tools: add test for VDOC_SORT=false ./v doc file.v

cmd/tools/vdoc/tests/testdata/unsorted/main.out

@@ -0,0 +1,8 @@
+module main
+
+const omega = 3 // should be first
+const alpha = 5 // should be in the middle
+const beta = 2 // should be at the end
+fn abc()
+fn def()
+fn xyz()

cmd/tools/vdoc/tests/testdata/unsorted/main.unsorted.out

@@ -0,0 +1,11 @@
+module main
+
+const omega = 3 // should be first
+const alpha = 5 // should be in the middle
+const beta = 2 // should be at the end
+fn def()
+    def - should be first
+fn xyz()
+    xyz - should be in the middle
+fn abc()
+    abc - should be last

cmd/tools/vdoc/tests/testdata/unsorted/main.v

@@ -0,0 +1,20 @@
+pub const omega = 3 // should be first
+
+pub const alpha = 5 // should be in the middle
+
+pub const beta = 2 // should be at the end
+
+// def - should be first
+pub fn def() {
+	println(1)
+}
+
+// xyz - should be in the middle
+pub fn xyz() {
+	println(2)
+}
+
+// abc - should be last
+pub fn abc() {
+	println(3)
+}