Unit tests (#10)

Add a couple unit tests for core functionality
markphelps · Dec 10, 2018 · f71faa1 · f71faa1
1 parent e0a8e47
commit f71faa1
Show file tree

Hide file tree

Showing 2 changed files with 286 additions and 0 deletions.
diff --git a/int_test.go b/int_test.go
@@ -0,0 +1,143 @@
+package optional
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestInt_Get_Present(t *testing.T) {
+	o := NewInt(42)
+
+	v, err := o.Get()
+	assert.True(t, o.Present())
+	assert.NoError(t, err)
+	assert.Equal(t, 42, v)
+}
+
+func TestInt_Get_NotPresent(t *testing.T) {
+	o := Int{}
+	var zero int
+
+	v, err := o.Get()
+	assert.False(t, o.Present())
+	assert.Error(t, err)
+	assert.Equal(t, zero, v)
+}
+
+func TestInt_OrElse_Present(t *testing.T) {
+	o := NewInt(42)
+
+	v := o.OrElse(99)
+	assert.True(t, o.Present())
+	assert.Equal(t, 42, v)
+}
+
+func TestInt_OrElse_NotPresent(t *testing.T) {
+	o := Int{}
+
+	v := o.OrElse(99)
+	assert.False(t, o.Present())
+	assert.Equal(t, 99, v)
+}
+
+func TestInt_If_Present(t *testing.T) {
+	o := NewInt(42)
+
+	canary := false
+	o.If(func(v int) {
+		canary = true
+	})
+	assert.True(t, o.Present())
+	assert.True(t, canary)
+}
+
+func TestInt_If_NotPresent(t *testing.T) {
+	o := Int{}
+
+	canary := false
+	o.If(func(v int) {
+		canary = true
+	})
+	assert.False(t, o.Present())
+	assert.False(t, canary)
+}
+
+func TestInt_MarshalJSON(t *testing.T) {
+	type fields struct {
+		WithValue     Int
+		WithZeroValue Int
+		WithNoValue   Int
+		Unused        Int
+	}
+
+	var instance = fields{
+		WithValue:     NewInt(42),
+		WithZeroValue: NewInt(0),
+		WithNoValue:   Int{},
+	}
+
+	out, err := json.Marshal(instance)
+	assert.NoError(t, err)
+	assert.Equal(t, `{"WithValue":42,"WithZeroValue":0,"WithNoValue":null,"Unused":null}`, string(out))
+}
+
+func TestInt_UnmarshalJSON(t *testing.T) {
+	type fields struct {
+		WithValue     Int
+		WithZeroValue Int
+		WithNoValue   Int
+		Unused        Int
+	}
+
+	var jsonString = `{"WithValue":42,"WithZeroValue":0,"WithNoValue":null}`
+	instance := fields{}
+
+	err := json.Unmarshal([]byte(jsonString), &instance)
+	assert.NoError(t, err)
+
+	assert.True(t, instance.WithZeroValue.Present())
+	assert.Equal(t, 42, *instance.WithValue.value)
+
+	assert.True(t, instance.WithZeroValue.Present())
+	assert.Equal(t, 0, *instance.WithZeroValue.value)
+
+	assert.False(t, instance.WithNoValue.Present())
+	assert.Nil(t, instance.WithNoValue.value)
+
+	assert.False(t, instance.Unused.Present())
+	assert.Nil(t, instance.Unused.value)
+}
+
+func TestInt_UnmarshalJSON_Overwritten(t *testing.T) {
+	type fields struct {
+		WithValue     Int
+		WithZeroValue Int
+		WithNoValue   Int
+		Unused        Int
+	}
+
+	var jsonString = `{"WithValue":42,"WithZeroValue":0,"WithNoValue":null}`
+	instance := fields{
+		WithValue:     NewInt(1),
+		WithZeroValue: NewInt(2),
+		WithNoValue:   NewInt(3),
+		Unused:        NewInt(4),
+	}
+
+	err := json.Unmarshal([]byte(jsonString), &instance)
+	assert.NoError(t, err)
+
+	assert.True(t, instance.WithValue.Present())
+	assert.Equal(t, 42, *instance.WithValue.value)
+
+	assert.True(t, instance.WithZeroValue.Present())
+	assert.Equal(t, 0, *instance.WithZeroValue.value)
+
+	assert.False(t, instance.WithNoValue.Present())
+	assert.Nil(t, instance.WithNoValue.value)
+
+	assert.True(t, instance.Unused.Present())
+	assert.Equal(t, 4, *instance.Unused.value)
