consolidate test helpers

Author: nyurik

src/test_utils.rs

@@ -153,6 +153,54 @@ where
     roundtrip::<fastpfor::CompositeCodec<B, T>>(data);
 }
 
+// ---------------------------------------------------------------------------
+// Compatibility test helpers (used by integration tests)
+// ---------------------------------------------------------------------------
+
+/// Returns various input sizes to test codec behavior (multiples of 128).
+pub fn test_input_sizes() -> Vec<usize> {
+    (1..=8).map(|exp| (1usize << exp) * 128).collect()
+}
+
+/// Generates test data vectors of size `n` with various patterns.
+pub fn get_test_cases(n: usize) -> Vec<Vec<u32>> {
+    use rand::rngs::StdRng;
+    use rand::{RngExt as _, SeedableRng as _};
+    let mut rng = StdRng::seed_from_u64(RNG_SEED);
+
+    vec![
+        // Zeroes
+        vec![0u32; n],
+        // Same non-zero
+        vec![14u32; n],
+        // Ascending values
+        (0..n).map(|i| i as u32).collect::<Vec<u32>>(),
+        // Descending values
+        (0..n).rev().map(|i| i as u32).collect::<Vec<u32>>(),
+        // Bit-flipping pattern
+        (0..n)
+            .map(|i| ((i as u32) * 32) ^ ((i as u32) >> 1))
+            .collect::<Vec<u32>>(),
+        // Alternating large and small values
+        (0..n)
+            .map(|i| {
+                let ui = i as u32;
+                if ui % 2 == 0 { 1 << 30 } else { 3 }
+            })
+            .collect::<Vec<u32>>(),
+        // Random u32 values
+        (0..n)
+            .map(|_| rng.random_range(0..(1 << 31)))
+            .collect::<Vec<u32>>(),
+        // Spike in the middle
+        (0..n)
+            .map(|i| if i == n / 2 { u32::MAX } else { 1 })
+            .collect::<Vec<u32>>(),
+        // An empty vector
+        Vec::new(),
+    ]
+}
+
 // ---------------------------------------------------------------------------
 // Data generators + fixtures (Rust block codecs; benchmarks / smoke tests)
 // ---------------------------------------------------------------------------

tests/basic_tests.rs

@@ -12,8 +12,6 @@ use rand::{RngExt as _, SeedableRng};
 
 use crate::test_utils::{RNG_SEED, block_compress, block_roundtrip_all, roundtrip_all};
 
-mod common;
-
 // ── Tests ─────────────────────────────────────────────────────────────────────
 
 #[test]

tests/common.rs

@@ -11,9 +11,8 @@ mod test_utils;
 use fastpfor::{FastPFor128, FastPFor256, FastPForBlock128};
 use test_utils::{block_compress, block_decompress, compress, roundtrip, roundtrip_full};
 
-mod common;
-use common::{get_test_cases, test_input_sizes};
 use fastpfor::cpp::CppFastPFor128;
+use test_utils::{get_test_cases, test_input_sizes};
 
 use crate::test_utils::decompress;