Added test showcasing the output of RPC failures

Signed-off-by: Ambre Austen Suhamy <[email protected]>

Author: ElectreAAS

test/blackbox-tests/test-cases/watching/multiple-errors-output.t/dune-project

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+(lang dune 3.8)

test/blackbox-tests/test-cases/watching/multiple-errors-output.t/libs/bar.ml

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+let y = "type error" + 3

test/blackbox-tests/test-cases/watching/multiple-errors-output.t/libs/baz.ml

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+let y = "unknown variable" ^ what

test/blackbox-tests/test-cases/watching/multiple-errors-output.t/libs/dune

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+(library
+ (name bar)
+ (modules bar))
+
+(library
+ (name baz)
+ (modules baz))

test/blackbox-tests/test-cases/watching/multiple-errors-output.t/run.t

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+We test the output of the watch mode client when we have multiple errors
+
+  $ . ../helpers.sh
+
+  $ start_dune
+
+  $ dune rpc ping --wait
+  Server appears to be responding normally
+
+  $ dune build
+  File "$TESTCASE_ROOT/libs/bar.ml", line 1, characters 8-20:
+  1 | let y = "type error" + 3
+              ^^^^^^^^^^^^
+  This constant has type string but an expression was expected of type
+    int
+  File "$TESTCASE_ROOT/libs/baz.ml", line 1, characters 29-33:
+  1 | let y = "unknown variable" ^ what
+                                   ^^^^
+  Unbound value what
+  Build failed with 2 errors.
+
+  $ stop_dune
+  File "libs/bar.ml", line 1, characters 8-20:
+  1 | let y = "type error" + 3
+              ^^^^^^^^^^^^
+  Error: This constant has type string but an expression was expected of type
+           int
+  File "libs/baz.ml", line 1, characters 29-33:
+  1 | let y = "unknown variable" ^ what
+                                   ^^^^
+  Error: Unbound value what
+  Had 2 errors, waiting for filesystem changes...

test/blackbox-tests/test-cases/watching/multiple-errors-output.t/src/dune

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+(executable
+ (name foo)
+ (libraries bar baz))

test/blackbox-tests/test-cases/watching/multiple-errors-output.t/src/foo.ml

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+let f = Bar.x + Baz.y + invalid_syntax : ? = !