test: added simd_alignment_test

Test whether the size of `SimdBlock` agrees with the expected one
for a given target.

Author: V0ldek

.cargo/config.toml

@@ -1,5 +1,5 @@
 [build]
-rustflags = "-C target-feature=+avx2"
+rustflags = "-C target-feature=+sse"
 
 [alias]
 testall = "hack test --feature-powerset --skip default"

Cargo.toml

@@ -18,6 +18,9 @@ cfg-if = "1.0.0"
 lazy_static = "1.4.0"
 page_size = "0.4.2"
 
+[dev-dependencies]
+anyhow = "1.0.57"
+
 [features]
 default = ["simd"]
 simd = []

README.md

@@ -65,6 +65,7 @@ aligners v0.0.1
 #### Dev
 
 - `cargo-hack` – used for more robust testing by compiling and running the code for the feature powerset.
+- `anyhow` – used in the `simd_alignment_test` to make error handling easy.
 
 ## `crev`
 

tests/simd_alignment_test.rs

@@ -0,0 +1,29 @@
+#[cfg(feature = "simd")]
+mod tests {
+    use anyhow::{bail, Result};
+
+    const EXPECTED_SWITCH_ENV_NAME: &str = "ALIGNERS_TEST_SIMD_EXPECTED_SIZE";
+
+    #[test]
+    #[ignore]
+    pub fn simd_alignment_test() {
+        let verify = verify_simd_block_size();
+        verify.unwrap();
+    }
+
+    pub fn verify_simd_block_size() -> Result<()> {
+        use aligners::alignment::{Alignment, SimdBlock};
+        let expected_size: usize = std::env::var(EXPECTED_SWITCH_ENV_NAME)?.parse()?;
+        let actual_size = SimdBlock::size();
+
+        if expected_size != actual_size {
+            bail!(
+                "Expected SIMD block size was '{}', but actual is '{}'",
+                expected_size,
+                actual_size
+            );
+        }
+
+        Ok(())
+    }
+}