================
@@ -0,0 +1,8 @@
+// The test doesn't run in a PTY, so "auto" defaults to off.
----------------
Maetveis wrote:

Similarly here I think its enough to check that the option is accepted, no real 
need to verify what it does.

```c
// RUN: %clang_dxc \
// RUN: -fcolor-diagnostics \
// RUN: -fno-color-diagnostics \
// RUN: -fdiagnostics-color \
// RUN: -fno-diagnostics-color \
// RUN: -fdiagnostics-color=auto \
// RUN: -Tlib_6_7 -Vd -fdriver-only -- %s 2>&1 | count 0
```

(Might as well test all the other color flags while at it too).
(`-fdriver-only` and `count 0` should make sure we don't get any warnings not 
just errors).

Also NIT: Make sure to have a final newline in the file.

https://github.com/llvm/llvm-project/pull/120644
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