Add missing widget tests

ui/widget/button_test.go

@@ -0,0 +1,26 @@
+package widget
+
+import "testing"
+
+import "github.com/stretchr/testify/assert"
+
+import _ "github.com/fyne-io/fyne/test"
+import "github.com/fyne-io/fyne/ui/theme"
+
+func TestButtonTestSize(t *testing.T) {
+	button := NewButton("Hi", nil)
+	min := button.MinSize()
+
+	assert.True(t, min.Width >= theme.Padding()*2)
+	assert.True(t, min.Height >= theme.Padding()*2)
+}
+
+func TestButtonTestNotify(t *testing.T) {
+	tapped := false
+	button := NewButton("Hi", func() {
+		tapped = true
+	})
+	button.OnMouseDown(nil)
+
+	assert.True(t, tapped)
+}

ui/widget/entry_test.go

@@ -6,8 +6,18 @@ import "github.com/stretchr/testify/assert"
 
 import _ "github.com/fyne-io/fyne/test"
 import "github.com/fyne-io/fyne/ui"
+import "github.com/fyne-io/fyne/ui/canvas"
+import "github.com/fyne-io/fyne/ui/theme"
 
-func TestAppend(t *testing.T) {
+func TestEntryTestSize(t *testing.T) {
+	entry := NewEntry()
+	min := entry.MinSize()
+
+	assert.True(t, min.Width >= theme.Padding()*2)
+	assert.True(t, min.Height >= theme.Padding()*2)
+}
+
+func TestEntryTestAppend(t *testing.T) {
 	entry := NewEntry()
 
 	key := new(ui.KeyEvent)
@@ -19,7 +29,7 @@ func TestAppend(t *testing.T) {
 	assert.Equal(t, entry.Text(), "Hi")
 }
 
-func TestBackspace(t *testing.T) {
+func TestEntryTestBackspace(t *testing.T) {
 	entry := NewEntry()
 	entry.SetText("Hi")
 
@@ -29,3 +39,27 @@ func TestBackspace(t *testing.T) {
 
 	assert.Equal(t, entry.Text(), "H")
 }
+
+func TestEntryTestNotify(t *testing.T) {
+	entry := NewEntry()
+	changed := false
+
+	entry.OnChanged = func(string) {
+		changed = true
+	}
+	entry.SetText("Test")
+
+	assert.True(t, changed)
+}
+
+func TestEntryTestFocusHighlight(t *testing.T) {
+	entry := NewEntry()
+	bg := entry.Layout(entry.MinSize())[0].(*canvas.Rectangle)
+	color := bg.FillColor
+
+	entry.OnFocusGained()
+	assert.NotEqual(t, bg.FillColor, color)
+
+	entry.OnFocusLost()
+	assert.Equal(t, bg.FillColor, color)
+}