Use single threads for testing

Susurrus · Susurrus · commit d2508e3a447b · 2017-07-03T12:45:07.000-07:00
I actually couldn't find a reference to CARGO_TEST_THREADS in the
current cargo codebase, but RUST_TEST_THREADS is definitely correct.
This should reduce some spurious failures on some platforms.
diff --git a/.travis.yml b/.travis.yml
@@ -9,7 +9,7 @@ sudo: required
 env:
   global:
     - CRATE_NAME=nix
-    - CARGO_TEST_THREADS=1
+    - RUST_TEST_THREADS=1
 
 matrix:
   # These are all the build jobs. Adjust as necessary. Comment out what you
diff --git a/Cross.toml b/Cross.toml
@@ -0,0 +1,2 @@
+[build.env]
+passthrough = ["RUST_TEST_THREADS"]

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+[build.env]`
	`2`	`+passthrough = ["RUST_TEST_THREADS"]`