Add RemoveDuplicates unit test

pkg/util/filter_test.go

@@ -0,0 +1,36 @@
+package util
+
+import "testing"
+
+func TestRemoveDuplicates(t *testing.T) {
+	type testT struct {
+		input  []string
+		output []string
+	}
+	tests := []testT{
+		{
+			input:  []string{"a"},
+			output: []string{"a"},
+		},
+		{
+			input:  []string{"a", "b"},
+			output: []string{"a", "b"},
+		},
+		{
+			input:  []string{"a", "a"},
+			output: []string{"a"},
+		},
+		{
+			input:  []string{"a", "b", "a", "a", "c"},
+			output: []string{"a", "b", "c"},
+		},
+	}
+	for _, test := range tests {
+		actualOutput := RemoveDuplicates(test.input)
+		if len(actualOutput) != len(test.output) ||
+			!EqualUnsorted(test.output, actualOutput) {
+			t.Errorf("returned %q for %q but expected %q", actualOutput, test.input, test.output)
+			continue
+		}
+	}
+}