Use GoConvey for HTTP error type tests

errors_test.go

@@ -4,31 +4,49 @@ package fargo
 
 import (
 	"errors"
+	"strconv"
 	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
 )
 
 func TestHTTPResponseStatusCode(t *testing.T) {
-	tests := []struct {
-		input   error
-		present bool
-		code    int
-	}{
-		{nil, false, 0},
-		{errors.New("other"), false, 0},
-		{&unsuccessfulHTTPResponse{404, "missing"}, true, 404},
-	}
-	for _, test := range tests {
-		code, present := HTTPResponseStatusCode(test.input)
-		if present {
-			if !test.present {
-				t.Errorf("input %v: want absent, got code %d", test.input, code)
-				continue
-			}
-			if code != test.code {
-				t.Errorf("input %v: want %d, got %d", test.input, test.code, code)
-			}
-		} else if test.present {
-			t.Errorf("input %v: want code %d, got absent", test.input, test.code)
+	Convey("An nil error should have no HTTP status code", t, func() {
+		_, present := HTTPResponseStatusCode(nil)
+		So(present, ShouldBeFalse)
+	})
+	Convey("A foreign error should have no detectable HTTP status code", t, func() {
+		_, present := HTTPResponseStatusCode(errors.New("other"))
+		So(present, ShouldBeFalse)
+	})
+	Convey("A fargo error generated from a response from Eureka", t, func() {
+		verify := func(err *unsuccessfulHTTPResponse) {
+			Convey("should have the given HTTP status code", func() {
+				code, present := HTTPResponseStatusCode(err)
+				So(present, ShouldBeTrue)
+				So(code, ShouldEqual, err.statusCode)
+				Convey("should produce a message", func() {
+					msg := err.Error()
+					if len(err.messagePrefix) == 0 {
+						Convey("that lacks a prefx", func() {
+							So(msg, ShouldNotStartWith, ",")
+						})
+					} else {
+						Convey("that starts with the given prefix", func() {
+							So(msg, ShouldStartWith, err.messagePrefix)
+						})
+					}
+					Convey("that contains the status code in decimal notation", func() {
+						So(msg, ShouldContainSubstring, strconv.Itoa(err.statusCode))
+					})
+				})
+			})
 		}
-	}
+		Convey("with a message prefix", func() {
+			verify(&unsuccessfulHTTPResponse{500, "operation failed"})
+		})
+		Convey("without a message prefix", func() {
+			verify(&unsuccessfulHTTPResponse{statusCode: 500})
+		})
+	})
 }