diff --git a/agb/src/agb_alloc/bump_allocator.rs b/agb/src/agb_alloc/bump_allocator.rs
index 98038629..1fe1ef8a 100644
--- a/agb/src/agb_alloc/bump_allocator.rs
+++ b/agb/src/agb_alloc/bump_allocator.rs
@@ -61,17 +61,22 @@ fn get_data_end() -> usize {
     (unsafe { &__ewram_data_end }) as *const _ as usize
 }
 
-#[test_case]
-fn should_return_data_end_somewhere_in_ewram(_gba: &mut crate::Gba) {
-    let data_end = get_data_end();
+#[cfg(test)]
+mod tests {
+    use super::*;
 
-    assert!(
-        0x0200_0000 <= data_end,
-        "data end should be bigger than 0x0200_0000, got {}",
-        data_end
-    );
-    assert!(
-        0x0204_0000 > data_end,
-        "data end should be smaller than 0x0203_0000"
-    );
+    #[test_case]
+    fn should_return_data_end_somewhere_in_ewram(_gba: &mut crate::Gba) {
+        let data_end = get_data_end();
+
+        assert!(
+            0x0200_0000 <= data_end,
+            "data end should be bigger than 0x0200_0000, got {}",
+            data_end
+        );
+        assert!(
+            0x0204_0000 > data_end,
+            "data end should be smaller than 0x0203_0000"
+        );
+    }
 }
diff --git a/agb/src/bitarray.rs b/agb/src/bitarray.rs
index c237c36c..25c99e16 100644
--- a/agb/src/bitarray.rs
+++ b/agb/src/bitarray.rs
@@ -22,33 +22,36 @@ impl<const N: usize> Bitarray<N> {
         self.a[index / 32] = self.a[index / 32] & !mask | value_mask
     }
 }
-
-#[test_case]
-fn write_and_read(_gba: &mut crate::Gba) {
-    let mut a: Bitarray<2> = Bitarray::new();
-    assert_eq!(a.get(55), Some(false), "expect unset values to be false");
-    a.set(62, true);
-    assert_eq!(a.get(62), Some(true), "expect set value to be true");
-    assert_eq!(a.get(120), None, "expect out of range to give None");
-}
-
-#[test_case]
-fn test_everything(_gba: &mut crate::Gba) {
-    for i in 0..64 {
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test_case]
+    fn write_and_read(_gba: &mut crate::Gba) {
         let mut a: Bitarray<2> = Bitarray::new();
-        a.set(i, true);
-        for j in 0..64 {
-            let expected = i == j;
-            assert_eq!(
-                a.get(j).unwrap(),
-                expected,
-                "set index {} and read {}, expected {} but got {}. u32 of this is {:#b}",
-                i,
-                j,
-                expected,
-                a.get(j).unwrap(),
-                a.a[j / 32],
-            );
+        assert_eq!(a.get(55), Some(false), "expect unset values to be false");
+        a.set(62, true);
+        assert_eq!(a.get(62), Some(true), "expect set value to be true");
+        assert_eq!(a.get(120), None, "expect out of range to give None");
+    }
+
+    #[test_case]
+    fn test_everything(_gba: &mut crate::Gba) {
+        for i in 0..64 {
+            let mut a: Bitarray<2> = Bitarray::new();
+            a.set(i, true);
+            for j in 0..64 {
+                let expected = i == j;
+                assert_eq!(
+                    a.get(j).unwrap(),
+                    expected,
+                    "set index {} and read {}, expected {} but got {}. u32 of this is {:#b}",
+                    i,
+                    j,
+                    expected,
+                    a.get(j).unwrap(),
+                    a.a[j / 32],
+                );
+            }
         }
     }
 }
diff --git a/agb/src/display/example_logo.rs b/agb/src/display/example_logo.rs
index 424a740f..14df97d4 100644
--- a/agb/src/display/example_logo.rs
+++ b/agb/src/display/example_logo.rs
@@ -19,12 +19,16 @@ pub fn display_logo(gfx: &mut BackgroundDistributor) {
     back.show();
     back.commit();
 }
+#[cfg(test)]
+mod tests {
+    use super::*;
 
