From 157ed9f79a55212ac9c39b0c3aa3534c6411b45e Mon Sep 17 00:00:00 2001
From: Eric Huss <eric@huss.org>
Date: Tue, 15 Sep 2020 14:22:19 -0700
Subject: [PATCH] Add test for whitespace behavior in env flags.

---
 tests/testsuite/rustdocflags.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tests/testsuite/rustdocflags.rs b/tests/testsuite/rustdocflags.rs
index 5a15c446cad..ebe8b31090c 100644
--- a/tests/testsuite/rustdocflags.rs
+++ b/tests/testsuite/rustdocflags.rs
@@ -97,3 +97,27 @@ fn rustdocflags_misspelled() {
         .with_stderr_contains("[WARNING] Cargo does not read `RUSTDOC_FLAGS` environment variable. Did you mean `RUSTDOCFLAGS`?")
         .run();
 }
+
+#[cargo_test]
+fn whitespace() {
+    // Checks behavior of different whitespace characters.
+    let p = project().file("src/lib.rs", "").build();
+
+    // "too many operands"
+    p.cargo("doc")
+        .env("RUSTDOCFLAGS", "--crate-version this has spaces")
+        .with_stderr_contains("[ERROR] could not document `foo`")
+        .with_status(101)
+        .run();
+
+    const SPACED_VERSION: &str = "a\nb\tc\u{00a0}d";
+    p.cargo("doc")
+        .env(
+            "RUSTDOCFLAGS",
+            format!("--crate-version {}", SPACED_VERSION),
+        )
+        .run();
+
+    let contents = p.read_file("target/doc/foo/index.html");
+    assert!(contents.contains(SPACED_VERSION));
+}