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<!DOCTYPE html>
<html>
<head>
<title>EditContext: The TextFormat property</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
test(function() {
const textFormat = new TextFormat();
assert_equals(textFormat.rangeStart, 0);
assert_equals(textFormat.rangeEnd, 0);
assert_equals(textFormat.underlineStyle, "none");
assert_equals(textFormat.underlineThickness, "none");
}, 'Test default values of TextFormat attributes');
test(function(){
const validUnderlineStyles = ["none", "solid", "dotted", "dashed", "wavy"];
const validUnderlineThicknesses = ["none", "thin", "thick"];
// Invalid value should throw type error.
assert_throws_js(TypeError, function() {
const textFormat = new TextFormat({underlineStyle: "Solid"});
}, 'TextFormat must throw a TypeError when underlineStyle is set to an invalid value');
assert_throws_js(TypeError, function() {
const textFormat = new TextFormat({underlineThickness: "Thick"});
}, 'TextFormat must throw a TypeError when underlineThickness is set to an invalid value');
// Verify valid values.
for (const style of validUnderlineStyles) {
const textFormat = new TextFormat({underlineStyle: style});
assert_equals(textFormat.underlineStyle, style, `underlineStyle should accept "${style}"`);
assert_equals(textFormat.underlineThickness, "none", 'default value of underlineThickness should be "none"');
}
for (const thickness of validUnderlineThicknesses) {
const textFormat = new TextFormat({underlineThickness: thickness});
assert_equals(textFormat.underlineStyle, "none", 'default value of underlineStyle should be "none"');
assert_equals(textFormat.underlineThickness, thickness, `underlineThickness should accept "${thickness}"`);
}
}, 'Test valid values of TextFormat underlineStyle and underlineThickness');
</script>
</body>
</html>
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