Writing tests for the Forms package

.gitignore

@@ -0,0 +1,2 @@
+**/c.out
+**/c.html

internal/forms/forms.go

@@ -2,7 +2,6 @@ package forms
 
 import (
 	"fmt"
-	"net/http"
 	"net/url"
 	"strings"
 
@@ -25,18 +24,18 @@ func New(data url.Values) *Form {
 
 // Required checks required fields
 func (f *Form) Required(fields ...string) {
-    for _, field := range fields {
-        value := f.Get(field)
-        if strings.TrimSpace(value) == "" {
-            f.Errors.Add(field, "This field cannot be blank")
-        }
-    }
+	for _, field := range fields {
+		value := f.Get(field)
+		if strings.TrimSpace(value) == "" {
+			f.Errors.Add(field, "This field cannot be blank")
+		}
+	}
 }
 
 // Has checks if form field is in post and not emtpy
-func (f *Form) Has(field string, r *http.Request) bool {
-	x := r.Form.Get(field)
-    return x != ""
+func (f *Form) Has(field string) bool {
+	x := f.Get(field)
+	return x != ""
 }
 
 // Valid returns true if there are no errors, otherwise false
@@ -45,19 +44,19 @@ func (f *Form) Valid() bool {
 }
 
 // MinLength checks for string minimum length
-func (f *Form) MinLength(field string, length int, r *http.Request) bool {
-    value := r.Form.Get(field)
-    if len(value) < length {
-        f.Errors.Add(field, fmt.Sprintf("This field must have at least %d letters", length))
-        return false
-    }
-    return true
+func (f *Form) MinLength(field string, length int) bool {
+	value := f.Get(field)
+	if len(value) < length {
+		f.Errors.Add(field, fmt.Sprintf("This field must have at least %d letters", length))
+		return false
+	}
+	return true
 }
 
 // IsEmail checks the email address
-func (f *Form) IsEmail(field string, r *http.Request) {
-    value := r.Form.Get(field)
-    if !govalidator.IsEmail(value) {
-        f.Errors.Add(field, "Invalid email address")
-    }
+func (f *Form) IsEmail(field string) {
+	value := f.Get(field)
+	if !govalidator.IsEmail(value) {
+		f.Errors.Add(field, "Invalid email address")
+	}
 }

internal/forms/forms_test.go

@@ -0,0 +1,131 @@
+package forms
+
+import (
+	"net/http/httptest"
+	"net/url"
+	"testing"
+)
+
+func TestForms_Valid(t *testing.T) {
+	r := httptest.NewRequest("POST", "/test-url", nil)
+	form := New(r.PostForm)
+
+	isValid := form.Valid()
+	if !isValid {
+		t.Error("got invalid when should have been valid")
+	}
+}
+
+func TestForms_Required(t *testing.T) {
+	r := httptest.NewRequest("POST", "/test-url", nil)
+	form := New(r.PostForm)
+
+	form.Required("a", "b", "c")
+	if form.Valid() {
+		t.Error("required fields are not given, should be invalid")
+	}
+
+	postData := url.Values{}
+
+	postData.Add("a", "a")
+	postData.Add("b", "a")
+	postData.Add("c", "a")
+
+	r = httptest.NewRequest("POST", "/test-url", nil)
+	r.PostForm = postData
+
+	form = New(r.PostForm)
+
+	form.Required("a", "b", "c")
+	if !form.Valid() {
+		t.Error("required fields are given, should be valid")
+	}
+}
+
+func TestForms_Has(t *testing.T) {
+	postData := url.Values{}
+	form := New(postData)
+
+	if form.Has("a") {
+		t.Error("the field should not exist")
+	}
+
+	postData = url.Values{}
+	postData.Add("a", "a")
+	form = New(postData)
+
+	if !form.Has("a") {
+		t.Error("the field should exist")
+	}
+}
+
+func TestForms_MinLength(t *testing.T) {
+	postData := url.Values{}
+	form := New(postData)
+
+	if form.MinLength("a", 3) {
+		t.Error("the field should not exist")
+	}
+
+	errMsg := form.Errors.Get("a")
+	if errMsg != "This field must have at least 3 letters" {
+		t.Error("should have an errMsg")
+	}
+
+	if form.Valid() {
+		t.Error("should be invalid")
+	}
+
+	postData = url.Values{}
+	postData.Add("a", "ab")
+	postData.Add("b", "abc")
+	form = New(postData)
+
+	if form.MinLength("a", 3) {
+		t.Error("the field is shorter than 3 chars")
+	}
+
+	if !form.MinLength("b", 3) {
+		t.Error("the field is equal to 3 chars")
+	}
+
+	if form.Valid() {
+		t.Error("should be invalid")
+	}
+}
+
+func TestForms_IsEmail(t *testing.T) {
+	postData := url.Values{}
+	form := New(postData)
+
+	form.IsEmail("a")
+
+	if form.Valid() {
+		t.Error("email should not exit")
+	}
+
+	postData = url.Values{}
+	postData.Add("a", "a@a.com")
+	form = New(postData)
+
+	form.IsEmail("a")
+
+	errMsg := form.Errors.Get("a")
+	if errMsg != "" {
+		t.Error("should not have an errMsg")
+	}
+
+	if !form.Valid() {
+		t.Error("should be a valid email")
+	}
+
+	postData = url.Values{}
+	postData.Add("a", "a@.com")
+	form = New(postData)
+
+	form.IsEmail("a")
+
+	if form.Valid() {
+		t.Error("Should not be a valid email")
+	}
+}

internal/handlers/handlers.go

@@ -100,8 +100,8 @@ func (m *Repository) PostMakeReservation(w http.ResponseWriter, r *http.Request)
 	form := forms.New(r.PostForm)
 
 	form.Required("first_name", "last_name", "email")
-	form.MinLength("first_name", 2, r)
-	form.IsEmail("email", r)
+	form.MinLength("first_name", 2)
+	form.IsEmail("email")
 
 	if !form.Valid() {
 		data := make(map[string]interface{})