Tests for Timer.sleep().

test/timer/sleep_fibers.wren

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+import "timer" for Timer
+
+Fiber.new {
+  Timer.sleep(2)
+  IO.print("a")
+}.call()
+
+Fiber.new {
+  Timer.sleep(1)
+  IO.print("b")
+}.call()
+
+IO.print("main")
+Timer.sleep(3)
+IO.print("done")
+// expect: main
+// expect: b
+// expect: a
+// expect: done

test/timer/sleep_float.wren

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+import "timer" for Timer
+
+// These are both rounded to 1, so "a" should complete first.
+Fiber.new {
+  Timer.sleep(1.5)
+  IO.print("a")
+}.call()
+
+Fiber.new {
+  Timer.sleep(1.3)
+  IO.print("b")
+}.call()
+
+IO.print("main")
+Timer.sleep(3)
+IO.print("done")
+// expect: main
+// expect: a
+// expect: b
+// expect: done

test/timer/sleep_main_fiber.wren

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+import "timer" for Timer
+
+IO.print("1") // expect: 1
+Timer.sleep(3)
+IO.print("2") // expect: 2
+Timer.sleep(3)
+IO.print("3") // expect: 3
+Timer.sleep(3)
+IO.print("4") // expect: 4

test/timer/sleep_negative.wren

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+import "timer" for Timer
+
+Timer.sleep(-1) // expect runtime error: Milliseconds cannot be negative.

test/timer/sleep_not_num.wren

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+import "timer" for Timer
+
+Timer.sleep("wat") // expect runtime error: Milliseconds must be a number.

test/timer/sleep_zero.wren

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+import "timer" for Timer
+
+Fiber.new {
+  Timer.sleep(0)
+  IO.print("a")
+}.call()
+
+Fiber.new {
+  Timer.sleep(0)
+  IO.print("b")
+}.call()
+
+Fiber.new {
+  Timer.sleep(0)
+  IO.print("c")
+}.call()
+
+IO.print("main")
+Timer.sleep(0) // This is enough to let the other fiber run.
+IO.print("done")
+
+// expect: main
+// Run in the order they were enqueued.
+// expect: a
+// expect: b
+// expect: c
+// expect: done