Scrub more environment variables from the test environment.

Author: ehuss

crates/cargo-test-support/src/lib.rs

@@ -1241,15 +1241,20 @@ pub trait TestEnv: Sized {
             // Don't read the system git config which is out of our control.
             .env("GIT_CONFIG_NOSYSTEM", "1")
             .env_remove("__CARGO_DEFAULT_LIB_METADATA")
+            .env_remove("ALL_PROXY")
             .env_remove("EMAIL")
             .env_remove("GIT_AUTHOR_EMAIL")
             .env_remove("GIT_AUTHOR_NAME")
             .env_remove("GIT_COMMITTER_EMAIL")
             .env_remove("GIT_COMMITTER_NAME")
+            .env_remove("http_proxy")
+            .env_remove("HTTPS_PROXY")
+            .env_remove("https_proxy")
             .env_remove("MAKEFLAGS")
             .env_remove("MFLAGS")
             .env_remove("MSYSTEM") // assume cmd.exe everywhere on windows
             .env_remove("RUSTC")
+            .env_remove("RUSTC_WORKSPACE_WRAPPER")
             .env_remove("RUSTC_WRAPPER")
             .env_remove("RUSTDOC")
             .env_remove("RUSTDOCFLAGS")