diff --git a/Cargo.toml b/Cargo.toml
index 6ca65d2..5810c31 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,8 @@ repository = "https://github.com/InstantDomainSearch/instant-segment"
 documentation = "https://docs.rs/instant-segment"
 
 [features]
-__test_data = []
+__test_data = ["testcases"]
+testcases = []
 
 [dependencies]
 ahash = "0.7.0"
diff --git a/src/lib.rs b/src/lib.rs
index 5b9ea99..1f320db 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,6 +6,8 @@ use smartstring::alias::String;
 
 #[cfg(feature = "__test_data")]
 pub mod test_data;
+#[cfg(feature = "testcases")]
+pub mod testcases;
 
 /// Central data structure used to calculate word probabilities
 pub struct Segmenter {
diff --git a/src/test_data.rs b/src/test_data.rs
index 15cee34..5a4f8a7 100644
--- a/src/test_data.rs
+++ b/src/test_data.rs
@@ -7,6 +7,11 @@ use std::str::FromStr;
 
 use super::Segmenter;
 
+#[test]
+fn test_data() {
+    crate::testcases::run(segmenter());
+}
+
 pub fn segmenter() -> Segmenter {
     let dir = PathBuf::from(format!("{}/data", env!("CARGO_MANIFEST_DIR")));
 
diff --git a/tests/basic.rs b/src/testcases.rs
similarity index 57%
rename from tests/basic.rs
rename to src/testcases.rs
index b15cfc5..3cd008e 100644
--- a/tests/basic.rs
+++ b/src/testcases.rs
@@ -1,22 +1,31 @@
-#![cfg(feature = "__test_data")]
+use crate::Segmenter;
 
-use once_cell::sync::Lazy;
-
-use instant_segment::Segmenter;
-
-#[test]
-fn test_segment_0() {
-    assert_segments(&["choose", "spain"]);
+/// Run a segmenter against the built-in test cases
+pub fn run(segmenter: Segmenter) {
+    for test in TEST_CASES.iter().copied() {
+        let mut out = Vec::new();
+        segmenter.segment(&test.join(""), &mut out);
+        let cmp = out.iter().map(|s| &*s).collect::<Vec<_>>();
+        assert_eq!(cmp, test);
+    }
 }
 
-#[test]
-fn test_segment_1() {
-    assert_segments(&["this", "is", "a", "test"]);
-}
-
-#[test]
-fn test_segment_2() {
-    assert_segments(&[
+/// Built-in test cases
+///
+/// These are exposed so that you can test with different data sources.
+pub const TEST_CASES: &[&[&str]] = &[
+    &["choose", "spain"],
+    &["this", "is", "a", "test"],
+    &["who", "represents"],
+    &["experts", "exchange"],
+    &["speed", "of", "art"],
+    &["now", "is", "the", "time", "for", "all", "good"],
+    &["it", "is", "a", "truth", "universally", "acknowledged"],
+    &[
+        "it", "was", "a", "bright", "cold", "day", "in", "april", "and", "the", "clocks", "were",
+        "striking", "thirteen",
+    ],
+    &[
         "when",
         "in",
         "the",
@@ -27,45 +36,8 @@ fn test_segment_2() {
         "it",
         "becomes",
         "necessary",
-    ]);
-}
-
-#[test]
-fn test_segment_3() {
-    assert_segments(&["who", "represents"]);
-}
-
-#[test]
-fn test_segment_4() {
-    assert_segments(&["experts", "exchange"]);
-}
-
-#[test]
-fn test_segment_5() {
-    assert_segments(&["speed", "of", "art"]);
-}
-
-#[test]
-fn test_segment_6() {
-    assert_segments(&["now", "is", "the", "time", "for", "all", "good"]);
-}
-
-#[test]
-fn test_segment_7() {
-    assert_segments(&["it", "is", "a", "truth", "universally", "acknowledged"]);
-}
-
-#[test]
-fn test_segment_8() {
-    assert_segments(&[
-        "it", "was", "a", "bright", "cold", "day", "in", "april", "and", "the", "clocks", "were",
-        "striking", "thirteen",
-    ]);
-}
-
-#[test]
-fn test_segment_9() {
-    assert_segments(&[
+    ],
+    &[
         "it",
         "was",
         "the",
@@ -90,12 +62,8 @@ fn test_segment_9() {
         "age",
         "of",
         "foolishness",
-    ]);
-}
-
-#[test]
-fn test_segment_10() {
-    assert_segments(&[
+    ],
+    &[
         "as",
         "gregor",
         "samsa",
@@ -116,23 +84,15 @@ fn test_segment_10() {
         "a",
         "gigantic",
         "insect",
-    ]);
-}
-
-#[test]
-fn test_segment_11() {
-    assert_segments(&[
+    ],
+    &[
         "in", "a", "hole", "in", "the", "ground", "there", "lived", "a", "hobbit", "not", "a",
         "nasty", "dirty", "wet", "hole", "filled", "with", "the", "ends", "of", "worms", "and",
         "an", "oozy", "smell", "nor", "yet", "a", "dry", "bare", "sandy", "hole", "with",
         "nothing", "in", "it", "to", "sit", "down", "on", "or", "to", "eat", "it", "was", "a",
         "hobbit", "hole", "and", "that", "means", "comfort",
-    ]);
-}
-
-#[test]
-fn test_segment_12() {
-    assert_segments(&[
+    ],
+    &[
         "far",
         "out",
         "in",
@@ -158,14 +118,5 @@ fn test_segment_12() {
         "regarded",
         "yellow",
         "sun",
-    ]);
-}
-
-fn assert_segments(s: &[&str]) {
-    let mut out = Vec::new();
-    SEGMENTER.segment(&s.join(""), &mut out);
-    let cmp = out.iter().map(|s| &*s).collect::<Vec<_>>();
-    assert_eq!(cmp, s);
-}
-
-static SEGMENTER: Lazy<Segmenter> = Lazy::new(instant_segment::test_data::segmenter);
+    ],
+];