Fix output in our test suite sometimes getting colors

Author: oli-obk

tests/integrations/dep-fail/Cargo.stdout

@@ -7,10 +7,9 @@ Building dependencies ... FAILED
 tests/ui/basic_test.rs ... FAILED
 
 FAILED TEST: tests/ui/basic_test.rs
-command: "$CMD" "build" "--target-dir" "$DIR/tests/integrations/dep-fail/target/ui/0" "--manifest-path" "tested_crate/Cargo.toml"  "--message-format=json"
+command: "$CMD" "build" "--color=never" "--quiet" "--jobs" "1" "--target-dir" "$DIR/tests/integrations/dep-fail/target/ui/0" "--manifest-path" "tested_crate/Cargo.toml"  "--message-format=json"
 
 full stderr:
-   Compiling tested_crate v0.1.0-dev ($DIR/tests/integrations/dep-fail/tested_crate)
 error: could not compile `tested_crate` (lib) due to 1 previous error
 
 full stdout:

tests/integrations/dep-fail/tests/ui.rs

@@ -1,6 +1,6 @@
 use ui_test::{
     default_file_filter, default_per_file_config, dependencies::DependencyBuilder,
-    run_tests_generic, status_emitter::Text, Args, Config,
+    run_tests_generic, status_emitter::Text, Args, CommandBuilder, Config,
 };
 
 fn main() -> ui_test::Result<()> {
@@ -12,6 +12,10 @@ fn main() -> ui_test::Result<()> {
         "dependencies",
         DependencyBuilder {
             crate_manifest_path: "tested_crate/Cargo.toml".into(),
+            // Since this is run in CI and locally we need to hide all output
+            // which the default cargo build does. Users usually don't record the
+            // output of ui_test itself, so they don't encounter this.
+            program: CommandBuilder::cargo(),
             ..DependencyBuilder::default()
         },
     );