Added integration tests

internal/integrationtest/compile_4/broken_symlink_test.go

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+// This file is part of arduino-cli.
+//
+// Copyright 2023 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to [email protected].
+
+package compile_test
+
+import (
+	"testing"
+
+	"github.com/arduino/arduino-cli/internal/integrationtest"
+	"github.com/arduino/go-paths-helper"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCompileWithBrokenSymLinks(t *testing.T) {
+	env, cli := integrationtest.CreateArduinoCLIWithEnvironment(t)
+	t.Cleanup(env.CleanUp)
+
+	// Install Arduino AVR Boards
+	_, _, err := cli.Run("core", "install", "arduino:[email protected]")
+	require.NoError(t, err)
+
+	t.Run("NonSketchFileBroken", func(t *testing.T) {
+		sketch, err := paths.New("testdata", "ValidSketchWithBrokenSymlink").Abs()
+		require.NoError(t, err)
+		_, _, err = cli.Run("compile", "-b", "arduino:avr:uno", sketch.String())
+		require.NoError(t, err)
+	})
+
+	t.Run("SketchFileBroken", func(t *testing.T) {
+		sketch, err := paths.New("testdata", "ValidSketchWithBrokenSketchFileSymlink").Abs()
+		require.NoError(t, err)
+		_, _, err = cli.Run("compile", "-b", "arduino:avr:uno", sketch.String())
+		require.Error(t, err)
+	})
+
+	t.Run("NonInoSketchFileBroken", func(t *testing.T) {
+		sketch, err := paths.New("testdata", "ValidSketchWithNonInoBrokenSketchFileSymlink").Abs()
+		require.NoError(t, err)
+		_, _, err = cli.Run("compile", "-b", "arduino:avr:uno", sketch.String())
+		require.Error(t, err)
+	})
+}

internal/integrationtest/compile_4/testdata/ValidSketchWithBrokenSketchFileSymlink/ValidSketchWithBrokenSketchFileSymlink.ino

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+void setup() {}
+void loop() {}

internal/integrationtest/compile_4/testdata/ValidSketchWithBrokenSketchFileSymlink/other_file.ino

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+broken

internal/integrationtest/compile_4/testdata/ValidSketchWithBrokenSymlink/ValidSketchWithBrokenSymlink.ino

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+void setup() {}
+void loop() {}

internal/integrationtest/compile_4/testdata/ValidSketchWithBrokenSymlink/other_file

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+broken

internal/integrationtest/compile_4/testdata/ValidSketchWithNonInoBrokenSketchFileSymlink/ValidSketchWithNonInoBrokenSketchFileSymlink.ino

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+void setup() {}
+void loop() {}

internal/integrationtest/compile_4/testdata/ValidSketchWithNonInoBrokenSketchFileSymlink/other_file.c

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+broken