add test

.gitignore

@@ -2,3 +2,4 @@ zig-cache
 zig-out
 *.elf
 *.dol
+!testdata/*.elf

build.zig

@@ -23,4 +23,16 @@ pub fn build(b: *std.Build) void {
 
     const run_step = b.step("run", "Run the app");
     run_step.dependOn(&run_cmd.step);
+
+    // Testing
+    const elf_unit_tests = b.addTest(.{
+        .root_source_file = b.path("src/elf.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const run_elf_unit_tests = b.addRunArtifact(elf_unit_tests);
+
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_elf_unit_tests.step);
 }

src/elf.zig

@@ -255,3 +255,22 @@ fn checkELFHeader(header: ELFHeader) !void {
         return ELFError.NoEntrypoint;
     }
 }
+
+test "readELF: parses known .elf" {
+    const input = try std.fs.cwd().openFile("testdata/example.elf", .{});
+    defer input.close();
+
+    const map = try readELF(input);
+    try std.testing.expectEqual(0x80003100, map.entryPoint);
+    try std.testing.expectEqual(1, map.textCount);
+    try std.testing.expectEqual(1, map.dataCount);
+    try std.testing.expectEqual(0x80003100, map.text[0].address);
+    try std.testing.expectEqual(0x2DD0, map.text[0].size);
+    try std.testing.expectEqual(0x3100, map.text[0].offset);
+    try std.testing.expectEqual(0x80005ed0, map.data[0].address);
+    try std.testing.expectEqual(0xD0, map.data[0].size);
+    try std.testing.expectEqual(0x5ed0, map.data[0].offset);
+    try std.testing.expectEqual(true, map.hasBSS);
+    try std.testing.expectEqual(0x80005fa0, map.bssAddress);
+    try std.testing.expectEqual(0x160, map.bssSize);
+}