Start UI core layout value tests

tests/ui_core/layout_value_tests.cpp

@@ -0,0 +1,58 @@
+#include "ui_core/layout_value.h"
+#include "test_harness.h"
+
+#include <string_view>
+
+using pp::foundation::StatusCode;
+using pp::ui::LayoutLengthKind;
+using pp::ui::layout_length_kind_name;
+using pp::ui::parse_layout_length;
+
+namespace {
+
+void parses_auto_pixels_and_percent(pp::tests::Harness& h)
+{
+    const auto auto_value = parse_layout_length("auto");
+    const auto pixels = parse_layout_length("28");
+    const auto percent = parse_layout_length("100%");
+
+    PP_EXPECT(h, auto_value.ok());
+    PP_EXPECT(h, auto_value.value().kind == LayoutLengthKind::auto_value);
+    PP_EXPECT(h, pixels.ok());
+    PP_EXPECT(h, pixels.value().kind == LayoutLengthKind::pixels);
+    PP_EXPECT(h, pixels.value().value == 28U);
+    PP_EXPECT(h, percent.ok());
+    PP_EXPECT(h, percent.value().kind == LayoutLengthKind::percent);
+    PP_EXPECT(h, percent.value().value == 100U);
+    PP_EXPECT(h, layout_length_kind_name(LayoutLengthKind::percent) == std::string_view("percent"));
+}
+
+void rejects_invalid_layout_lengths(pp::tests::Harness& h)
+{
+    const auto empty = parse_layout_length("");
+    const auto negative = parse_layout_length("-1");
+    const auto trailing = parse_layout_length("28px");
+    const auto too_large_percent = parse_layout_length("101%");
+    const auto bare_percent = parse_layout_length("%");
+
+    PP_EXPECT(h, !empty.ok());
+    PP_EXPECT(h, empty.status().code == StatusCode::invalid_argument);
+    PP_EXPECT(h, !negative.ok());
+    PP_EXPECT(h, negative.status().code == StatusCode::invalid_argument);
+    PP_EXPECT(h, !trailing.ok());
+    PP_EXPECT(h, trailing.status().code == StatusCode::invalid_argument);
+    PP_EXPECT(h, !too_large_percent.ok());
+    PP_EXPECT(h, too_large_percent.status().code == StatusCode::out_of_range);
+    PP_EXPECT(h, !bare_percent.ok());
+    PP_EXPECT(h, bare_percent.status().code == StatusCode::invalid_argument);
+}
+
+}
+
+int main()
+{
+    pp::tests::Harness harness;
+    harness.run("parses_auto_pixels_and_percent", parses_auto_pixels_and_percent);
+    harness.run("rejects_invalid_layout_lengths", rejects_invalid_layout_lengths);
+    return harness.finish();
+}