Adding upstream version 0.8.9.

Signed-off-by: Daniel Baumann <daniel@debian.org>

internal/dedupe/dedupe_test.go

@@ -0,0 +1,41 @@
+package dedupe_test
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/nicholas-fedor/shoutrrr/internal/dedupe"
+)
+
+func TestRemoveDuplicates(t *testing.T) {
+	tests := map[string]struct {
+		input []string
+		want  []string
+	}{
+		"no duplicates": {
+			input: []string{"a", "b", "c"},
+			want:  []string{"a", "b", "c"},
+		},
+		"duplicate inside slice": {
+			input: []string{"a", "b", "a", "c"},
+			want:  []string{"a", "b", "c"},
+		},
+		"duplicate at end of slice": {
+			input: []string{"a", "b", "c", "a"},
+			want:  []string{"a", "b", "c"},
+		},
+		"duplicate next to each other inside slice": {
+			input: []string{"a", "b", "b", "c"},
+			want:  []string{"a", "b", "c"},
+		},
+	}
+
+	for name, tc := range tests {
+		t.Run(name, func(t *testing.T) {
+			got := dedupe.RemoveDuplicates(tc.input)
+			if !reflect.DeepEqual(tc.want, got) {
+				t.Fatalf("expected: %#v, got: %#v", tc.want, got)
+			}
+		})
+	}
+}