Merge pull request arduino#752 from arduino/example-not-folder

Fix example file causing panic

Author: per1234

internal/project/project.go

@@ -193,7 +193,7 @@ func findSubprojects(superproject Type, apexSuperprojectType projecttype.Type) [
 	var immediateSubprojects []Type
 	for _, subprojectsFolderName := range subprojectsFolderNames {
 		subprojectsPath := superproject.Path.Join(subprojectsFolderName)
-		if subprojectsPath.Exist() {
+		if subprojectsPath.IsDir() {
 			directoryListing, err := subprojectsPath.ReadDir()
 			if err != nil {
 				panic(err)

internal/project/project_test.go

@@ -429,3 +429,19 @@ func TestFindProjects(t *testing.T) {
 		}
 	}
 }
+
+func TestExamplefile(t *testing.T) {
+	// Set up directory structure of test library.
+	libraryPath, err := paths.TempDir().MkTempDir("TestExampleFile")
+	defer libraryPath.RemoveAll() // Clean up after the test.
+	require.Nil(t, err)
+	err = libraryPath.Join("TestExample.h").WriteFile([]byte{})
+	require.Nil(t, err)
+	// Create an example file in the library folder. This should not cause a panic and should be ignored since it's not a folder containing the examples
+	err = libraryPath.Join("example").WriteFile([]byte{})
+	require.Nil(t, err)
+
+	configuration.Initialize(test.ConfigurationFlags(), []string{libraryPath.String()})
+
+	assert.NotPanics(t, func() { FindProjects() }, "Example file should not cause panic")
+}