massive refactoring against unit test lib

testing/assert/errorsubject.go

@@ -0,0 +1,41 @@
+package assert
+
+func Error(value error) *ErrorSubject {
+	return &ErrorSubject{value: value}
+}
+
+type ErrorSubject struct {
+	Subject
+	value error
+}
+
+func (subject *ErrorSubject) Named(name string) *ErrorSubject {
+	subject.Subject.Named(name)
+	return subject
+}
+
+func (subject *ErrorSubject) Fail(verb string, other error) {
+	subject.FailWithMessage("Not true that " + subject.DisplayString() + " " + verb + " <" + other.Error() + ">.")
+}
+
+func (subject *ErrorSubject) DisplayString() string {
+	return subject.Subject.DisplayString(subject.value.Error())
+}
+
+func (subject *ErrorSubject) Equals(expectation error) {
+	if subject.value != expectation {
+		subject.Fail("is equal to", expectation)
+	}
+}
+
+func (subject *ErrorSubject) IsNil() {
+	if subject.value != nil {
+		subject.FailWithMessage("Not true that " + subject.DisplayString() + " is nil.")
+	}
+}
+
+func (subject *ErrorSubject) IsNotNil() {
+	if subject.value == nil {
+		subject.FailWithMessage("Not true that the error is not nil.")
+	}
+}