+	o("defaults to seed", function() {
+		var parent = stream()
+		var child = scan(function(out, p) {
+			return out - p
+		}, 123, parent)
+		o(child()).equals(123)
+	})
+
+	o("accumulates values as expected", function() {
+		var parent = stream()
+		var child = scan(function(arr, p) {
+			return arr.concat(p)
+		}, [], parent)
+
+		parent(7)
+		parent("11")
+		parent(undefined)
+		parent({ a: 1 })
+		var result = child()
+
+		// deepEquals fails on arrays?
+		o(result[0]).equals(7)
+		o(result[1]).equals("11")
+		o(result[2]).equals(undefined)
+		o(result[3]).deepEquals({a: 1})
+	})
+})
+
+o.spec("scanMerge", function() {
+	var scanMerge
+
+	o.beforeEach(function() {
+		scanMerge = require("../scan-merge")
+	})
+
+	o("defaults to seed", function() {
+		var parent1 = stream()
+		var parent2 = stream()
+
+		var child = scanMerge([
+			[parent1, function(out, p1) {
+				return out + p1
+			}],
+			[parent2, function(out, p2) {
+				return out + p2
+			}]
+		], -10)
+
+		o(child()).equals(-10)
+	})
+
+	o("accumulates as expected", function() {
+		var parent1 = stream()
+		var parent2 = stream()
+
+		var child = scanMerge([
+			[parent1, function(out, p1) {
+				return out + p1
+			}],
+			[parent2, function(out, p2) {
+				return out + p2 + p2
+			}]
+		], "a")
+
+		parent1("b")
+		parent2("c")
+		parent1("b")
+
+		o(child()).equals("abccb")
+	})
+})