+}
diff --git a/string_test.go b/string_test.go
@@ -0,0 +1,143 @@
+package optional
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestString_Get_Present(t *testing.T) {
+	o := NewString("foo")
+
+	v, err := o.Get()
+	assert.True(t, o.Present())
+	assert.NoError(t, err)
+	assert.Equal(t, "foo", v)
+}
+
+func TestString_Get_NotPresent(t *testing.T) {
+	o := String{}
+	var zero string
+
+	v, err := o.Get()
+	assert.False(t, o.Present())
+	assert.Error(t, err)
+	assert.Equal(t, zero, v)
+}
+
+func TestString_OrElse_Present(t *testing.T) {
+	o := NewString("foo")
+
+	v := o.OrElse("bar")
+	assert.True(t, o.Present())
+	assert.Equal(t, "foo", v)
+}
+
+func TestString_OrElse_NotPresent(t *testing.T) {
+	o := String{}
+
+	v := o.OrElse("bar")
+	assert.False(t, o.Present())
+	assert.Equal(t, "bar", v)
+}
+
+func TestString_If_Present(t *testing.T) {
+	o := NewString("foo")
+
+	canary := false
+	o.If(func(v string) {
+		canary = true
+	})
+	assert.True(t, o.Present())
+	assert.True(t, canary)
+}
+
+func TestString_If_NotPresent(t *testing.T) {
+	o := String{}
+
+	canary := false
+	o.If(func(v string) {
+		canary = true
+	})
+	assert.False(t, o.Present())
+	assert.False(t, canary)
+}
+
+func TestString_MarshalJSON(t *testing.T) {
+	type fields struct {
+		WithValue     String
+		WithZeroValue String
+		WithNoValue   String
+		Unused        String
+	}
+
+	var instance = fields{
+		WithValue:     NewString("foo"),
+		WithZeroValue: NewString(""),
+		WithNoValue:   String{},
+	}
+
+	out, err := json.Marshal(instance)
+	assert.NoError(t, err)
+	assert.Equal(t, `{"WithValue":"foo","WithZeroValue":"","WithNoValue":null,"Unused":null}`, string(out))
+}
+
+func TestString_UnmarshalJSON(t *testing.T) {
+	type fields struct {
+		WithValue     String
+		WithZeroValue String
+		WithNoValue   String
+		Unused        String
+	}
+
+	var jsonString = `{"WithValue":"foo","WithZeroValue":"","WithNoValue":null}`
+	instance := fields{}
+
+	err := json.Unmarshal([]byte(jsonString), &instance)
+	assert.NoError(t, err)
+
+	assert.True(t, instance.WithZeroValue.Present())
+	assert.Equal(t, "foo", *instance.WithValue.value)
+
+	assert.True(t, instance.WithZeroValue.Present())
+	assert.Equal(t, "", *instance.WithZeroValue.value)
+
+	assert.False(t, instance.WithNoValue.Present())
+	assert.Nil(t, instance.WithNoValue.value)
+
+	assert.False(t, instance.Unused.Present())
+	assert.Nil(t, instance.Unused.value)
+}
+
+func TestString_UnmarshalJSON_Overwritten(t *testing.T) {
+	type fields struct {
+		WithValue     String
+		WithZeroValue String
+		WithNoValue   String
+		Unused        String
+	}
+
+	var jsonString = `{"WithValue":"foo","WithZeroValue":"","WithNoValue":null}`
+	instance := fields{
+		WithValue:     NewString("seed_a"),
+		WithZeroValue: NewString("seed_b"),
+		WithNoValue:   NewString("seed_c"),
+		Unused:        NewString("seed_d"),
+	}
+
+	err := json.Unmarshal([]byte(jsonString), &instance)
+	assert.NoError(t, err)
+
+	assert.True(t, instance.WithValue.Present())
+	assert.Equal(t, "foo", *instance.WithValue.value)
+
+	assert.True(t, instance.WithZeroValue.Present())
+	assert.Equal(t, "", *instance.WithZeroValue.value)
+
+	assert.False(t, instance.WithNoValue.Present())
+	assert.Nil(t, instance.WithNoValue.value)
+
+	assert.True(t, instance.Unused.Present())
+	assert.Equal(t, "seed_d", *instance.Unused.value)
+}