tests(commands/option) test the OptionValue methods

TODO add tests for remaning, untested methods.

option_test.go

+package commands
+
+import "testing"
+
+func TestOptionValueExtractBoolNotFound(t *testing.T) {
+	t.Log("ensure that no error is returned when value is not found")
+	optval := &OptionValue{found: false}
+	_, _, err := optval.Bool()
+	if err != nil {
+		t.Fatal("Found was false. Err should have been nil")
+	}
+
+	t.Log("ensure that no error is returned when value is not found (even if value exists)")
+	optval = &OptionValue{value: "wrong type: a string", found: false}
+	_, _, err = optval.Bool()
+	if err != nil {
+		t.Fatal("Found was false. Err should have been nil")
+	}
+}
+
+func TestOptionValueExtractWrongType(t *testing.T) {
+
+	t.Log("ensure that error is returned when value if of wrong type")
+
+	optval := &OptionValue{value: "wrong type: a string", found: true}
+	_, _, err := optval.Bool()
+	if err == nil {
+		t.Fatal("No error returned. Failure.")
+	}
+
+	optval = &OptionValue{value: "wrong type: a string", found: true}
+	_, _, err = optval.Int()
+	if err == nil {
+		t.Fatal("No error returned. Failure.")
+	}
+}