-#[test_case]
-fn logo_display(gba: &mut crate::Gba) {
-    let mut gfx = gba.display.video.tiled0();
+    #[test_case]
+    fn logo_display(gba: &mut crate::Gba) {
+        let mut gfx = gba.display.video.tiled0();
 
-    display_logo(&mut gfx);
+        display_logo(&mut gfx);
 
-    crate::assert_image_output("gfx/test_logo.png");
+        crate::assert_image_output("gfx/test_logo.png");
+    }
 }
diff --git a/agb/src/interrupt.rs b/agb/src/interrupt.rs
index e6287695..ec364e76 100644
--- a/agb/src/interrupt.rs
+++ b/agb/src/interrupt.rs
@@ -270,37 +270,6 @@ macro_rules! add_interrupt_handler {
     };
 }
 
-#[test_case]
-fn test_vblank_interrupt_handler(_gba: &mut crate::Gba) {
-    {
-        let counter = Mutex::new(0);
-        let counter_2 = Mutex::new(0);
-        add_interrupt_handler!(Interrupt::VBlank, |key| *counter.lock_with_key(&key) += 1);
-        add_interrupt_handler!(Interrupt::VBlank, |_| *counter_2.lock() += 1);
-
-        let vblank = VBlank::get();
-
-        while *counter.lock() < 100 || *counter_2.lock() < 100 {
-            vblank.wait_for_vblank();
-        }
-    }
-
-    assert_eq!(
-        interrupt_to_root(Interrupt::VBlank).next.get(),
-        core::ptr::null(),
-        "expected the interrupt table for vblank to be empty"
-    );
-}
-
-#[test_case]
-fn test_interrupt_table_length(_gba: &mut crate::Gba) {
-    assert_eq!(
-        unsafe { INTERRUPT_TABLE.len() },
-        Interrupt::Gamepak as usize + 1,
-        "interrupt table should be able to store gamepak interrupt"
-    );
-}
-
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
 enum MutexState {
     Unlocked,
@@ -409,3 +378,39 @@ impl Drop for VBlank {
         interrupt_to_root(Interrupt::VBlank).reduce();
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test_case]
+    fn test_vblank_interrupt_handler(_gba: &mut crate::Gba) {
+        {
+            let counter = Mutex::new(0);
+            let counter_2 = Mutex::new(0);
+            add_interrupt_handler!(Interrupt::VBlank, |key| *counter.lock_with_key(&key) += 1);
+            add_interrupt_handler!(Interrupt::VBlank, |_| *counter_2.lock() += 1);
+
+            let vblank = VBlank::get();
+
+            while *counter.lock() < 100 || *counter_2.lock() < 100 {
+                vblank.wait_for_vblank();
+            }
+        }
+
+        assert_eq!(
+            interrupt_to_root(Interrupt::VBlank).next.get(),
+            core::ptr::null(),
+            "expected the interrupt table for vblank to be empty"
+        );
+    }
+
+    #[test_case]
+    fn test_interrupt_table_length(_gba: &mut crate::Gba) {
+        assert_eq!(
+            unsafe { INTERRUPT_TABLE.len() },
+            Interrupt::Gamepak as usize + 1,
+            "interrupt table should be able to store gamepak interrupt"
+        );
+    }
+}
diff --git a/agb/src/lib.rs b/agb/src/lib.rs
index 4127aa80..5f612f8b 100644
--- a/agb/src/lib.rs
+++ b/agb/src/lib.rs
@@ -1,11 +1,12 @@
 #![no_std]
 // This appears to be needed for testing to work
 #![cfg_attr(test, no_main)]
+#![cfg_attr(test, feature(custom_test_frameworks))]
+#![cfg_attr(test, test_runner(crate::test_runner))]
+#![cfg_attr(test, reexport_test_harness_main = "test_main")]
 #![deny(clippy::all)]
-#![feature(custom_test_frameworks)]
 #![feature(alloc_error_handler)]
-#![test_runner(crate::test_runner)]
-#![reexport_test_harness_main = "test_main"]
+
 //! # agb
 //! `agb` is a library for making games on the Game Boy Advance using the Rust
 //! programming language. It attempts to be a high level abstraction over the
diff --git a/agb/src/number.rs b/agb/src/number.rs
index 5983a065..f85f344c 100644
--- a/agb/src/number.rs
+++ b/agb/src/number.rs
@@ -334,55 +334,6 @@ impl<const N: usize> Num<i32, N> {
     }
 }
 
