refactor: vertex_index_common: elide tests alloc. w/ Itertools::cartesian_product

Cargo.lock

@@ -4384,6 +4384,7 @@ dependencies = [
  "env_logger",
  "futures-lite",
  "image",
+ "itertools",
  "js-sys",
  "libtest-mimic",
  "log",

Cargo.toml

@@ -91,6 +91,7 @@ getrandom = "0.2"
 glam = "0.27"
 heck = "0.5.0"
 image = { version = "0.24", default-features = false, features = ["png"] }
+itertools = { version = "0.10.5" }
 ktx2 = "0.3"
 libc = "0.2"
 # libloading 0.8 switches from `winapi` to `windows-sys`; permit either

tests/Cargo.toml

@@ -27,6 +27,7 @@ bytemuck.workspace = true
 cfg-if.workspace = true
 ctor.workspace = true
 futures-lite.workspace = true
+itertools.workspace = true
 libtest-mimic.workspace = true
 log.workspace = true
 parking_lot.workspace = true

tests/tests/vertex_indices/mod.rs

@@ -5,6 +5,7 @@
 
 use std::{num::NonZeroU64, ops::Range};
 
+use itertools::Itertools;
 use strum::IntoEnumIterator;
 use wgpu::util::{BufferInitDescriptor, DeviceExt, RenderEncoder};
 
@@ -337,30 +338,23 @@ async fn vertex_index_common(ctx: TestingContext) {
         )
         .create_view(&wgpu::TextureViewDescriptor::default());
 
-    let mut tests = Vec::with_capacity(
-        TestCase::iter().count()
-            * IdSource::iter().count()
-            * DrawCallKind::iter().count()
-            * EncoderKind::iter().count()
-            * [false, true].iter().count(),
-    );
-    for case in TestCase::iter() {
-        for id_source in IdSource::iter() {
-            for draw_call_kind in DrawCallKind::iter() {
-                for encoder_kind in EncoderKind::iter() {
-                    for vertex_pulling_transform in [false, true] {
-                        tests.push(Test {
-                            case,
-                            id_source,
-                            draw_call_kind,
-                            encoder_kind,
-                            vertex_pulling_transform,
-                        })
-                    }
+    let tests = TestCase::iter()
+        .cartesian_product(IdSource::iter())
+        .cartesian_product(DrawCallKind::iter())
+        .cartesian_product(EncoderKind::iter())
+        .cartesian_product([false, true])
+        .map(
+            |((((case, id_source), draw_call_kind), encoder_kind), vertex_pulling_transform)| {
+                Test {
+                    case,
+                    id_source,
+                    draw_call_kind,
+                    encoder_kind,
+                    vertex_pulling_transform,
                 }
-            }
-        }
-    }
+            },
+        )
+        .collect::<Vec<_>>();
 
     let features = ctx.adapter.features();