diff --git a/x/globalfee/types/params_test.go b/x/globalfee/types/params_test.go
new file mode 100644
index 0000000000..68c31522be
--- /dev/null
+++ b/x/globalfee/types/params_test.go
@@ -0,0 +1,62 @@
+package types
+
+import (
+	"cosmossdk.io/math"
+	"testing"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDefaultParams(t *testing.T) {
+	p := DefaultParams()
+	require.EqualValues(t, p.MinimumGasPrices, sdk.DecCoins{})
+}
+
+func Test_validateParams(t *testing.T) {
+	tests := map[string]struct {
+		coins     interface{} // not sdk.DeCoins, but Decoins defined in glboalfee
+		expectErr bool
+	}{
+		"DefaultParams, pass": {
+			DefaultParams().MinimumGasPrices,
+			false,
+		},
+		"DecCoins conversion fails, fail": {
+			sdk.Coins{sdk.NewCoin("photon", math.OneInt())},
+			true,
+		},
+		"coins amounts are zero, pass": {
+			sdk.DecCoins{
+				sdk.NewDecCoin("atom", math.ZeroInt()),
+				sdk.NewDecCoin("photon", math.ZeroInt()),
+			},
+			false,
+		},
+		"duplicate coins denoms, fail": {
+			sdk.DecCoins{
+				sdk.NewDecCoin("photon", math.OneInt()),
+				sdk.NewDecCoin("photon", math.OneInt()),
+			},
+			true,
+		},
+		"coins are not sorted by denom alphabetically, fail": {
+			sdk.DecCoins{
+				sdk.NewDecCoin("photon", math.OneInt()),
+				sdk.NewDecCoin("atom", math.OneInt()),
+			},
+			true,
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			err := validateMinimumGasPrices(test.coins)
+			if test.expectErr {
+				require.Error(t, err)	
+				return
+			}
+			require.NoError(t, err)
+		})
+	}
+}