-#[test_case]
-fn sqrt(_gba: &mut crate::Gba) {
-    for x in 1..1024 {
-        let n: Num<i32, 8> = Num::new(x * x);
-        assert_eq!(n.sqrt(), x.into());
-    }
-}
-
-#[test_case]
-fn test_macro_conversion(_gba: &mut super::Gba) {
-    fn test_positive<A: FixedWidthUnsignedInteger, const B: usize>() {
-        let a: Num<A, B> = num!(1.5);
-        let one = A::one() << B;
-        let b = Num::from_raw(one + (one >> 1));
-
-        assert_eq!(a, b);
-    }
-
-    fn test_negative<A: FixedWidthSignedInteger, const B: usize>() {
-        let a: Num<A, B> = num!(-1.5);
-        let one = A::one() << B;
-        let b = Num::from_raw(one + (one >> 1));
-
-        assert_eq!(a, -b);
-    }
-
-    fn test_base<const B: usize>() {
-        test_positive::<i32, B>();
-        test_positive::<u32, B>();
-        test_negative::<i32, B>();
-
-        if B < 16 {
-            test_positive::<u16, B>();
-            test_positive::<i16, B>();
-            test_negative::<i16, B>();
-        }
-    }
-    // some nice powers of two
-    test_base::<8>();
-    test_base::<4>();
-    test_base::<16>();
-    // not a power of two
-    test_base::<10>();
-    // an odd number
-    test_base::<9>();
-    // and a prime
-    test_base::<11>();
-}
-
 impl<I: FixedWidthSignedInteger, const N: usize> Num<I, N> {
     #[must_use]
     pub fn abs(self) -> Self {
@@ -415,129 +366,6 @@ impl<I: FixedWidthSignedInteger, const N: usize> Num<I, N> {
     }
 }
 
