cli: add tests to cli packages

Closes #1336

cli/flags/fixed8_test.go

@@ -0,0 +1,66 @@
+package flags
+
+import (
+	"flag"
+	"io/ioutil"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFixed8_String(t *testing.T) {
+	value := util.Fixed8(123)
+	f := Fixed8{
+		Value: value,
+	}
+
+	require.Equal(t, "0.00000123", f.String())
+}
+
+func TestFixed8_Set(t *testing.T) {
+	value := util.Fixed8(123)
+	f := Fixed8{}
+
+	require.Error(t, f.Set("not-a-fixed8"))
+
+	require.NoError(t, f.Set("0.00000123"))
+	require.Equal(t, value, f.Value)
+}
+
+func TestFixed8_Fixed8(t *testing.T) {
+	f := Fixed8{
+		Value: util.Fixed8(123),
+	}
+
+	require.Equal(t, util.Fixed8(123), f.Fixed8())
+}
+
+func TestFixed8Flag_String(t *testing.T) {
+	flag := Fixed8Flag{
+		Name:  "myFlag",
+		Usage: "Gas amount",
+	}
+
+	require.Equal(t, "--myFlag value\tGas amount", flag.String())
+}
+
+func TestFixed8Flag_GetName(t *testing.T) {
+	flag := Fixed8Flag{
+		Name: "myFlag",
+	}
+
+	require.Equal(t, "myFlag", flag.GetName())
+}
+
+func TestFixed8(t *testing.T) {
+	f := flag.NewFlagSet("", flag.ContinueOnError)
+	f.SetOutput(ioutil.Discard) // don't pollute test output
+	gas := Fixed8Flag{Name: "gas, g"}
+	gas.Apply(f)
+	require.NoError(t, f.Parse([]string{"--gas", "0.123"}))
+	require.Equal(t, "0.123", f.Lookup("g").Value.String())
+	require.NoError(t, f.Parse([]string{"-g", "0.456"}))
+	require.Equal(t, "0.456", f.Lookup("g").Value.String())
+	require.Error(t, f.Parse([]string{"--gas", "kek"}))
+}