Fix issue ' cargo t --doc does not respect --color when a compilation error occurs #14403 '

Author: ShashiSugrim

src/cargo/ops/cargo_test.rs

@@ -1,5 +1,6 @@
 use crate::core::compiler::{Compilation, CompileKind, Doctest, Metadata, Unit, UnitOutput};
 use crate::core::profiles::PanicStrategy;
+use crate::core::shell::ColorChoice;
 use crate::core::shell::Verbosity;
 use crate::core::{TargetKind, Workspace};
 use crate::ops;
@@ -176,6 +177,7 @@ fn run_doc_tests(
     let gctx = ws.gctx();
     let mut errors = Vec::new();
     let doctest_xcompile = gctx.cli_unstable().doctest_xcompile;
+    let color = gctx.shell().color_choice();
 
     for doctest_info in &compilation.to_doc_test {
         let Doctest {
@@ -215,6 +217,14 @@ fn run_doc_tests(
         for (var, value) in env {
             p.env(var, value);
         }
+
+        let color_arg = match color {
+            ColorChoice::Always => "always",
+            ColorChoice::Never => "never",
+            ColorChoice::CargoAuto => "auto",
+        };
+        p.arg("--color").arg(color_arg);
+
         p.arg("--crate-name").arg(&unit.target.crate_name());
         p.arg("--test");
 

tests/testsuite/build_script.rs

@@ -2871,7 +2871,7 @@ fn env_test() {
 [RUNNING] `[ROOT]/foo/target/debug/deps/foo-[HASH][EXE]`
 [RUNNING] `[ROOT]/foo/target/debug/deps/test-[HASH][EXE]`
 [DOCTEST] foo
-[RUNNING] `rustdoc --edition=2015 --crate-type lib --crate-name foo[..]`
+[RUNNING] `rustdoc --edition=2015 --crate-type lib --color auto --crate-name foo[..]`
 
 "#]])
         .with_stdout_data(str![[r#"

tests/testsuite/lto.rs

@@ -619,7 +619,7 @@ fn cdylib_and_rlib() {
 [RUNNING] `[ROOT]/foo/target/release/deps/bar-[HASH][EXE]`
 [RUNNING] `[ROOT]/foo/target/release/deps/b-[HASH][EXE]`
 [DOCTEST] bar
-[RUNNING] `rustdoc --edition=2015 --crate-type cdylib --crate-type rlib --crate-name bar --test [..]-C lto [..]
+[RUNNING] `rustdoc --edition=2015 --crate-type cdylib --crate-type rlib --color auto --crate-name bar --test [..]-C lto [..]
 
 "#]].unordered())
         .run();

tests/testsuite/test.rs

@@ -5555,7 +5555,7 @@ fn cargo_test_print_env_verbose() {
 [FINISHED] `test` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 [RUNNING] `[..]CARGO_MANIFEST_DIR=[ROOT]/foo[..] [ROOT]/foo/target/debug/deps/foo-[HASH][EXE]`
 [DOCTEST] foo
-[RUNNING] `[..]CARGO_MANIFEST_DIR=[ROOT]/foo[..] rustdoc --edition=2015 --crate-type lib --crate-name foo[..]`
+[RUNNING] `[..]CARGO_MANIFEST_DIR=[ROOT]/foo[..] rustdoc --edition=2015 --crate-type lib --color auto --crate-name foo[..]`
 
 "#]]).run();
 }