-#[test_case]
-fn test_numbers(_gba: &mut super::Gba) {
-    // test addition
-    let n: Num<i32, 8> = 1.into();
-    assert_eq!(n + 2, 3.into(), "testing that 1 + 2 == 3");
-
-    // test multiplication
-    let n: Num<i32, 8> = 5.into();
-    assert_eq!(n * 3, 15.into(), "testing that 5 * 3 == 15");
-
-    // test division
-    let n: Num<i32, 8> = 30.into();
-    let p: Num<i32, 8> = 3.into();
-    assert_eq!(n / 20, p / 2, "testing that 30 / 20 == 3 / 2");
-
-    assert_ne!(n, p, "testing that 30 != 3");
-}
-
-#[test_case]
-fn test_division_by_one(_gba: &mut super::Gba) {
-    let one: Num<i32, 8> = 1.into();
-
-    for i in -40..40 {
-        let n: Num<i32, 8> = i.into();
-        assert_eq!(n / one, n);
-    }
-}
-
-#[test_case]
-fn test_division_and_multiplication_by_16(_gba: &mut super::Gba) {
-    let sixteen: Num<i32, 8> = 16.into();
-
-    for i in -40..40 {
-        let n: Num<i32, 8> = i.into();
-        let m = n / sixteen;
-
-        assert_eq!(m * sixteen, n);
-    }
-}
-
-#[test_case]
-fn test_division_by_2_and_15(_gba: &mut super::Gba) {
-    let two: Num<i32, 8> = 2.into();
-    let fifteen: Num<i32, 8> = 15.into();
-    let thirty: Num<i32, 8> = 30.into();
-
-    for i in -128..128 {
-        let n: Num<i32, 8> = i.into();
-
-        assert_eq!(n / two / fifteen, n / thirty);
-        assert_eq!(n / fifteen / two, n / thirty);
-    }
-}
-
-#[test_case]
-fn test_change_base(_gba: &mut super::Gba) {
-    let two: Num<i32, 9> = 2.into();
-    let three: Num<i32, 4> = 3.into();
-
-    assert_eq!(two + three.change_base(), 5.into());
-    assert_eq!(three + two.change_base(), 5.into());
-}
-
-#[test_case]
-fn test_rem_returns_sensible_values_for_integers(_gba: &mut super::Gba) {
-    for i in -50..50 {
-        for j in -50..50 {
-            if j == 0 {
-                continue;
-            }
-
-            let i_rem_j_normally = i % j;
-            let i_fixnum: Num<i32, 8> = i.into();
-
-            assert_eq!(i_fixnum % j, i_rem_j_normally.into());
-        }
-    }
-}
-
-#[test_case]
-fn test_rem_returns_sensible_values_for_non_integers(_gba: &mut super::Gba) {
-    let one: Num<i32, 8> = 1.into();
-    let third = one / 3;
-
-    for i in -50..50 {
-        for j in -50..50 {
-            if j == 0 {
-                continue;
-            }
-
-            // full calculation in the normal way
-            let x: Num<i32, 8> = third + i;
-            let y: Num<i32, 8> = j.into();
-
-            let truncated_division: Num<i32, 8> = (x / y).trunc().into();
-
-            let remainder = x - truncated_division * y;
-
-            assert_eq!(x % y, remainder);
-        }
-    }
-}
-
-#[test_case]
-fn test_rem_euclid_is_always_positive_and_sensible(_gba: &mut super::Gba) {
-    let one: Num<i32, 8> = 1.into();
-    let third = one / 3;
-
-    for i in -50..50 {
-        for j in -50..50 {
-            if j == 0 {
-                continue;
-            }
-
-            let x: Num<i32, 8> = third + i;
-            let y: Num<i32, 8> = j.into();
-
-            let rem_euclid = x.rem_euclid(y);
-            assert!(rem_euclid > 0.into());
-        }
-    }
-}
-
 impl<I: FixedWidthUnsignedInteger, const N: usize> Display for Num<I, N> {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         let mut integral = self.0 >> N;
@@ -643,15 +471,6 @@ where
     }
 }
 
-#[test_case]
-fn test_vector_multiplication_and_division(_gba: &mut super::Gba) {
-    let a: Vector2D<i32> = (1, 2).into();
-    let b = a * 5;
-    let c = b / 5;
-    assert_eq!(b, (5, 10).into());
-    assert_eq!(a, c);
-}
-
 #[cfg(feature = "alloc")]
 #[cfg(test)]
 mod formatting_tests {
@@ -759,15 +578,6 @@ impl<const N: usize> Vector2D<Num<i32, N>> {
     }
 }
 
-#[test_case]
-fn magnitude_accuracy(_gba: &mut crate::Gba) {
-    let n: Vector2D<Num<i32, 16>> = (3, 4).into();
-    assert!((n.magnitude() - 5).abs() < num!(0.1));
-
-    let n: Vector2D<Num<i32, 8>> = (3, 4).into();
-    assert!((n.magnitude() - 5).abs() < num!(0.1));
-}
-
 impl<T: Number, P: Number + Into<T>> From<(P, P)> for Vector2D<T> {
     fn from(f: (P, P)) -> Self {
         Vector2D::new(f.0.into(), f.1.into())
@@ -934,12 +744,207 @@ impl<T: Number> Vector2D<T> {
     }
 }
 
-#[test_case]
-fn test_vector_changing(_gba: &mut super::Gba) {
-    let v1: Vector2D<FixedNum<8>> = Vector2D::new(1.into(), 2.into());
+#[cfg(test)]
+mod tests {
+    use super::*;
 
