Fix running tests for zig master (0.15.0)

Author: insolor

build.zig

@@ -4,22 +4,24 @@ pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
-    const itertools = b.addModule("itertools", .{
-        .root_source_file = b.path("src/itertools.zig"),
+    const zig_itertools = b.addModule("zig_itertools", .{
+        .root_source_file = b.path("src/zig_itertools.zig"),
         .target = target,
         .optimize = optimize,
     });
 
-    const lib_tests = b.addTest(.{
-        .root_source_file = b.path("src/itertools.zig"),
+    const test_module = b.addModule("zig_itertools_test", .{
+        .root_source_file = b.path("tests/tests.zig"),
         .target = target,
         .optimize = optimize,
     });
 
-    lib_tests.root_module.addImport("itertools", itertools);
+    const lib_tests = b.addTest(.{ .root_module = test_module });
+
+    lib_tests.root_module.addImport("zig_itertools", zig_itertools);
 
     const run_unit_tests = b.addRunArtifact(lib_tests);
 
     const test_step = b.step("test", "Run unit tests");
     test_step.dependOn(&run_unit_tests.step);
-}
+}