cuoolcumber

Cargo.lock

@@ -416,6 +416,7 @@ version = "0.1.0"
 dependencies = [
  "cucumber",
  "futures",
+ "rand",
  "tokio",
 ]
 
@@ -561,6 +562,17 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "gherkin"
 version = "0.14.0"
@@ -949,6 +961,12 @@ dependencies = [
  "plotters-backend",
 ]
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.76"
@@ -967,6 +985,36 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "rayon"
 version = "1.8.0"
@@ -1027,6 +1075,10 @@ name = "revsqrt"
 version = "0.1.0"
 dependencies = [
  "criterion",
+ "cucumber",
+ "futures",
+ "rand",
+ "tokio",
 ]
 
 [[package]]
@@ -1347,6 +1399,12 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.89"

members/cucumber-demo/Cargo.toml

@@ -9,6 +9,7 @@ edition = "2021"
 futures = "0.3.30"
 cucumber = "0.20.2"
 tokio = { version = "1.10", features = ["macros", "rt-multi-thread", "time"] }
+rand = "0.8.5"
 
 [[test]]
 name = "example" # this should be the same as the filename of your test target

members/revsqrt/Cargo.toml

@@ -5,6 +5,10 @@ edition = "2021"
 
 [dev-dependencies]
 criterion = "0.5.1"
+futures = "0.3.30"
+cucumber = "0.20.2"
+tokio = { version = "1.10", features = ["macros", "rt-multi-thread", "time"] }
+rand = "0.8.5"
 
 [[bench]]
 name = "rsqrt-bench"
@@ -17,3 +21,7 @@ path = "src/lib.rs"
 [[bin]]
 name = "revsqrt"
 path = "src/main.rs"
+
+[[test]]
+name = "revsqrt"
+harness = false  # allows Cucumber to print output instead of libtest

members/revsqrt/tests/features/book/revsqrt.feature

@@ -0,0 +1,6 @@
+Feature: inverted square root feature
+
+  Scenario: If we calculate the inverted square root of a number using fast inverted square root, it's about the same as if we calculate it normally
+    Given a number
+    When We calculate the the inverted square root of a number using fast inverted square root
+    Then The result is about the same as if we calculate it normally

members/revsqrt/tests/revsqrt.rs

@@ -0,0 +1,36 @@
+use revsqrt::*;
+
+use cucumber::{given, then, when, World};
+use rand;
+
+#[derive(Debug, Default, World)]
+pub struct NumWorld {
+    number: f32,
+    result: f32,
+}
+
+// is n about the same as m?
+fn about_same(n: f32, m: f32) -> bool {
+    (n - m)*1000f32 < 1f32
+}
+
+// Steps are defined with `given`, `when` and `then` attributes.
+#[given(regex = r"^a number$")]
+async fn hungry_cat(world: &mut NumWorld) {
+    world.number = rand::random();
+}
+
+#[when("We calculate the the inverted square root of a number using fast inverted square root")]
+async fn calc_fast_inv_sqrt(world: &mut NumWorld) {
+    world.result = revsqrt::fast_inverse_sqrt(world.number);
+}
+
+#[then("The result is about the same as if we calculate it normally")]
+async fn comp_result_with_normal(world: &mut NumWorld) {
+    assert!(about_same(world.number, world.result));
+}
+
+#[tokio::main]
+async fn main() {
+    futures::executor::block_on(NumWorld::run("tests/features/book/revsqrt.feature"));
+}