-    let v2 = v1.trunc();
-    assert_eq!(v2.get(), (1, 2));
+    #[test_case]
+    fn sqrt(_gba: &mut crate::Gba) {
+        for x in 1..1024 {
+            let n: Num<i32, 8> = Num::new(x * x);
+            assert_eq!(n.sqrt(), x.into());
+        }
+    }
 
-    assert_eq!(v1 + v1, (v2 + v2).into());
+    #[test_case]
+    fn test_macro_conversion(_gba: &mut crate::Gba) {
+        fn test_positive<A: FixedWidthUnsignedInteger, const B: usize>() {
+            let a: Num<A, B> = num!(1.5);
+            let one = A::one() << B;
+            let b = Num::from_raw(one + (one >> 1));
+
+            assert_eq!(a, b);
+        }
+
+        fn test_negative<A: FixedWidthSignedInteger, const B: usize>() {
+            let a: Num<A, B> = num!(-1.5);
+            let one = A::one() << B;
+            let b = Num::from_raw(one + (one >> 1));
+
+            assert_eq!(a, -b);
+        }
+
+        fn test_base<const B: usize>() {
+            test_positive::<i32, B>();
+            test_positive::<u32, B>();
+            test_negative::<i32, B>();
+
+            if B < 16 {
+                test_positive::<u16, B>();
+                test_positive::<i16, B>();
+                test_negative::<i16, B>();
+            }
+        }
+        // some nice powers of two
+        test_base::<8>();
+        test_base::<4>();
+        test_base::<16>();
+        // not a power of two
+        test_base::<10>();
+        // an odd number
+        test_base::<9>();
+        // and a prime
+        test_base::<11>();
+    }
+
+    #[test_case]
+    fn test_numbers(_gba: &mut crate::Gba) {
+        // test addition
+        let n: Num<i32, 8> = 1.into();
+        assert_eq!(n + 2, 3.into(), "testing that 1 + 2 == 3");
+
+        // test multiplication
+        let n: Num<i32, 8> = 5.into();
+        assert_eq!(n * 3, 15.into(), "testing that 5 * 3 == 15");
+
+        // test division
+        let n: Num<i32, 8> = 30.into();
+        let p: Num<i32, 8> = 3.into();
+        assert_eq!(n / 20, p / 2, "testing that 30 / 20 == 3 / 2");
+
+        assert_ne!(n, p, "testing that 30 != 3");
+    }
+
+    #[test_case]
+    fn test_division_by_one(_gba: &mut crate::Gba) {
+        let one: Num<i32, 8> = 1.into();
+
+        for i in -40..40 {
+            let n: Num<i32, 8> = i.into();
+            assert_eq!(n / one, n);
+        }
+    }
+
+    #[test_case]
+    fn test_division_and_multiplication_by_16(_gba: &mut crate::Gba) {
+        let sixteen: Num<i32, 8> = 16.into();
+
+        for i in -40..40 {
+            let n: Num<i32, 8> = i.into();
+            let m = n / sixteen;
+
+            assert_eq!(m * sixteen, n);
+        }
+    }
+
+    #[test_case]
+    fn test_division_by_2_and_15(_gba: &mut crate::Gba) {
+        let two: Num<i32, 8> = 2.into();
+        let fifteen: Num<i32, 8> = 15.into();
+        let thirty: Num<i32, 8> = 30.into();
+
+        for i in -128..128 {
+            let n: Num<i32, 8> = i.into();
+
+            assert_eq!(n / two / fifteen, n / thirty);
+            assert_eq!(n / fifteen / two, n / thirty);
+        }
+    }
+
+    #[test_case]
+    fn test_change_base(_gba: &mut crate::Gba) {
+        let two: Num<i32, 9> = 2.into();
+        let three: Num<i32, 4> = 3.into();
+
+        assert_eq!(two + three.change_base(), 5.into());
+        assert_eq!(three + two.change_base(), 5.into());
