config: add reprovider options test.

This is a left over from previous PR as I forgot to check it in.

config/reprovider_test.go

@@ -0,0 +1,28 @@
+package config
+
+import "testing"
+
+func TestParseReproviderStrategy(t *testing.T) {
+	tests := []struct {
+		input  string
+		expect ReproviderStrategy
+	}{
+		{"all", ReproviderStrategyAll},
+		{"flat", ReproviderStrategyFlat},
+		{"pinned", ReproviderStrategyPinned},
+		{"mfs", ReproviderStrategyMFS},
+		{"flat+pinned", ReproviderStrategyFlat | ReproviderStrategyPinned},
+		{"pinned+mfs", ReproviderStrategyPinned | ReproviderStrategyMFS},
+		{"invalid", 0},
+		{"all+invalid", ReproviderStrategyAll},
+		{"", ReproviderStrategyAll},
+		{"flat+all", ReproviderStrategyAll},
+	}
+
+	for _, tt := range tests {
+		result := ParseReproviderStrategy(tt.input)
+		if result != tt.expect {
+			t.Errorf("ParseReproviderStrategy(%q) = %d, want %d", tt.input, result, tt.expect)
+		}
+	}
+}