Add full test for rustdoc map file

Author: GuillaumeGomez

src/test/run-make-fulldeps/rustdoc-map-file/Makefile

@@ -0,0 +1,5 @@
+-include ../tools.mk
+
+all:
+	$(RUSTDOC) -Z unstable-options --generate-redirect-map foo.rs -o "$(TMPDIR)/out"
+	"$(PYTHON)" validate_json.py "$(TMPDIR)/out"

src/test/run-make-fulldeps/rustdoc-map-file/expected.json

@@ -0,0 +1,5 @@
+{
+  "foo/macro.foo!.html": "foo/macro.foo.html",
+  "foo/private/struct.Quz.html": "foo/struct.Quz.html",
+  "foo/hidden/struct.Bar.html": "foo/struct.Bar.html"
+}

src/test/run-make-fulldeps/rustdoc-map-file/foo.rs

@@ -0,0 +1,16 @@
+pub use private::Quz;
+pub use hidden::Bar;
+
+mod private {
+    pub struct Quz;
+}
+
+#[doc(hidden)]
+pub mod hidden {
+    pub struct Bar;
+}
+
+#[macro_export]
+macro_rules! foo {
+    () => {}
+}

src/test/run-make-fulldeps/rustdoc-map-file/validate_json.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+
+import os
+import sys
+import json
+
+
+def find_redirect_map_file(folder, errors):
+    for root, dirs, files in os.walk(folder):
+        for name in files:
+            if not name.endswith("redirect-map.json"):
+                continue
+            with open(os.path.join(root, name)) as f:
+                data = json.load(f)
+            with open("expected.json") as f:
+                expected = json.load(f)
+            for key in expected:
+                if expected[key] != data.get(key):
+                    errors.append("Expected `{}` for key `{}`, found: `{}`".format(
+                        expected[key], key, data.get(key)))
+                else:
+                    del data[key]
+            for key in data:
+                errors.append("Extra data not expected: key: `{}`, data: `{}`".format(
+                    key, data[key]))
+            return True
+    return False
+
+
+if len(sys.argv) != 2:
+    print("Expected doc directory to check!")
+    sys.exit(1)
+
+errors = []
+if not find_redirect_map_file(sys.argv[1], errors):
+    print("Didn't find the map file in `{}`...".format(sys.argv[1]))
+    sys.exit(1)
+for err in errors:
+    print("=> {}".format(err))
+if len(errors) != 0:
+    sys.exit(1)