glfw: fix and test VideoMode getters

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

glfw/src/VideoMode.zig

@@ -5,6 +5,8 @@
 const std = @import("std");
 const c = @import("c.zig").c;
 
+const VideoMode = @This();
+
 handle: c.GLFWvidmode,
 
 /// Returns the width of the video mode, in screen coordinates.
@@ -36,3 +38,13 @@ pub inline fn getBlueBits(self: VideoMode) usize {
 pub inline fn getRefreshRate(self: VideoMode) usize {
     return @intCast(usize, self.handle.refreshRate);
 }
+
+test "getters" {
+    const x = std.mem.zeroes(VideoMode);
+    _ = x.getWidth();
+    _ = x.getHeight();
+    _ = x.getRedBits();
+    _ = x.getGreenBits();
+    _ = x.getBlueBits();
+    _ = x.getRefreshRate();
+}

glfw/src/main.zig

@@ -17,6 +17,7 @@ pub const mod = @import("mod.zig");
 pub const Monitor = @import("Monitor.zig");
 pub const mouse_button = @import("mouse_button.zig");
 pub const version = @import("version.zig");
+pub const VideoMode = @import("VideoMode.zig");
 
 /// Initializes the GLFW library.
 ///
@@ -142,5 +143,6 @@ test "version" {
 
 test "basic" {
     _ = Monitor;
+    _ = VideoMode;
     basicTest() catch unreachable;
 }