cmd/test: --explain now turns on verbose output

Rather than requiring both `--explain` and `--verbose`/`-v` a user
just needs to pass in `--explain` and verbose output will be enabled.

Fixes: #2069
Signed-off-by: Patrick East <east.patrick@gmail.com>

util/enumflag.go

@@ -41,6 +41,11 @@ func (f *EnumFlag) String() string {
 	return f.vs[f.i]
 }
 
+// IsSet will return true if the EnumFlag has been set.
+func (f *EnumFlag) IsSet() bool {
+	return f.i != -1
+}
+
 // Set sets the enum value. If s is not a valid enum value, an error is
 // returned.
 func (f *EnumFlag) Set(s string) error {

util/enumflag_test.go

@@ -17,6 +17,10 @@ func TestEnumFlag(t *testing.T) {
 		t.Fatalf("Expected default value to be foo but got: %v", flag.String())
 	}
 
+	if flag.IsSet() {
+		t.Fatalf("Expected IsSet() to be false")
+	}
+
 	if err := flag.Set("bar"); err != nil {
 		t.Fatalf("Unexpected error on set: %v", err)
 	}
@@ -25,6 +29,10 @@ func TestEnumFlag(t *testing.T) {
 		t.Fatalf("Expected value to be bar but got: %v", flag.String())
 	}
 
+	if !flag.IsSet() {
+		t.Fatalf("Expected IsSet() to be true")
+	}
+
 	if !strings.Contains(flag.Type(), "foo,bar,baz") {
 		t.Fatalf("Expected flag type to contain foo,bar,baz but got: %v", flag.Type())
 	}