person.go: 100% test coverage

internal/test/fake_source.go

@@ -0,0 +1,26 @@
+package test
+
+// FakeSource implements the rand.Source interface. This is useful for when we
+// want to supply dummy/predictable values to test specific scenarios that depend
+// on rand.Rand.
+type FakeSource struct {
+	seed int64
+}
+
+// NewFakeSource returns a new instance of FakeSource. FakeSource does not
+// generates random numbers, so the passed in seed number is the returned "random"
+// number.
+func NewFakeSource(seed int64) *FakeSource {
+	return &FakeSource{seed: seed}
+}
+
+// Seed sets the internal int to the passed in seed value. This will be the returned
+// value when using FakeSource.Int63().
+func (s *FakeSource) Seed(seed int64) {
+	s.seed = seed
+}
+
+// Int63 returns the dummy seed value.
+func (s *FakeSource) Int63() int64 {
+	return s.seed
+}

internal/test/fake_source_test.go

@@ -0,0 +1,17 @@
+package test
+
+import "testing"
+
+func TestFakeGenerator(t *testing.T) {
+	s := NewFakeSource(100)
+
+	if n := s.Int63(); n != 100 {
+		t.Errorf("expected 100 but got %d", n)
+	}
+
+	s.Seed(200)
+
+	if n := s.Int63(); n != 200 {
+		t.Errorf("expected 200 but got %d", n)
+	}
+}

person.go

@@ -134,7 +134,7 @@ func (p Person) GenderFemale() string {
 
 // Title returns a fake title for Person
 func (p Person) Title() string {
-	if p.Faker.IntBetween(0, 1) == 0 {
+	if p.Faker.IntBetween(0, 2) == 0 {
 		return p.TitleMale()
 	}
 
@@ -168,7 +168,7 @@ func (p Person) LastName() string {
 // Name returns a fake name for Person
 func (p Person) Name() string {
 	formats := append(maleNameFormats, femaleNameFormats...)
-	name := formats[p.Faker.IntBetween(0, len(formats)-1)]
+	name := formats[p.Faker.IntBetween(0, len(formats))]
 
 	// {{titleMale}}
 	if strings.Contains(name, "{{titleMale}}") {

person_test.go

@@ -3,6 +3,8 @@ package faker
 import (
 	"strings"
 	"testing"
+
+	"github.com/jaswdr/faker/internal/test"
 )
 
 func TestTitleMale(t *testing.T) {
@@ -16,8 +18,22 @@ func TestTitleFemale(t *testing.T) {
 }
 
 func TestTitle(t *testing.T) {
-	p := New().Person()
-	Expect(t, 3, len(p.Title()))
+	// Test Title Male
+	s := test.NewFakeSource(0)
+	f := NewWithSeed(s)
+	maleTitle := f.Person().Title()
+
+	Expect(t, 3, len(maleTitle))
+
+	// Test Title Female
+	s.Seed(1)
+	femaleTitle := f.Person().Title()
+
+	Expect(t, 3, len(femaleTitle))
+
+	if maleTitle == femaleTitle {
+		t.Errorf("expected male title '%s' to be different from female title '%s'", maleTitle, femaleTitle)
+	}
 }
 
 func TestSuffix(t *testing.T) {
@@ -51,8 +67,25 @@ func TestLastName(t *testing.T) {
 }
 
 func TestName(t *testing.T) {
-	p := New().Person()
-	name := p.Name()
+	// Set fake generator int to 6 to grab this maleNameFormat:
+	// "{{titleMale}} {{firstNameMale}} {{lastName}} {{suffix}}"
+	s := test.NewFakeSource(6)
+	f := NewWithSeed(s)
+	name := f.Person().Name()
+
+	Expect(t, true, len(name) > 0)
+	Expect(t, false, strings.Contains(name, "{{titleMale}}"))
+	Expect(t, false, strings.Contains(name, "{{firstNameMale}}"))
+	Expect(t, false, strings.Contains(name, "{{titleFemale}}"))
+	Expect(t, false, strings.Contains(name, "{{firstNameFemale}}"))
+	Expect(t, false, strings.Contains(name, "{{lastName}}"))
+	Expect(t, false, strings.Contains(name, "{{suffix}}"))
+
+	// Set int to 13 to grab this femaleNameFormat:
+	// "{{titleFemale}} {{firstNameFemale}} {{lastName}} {{suffix}}"
+	s.Seed(13)
+	name = f.Person().Name()
+
 	Expect(t, true, len(name) > 0)
 	Expect(t, false, strings.Contains(name, "{{titleMale}}"))
 	Expect(t, false, strings.Contains(name, "{{firstNameMale}}"))
@@ -79,8 +112,17 @@ func TestGenderFemale(t *testing.T) {
 }
 
 func TestNameAndGender(t *testing.T) {
-	p := New().Person()
-	name, gender := p.NameAndGender()
+	// Test Name and Gender Female.
+	s := test.NewFakeSource(0)
+	f := NewWithSeed(s)
+	name, gender := f.Person().NameAndGender()
+
 	Expect(t, true, name != "")
-	Expect(t, true, gender == "Male" || gender == "Female")
+	Expect(t, true, gender == "Female")
+
+	// Test Name and Gender Male.
+	s.Seed(51)
+	name, gender = f.Person().NameAndGender()
+	Expect(t, true, name != "")
+	Expect(t, true, gender == "Male")
 }