+    }
+
+    #[test_case]
+    fn test_rem_returns_sensible_values_for_integers(_gba: &mut crate::Gba) {
+        for i in -50..50 {
+            for j in -50..50 {
+                if j == 0 {
+                    continue;
+                }
+
+                let i_rem_j_normally = i % j;
+                let i_fixnum: Num<i32, 8> = i.into();
+
+                assert_eq!(i_fixnum % j, i_rem_j_normally.into());
+            }
+        }
+    }
+
+    #[test_case]
+    fn test_rem_returns_sensible_values_for_non_integers(_gba: &mut crate::Gba) {
+        let one: Num<i32, 8> = 1.into();
+        let third = one / 3;
+
+        for i in -50..50 {
+            for j in -50..50 {
+                if j == 0 {
+                    continue;
+                }
+
+                // full calculation in the normal way
+                let x: Num<i32, 8> = third + i;
+                let y: Num<i32, 8> = j.into();
+
+                let truncated_division: Num<i32, 8> = (x / y).trunc().into();
+
+                let remainder = x - truncated_division * y;
+
+                assert_eq!(x % y, remainder);
+            }
+        }
+    }
+
+    #[test_case]
+    fn test_rem_euclid_is_always_positive_and_sensible(_gba: &mut crate::Gba) {
+        let one: Num<i32, 8> = 1.into();
+        let third = one / 3;
+
+        for i in -50..50 {
+            for j in -50..50 {
+                if j == 0 {
+                    continue;
+                }
+
+                let x: Num<i32, 8> = third + i;
+                let y: Num<i32, 8> = j.into();
+
+                let rem_euclid = x.rem_euclid(y);
+                assert!(rem_euclid > 0.into());
+            }
+        }
+    }
+
+    #[test_case]
+    fn test_vector_multiplication_and_division(_gba: &mut crate::Gba) {
+        let a: Vector2D<i32> = (1, 2).into();
+        let b = a * 5;
+        let c = b / 5;
+        assert_eq!(b, (5, 10).into());
+        assert_eq!(a, c);
+    }
+
+    #[test_case]
+    fn magnitude_accuracy(_gba: &mut crate::Gba) {
+        let n: Vector2D<Num<i32, 16>> = (3, 4).into();
+        assert!((n.magnitude() - 5).abs() < num!(0.1));
+
+        let n: Vector2D<Num<i32, 8>> = (3, 4).into();
+        assert!((n.magnitude() - 5).abs() < num!(0.1));
+    }
+
+    #[test_case]
+    fn test_vector_changing(_gba: &mut crate::Gba) {
+        let v1: Vector2D<FixedNum<8>> = Vector2D::new(1.into(), 2.into());
+
+        let v2 = v1.trunc();
+        assert_eq!(v2.get(), (1, 2));
+
+        assert_eq!(v1 + v1, (v2 + v2).into());
+    }
 }
diff --git a/agb/src/syscall.rs b/agb/src/syscall.rs
index b4357c58..ddeed8f0 100644
--- a/agb/src/syscall.rs
+++ b/agb/src/syscall.rs
@@ -151,12 +151,17 @@ pub fn affine_matrix(
     result
 }
 
-#[test_case]
-fn affine(_gba: &mut crate::Gba) {
-    // expect identity matrix
-    let one: Num<i16, 8> = 1.into();
+#[cfg(test)]
+mod tests {
+    use super::*;
 
-    let aff = affine_matrix(one, one, 0);
-    assert_eq!(aff.p_a, one.to_raw());
-    assert_eq!(aff.p_d, one.to_raw());
+    #[test_case]
+    fn affine(_gba: &mut crate::Gba) {
+        // expect identity matrix
+        let one: Num<i16, 8> = 1.into();
+
+        let aff = affine_matrix(one, one, 0);
+        assert_eq!(aff.p_a, one.to_raw());
+        assert_eq!(aff.p_d, one.to_raw());
+    }
 }