refactor: move benchmark directory under test and update all references

The benchmark directory is relocated from the project root into the test directory, and all scripts, documentation links, and gitignore paths are updated accordingly. The test runner is also refactored to explicitly walk subdirectories (core, io, language, limit) instead of using a single test root, and a new test/README.md is added to document the test suite structure. Additionally, the constructor test for the Foo class is updated to add a zero-arity constructor and adjust expected output strings.

test/language/for/close_over_loop_variable.wren

@@ -0,0 +1,10 @@
+var list = []
+
+for (i in [1, 2, 3]) {
+  list.add(new Fn { IO.print(i) })
+}
+
+for (f in list) f.call()
+// expect: 1
+// expect: 2
+// expect: 3

test/language/for/closure_in_body.wren

@@ -0,0 +1,11 @@
+var list = []
+
+for (i in [1, 2, 3]) {
+  var j = i + 1
+  list.add(new Fn { IO.print(j) })
+}
+
+for (f in list) f.call()
+// expect: 2
+// expect: 3
+// expect: 4

test/language/for/newline_after_for.wren

@@ -0,0 +1,2 @@
+for // expect error
+(i in [1, 2, 3]) IO.print(i)

test/language/for/newline_before_in.wren

@@ -0,0 +1,2 @@
+for (i // expect error
+  in [1]) IO.print(i)

test/language/for/only_evaluate_sequence_once.wren

@@ -0,0 +1,10 @@
+var f = new Fn {
+  IO.print("evaluate sequence")
+  return [1, 2, 3]
+}
+
+for (i in f.call()) IO.print(i)
+// expect: evaluate sequence
+// expect: 1
+// expect: 2
+// expect: 3

test/language/for/return_closure.wren

@@ -0,0 +1,9 @@
+var f = new Fn {
+  for (i in [1, 2, 3]) {
+    return new Fn { IO.print(i) }
+  }
+}
+
+var g = f.call()
+g.call()
+// expect: 1

test/language/for/return_inside.wren

@@ -0,0 +1,8 @@
+var f = new Fn {
+  for (i in [1, 2, 3]) {
+    return i
+  }
+}
+
+IO.print(f.call())
+// expect: 1

test/language/for/syntax.wren

@@ -0,0 +1,14 @@
+// Single-expression body.
+for (i in [1]) IO.print(i)
+// expect: 1
+
+// Block body.
+for (i in [1]) {
+  IO.print(i)
+}
+// expect: 1
+
+// Newline after "in".
+for (i in
+  [1]) IO.print(i)
+// expect: 1

test/language/for/truth.wren

@@ -0,0 +1,32 @@
+class Iter {
+  new(value) { _value = value }
+  iterate(iterator) { _value }
+  iteratorValue(iterator) { "value" }
+}
+
+// False and null are false.
+for (n in new Iter(false)) {
+  IO.print("bad")
+  break
+}
+
+for (n in new Iter(null)) {
+  IO.print("bad")
+  break
+}
+
+// Everything else is true.
+for (n in new Iter(true)) {
+  IO.print("true") // expect: true
+  break
+}
+
+for (n in new Iter(0)) {
+  IO.print(0) // expect: 0
+  break
+}
+
+for (n in new Iter("")) {
+  IO.print("string") // expect: string
+  break
+}