bar: Add geom_format_to_pixels tests

tests/CMakeLists.txt

@@ -82,6 +82,7 @@ unit_test(components/command_line unit_tests
   SOURCES
   components/command_line.cpp
   utils/string.cpp)
+unit_test(components/bar unit_tests)
 
 # Compile all unit tests with 'make all_unit_tests'
 add_custom_target("all_unit_tests" DEPENDS ${unit_tests})

tests/unit_tests/components/bar.cpp

@@ -0,0 +1,47 @@
+#include "common/test.hpp"
+#include "components/bar.hpp"
+
+using namespace polybar;
+
+
+
+/**
+ * \brief Class for parameterized tests on geom_format_to_pixels
+ *
+ * The first element in the tuple is the expected return value, the second
+ * value is the format string. The max value is always 1000
+ */
+class GeomFormatToPixelsTest :
+  public ::testing::Test,
+  public ::testing::WithParamInterface<pair<double, string>> {};
+
+vector<pair<double, string>> to_pixels_no_offset_list = {
+  {1000, "100%"},
+  {0, "0%"},
+  {1000, "150%"},
+  {100, "10%"},
+  {0, "0"},
+  {1234, "1234"},
+  {1.234, "1.234"},
+};
+
+vector<pair<double, string>> to_pixels_with_offset_list = {
+  {1000, "100%:-0"},
+  {1000, "100%:+0"},
+  {1010, "100%:+10"},
+  {990, "100%:-10"},
+  {10, "0%:+10"},
+  {1000, "99%:+10"},
+};
+
+INSTANTIATE_TEST_CASE_P(NoOffset, GeomFormatToPixelsTest,
+    ::testing::ValuesIn(to_pixels_no_offset_list),);
+
+INSTANTIATE_TEST_CASE_P(WithOffset, GeomFormatToPixelsTest,
+    ::testing::ValuesIn(to_pixels_with_offset_list),);
+
+TEST_P(GeomFormatToPixelsTest, correctness) {
+  double exp = GetParam().first;
+  std::string str = GetParam().second;
+  EXPECT_DOUBLE_EQ(exp, geom_format_to_pixels(str, 1000));
+}