Use shrinked output built into the test harness.

servo/rustc-test@e3a9adc

Also proposed upstream at rust-lang/rust#31887

Author: SimonSapin

Cargo.toml

@@ -27,7 +27,7 @@ harness = false
 name = "serializer"
 
 [features]
-unstable = ["tendril/unstable", "string_cache/unstable"]
+unstable = ["tendril/unstable", "string_cache/unstable", "rustc-test/capture"]
 heap_size = ["heapsize", "heapsize_plugin"]
 codegen = ["html5ever_macros"]
 
@@ -43,7 +43,7 @@ heapsize_plugin = { version = "0.1.0", optional = true }
 
 [dev-dependencies]
 rustc-serialize = "0.3.15"
-rustc-test = "0.1"
+rustc-test = "0.1.3"
 
 [build-dependencies]
 phf_codegen = "0.7.3"

scripts/shrink-test-output.py

@@ -10,12 +10,11 @@
 
 set -ex
 
-./scripts/shrink-test-output.py cargo test --color always
+cargo test
 
 if [ $TRAVIS_RUST_VERSION = nightly ]
 then
-    ./scripts/shrink-test-output.py cargo test --color always --features unstable
-
+    cargo test --features unstable
     cargo test --manifest-path capi/Cargo.toml
 fi