diff --git a/src/i256/mod.rs b/src/i256/mod.rs
index e8597a7..cf55741 100644
--- a/src/i256/mod.rs
+++ b/src/i256/mod.rs
@@ -195,17 +195,17 @@ mod tests {
     use super::*;
 
     #[test]
-    fn it_calculates_min() {
+    fn min() {
         assert_eq!(i128::try_from(I256::I128_MIN).unwrap(), i128::MIN);
     }
 
     #[test]
-    fn it_calculates_max() {
+    fn max() {
         assert_eq!(i128::try_from(I256::I128_MAX).unwrap(), i128::MAX);
     }
 
     #[test]
-    fn it_compares() {
+    fn cmp() {
         use core::cmp::Ordering::{self, *};
         fn t(a: i128, b: i128, ord: Ordering) {
             let a = I256::from(a);
@@ -219,7 +219,7 @@ mod tests {
     }
 
     #[test]
-    fn it_converts_i256_from_i128() {
+    fn from_i128() {
         fn t(x: i128) {
             assert_eq!(i128::try_from(I256::from(x)).unwrap(), x);
         }
@@ -233,7 +233,7 @@ mod tests {
     }
 
     #[test]
-    fn it_negates_i128() {
+    fn neg_i128() {
         fn t(x: i128) {
             assert_eq!(i128::try_from(-I256::from(x)).unwrap(), -x);
             assert_eq!(i128::try_from(-I256::from(-x)).unwrap(), x);
@@ -245,7 +245,7 @@ mod tests {
     }
 
     #[test]
-    fn it_negates_i256() {
+    fn neg_i256() {
         fn t(value: I256, expected: I256) {
             let actual: I256 = -value;
             assert_eq!(actual, expected);
@@ -270,12 +270,12 @@ mod tests {
 
     #[test]
     #[should_panic]
-    fn it_doesnt_negate_i256_min() {
+    fn neg_i256_min() {
         let _x = -I256::MIN;
     }
 
     #[test]
-    fn it_adds() {
+    fn add() {
         fn t(a: i128, b: i128, expected: i128) {
             let a = I256::from(a);
             let b = I256::from(b);
@@ -291,7 +291,7 @@ mod tests {
     }
 
     #[test]
-    fn it_subtracts() {
+    fn sub() {
         fn t(a: i128, b: i128, expected: i128) {
             let a = I256::from(a);
             let b = I256::from(b);
@@ -307,7 +307,7 @@ mod tests {
     }
 
     #[test]
-    fn it_multiplies() {
+    fn mul() {
         fn t(a: i128, b: i128, expected: i128) {
             let a = I256::from(a);
             let b = I256::from(b);
@@ -322,7 +322,7 @@ mod tests {
     }
 
     #[test]
-    fn it_divides() {
+    fn div() {
         fn t(a: i128, b: i128, expected: i128) {
             let a = I256::from(a);
             let b = I256::from(b);
diff --git a/src/i256/u256.rs b/src/i256/u256.rs
index 5765698..9b30cf5 100644
--- a/src/i256/u256.rs
+++ b/src/i256/u256.rs
@@ -853,7 +853,7 @@ mod tests {
     use super::*;
 
     #[test]
-    fn it_counts_leading_zeros() {
+    fn leading_zeros() {
         fn t(x: U256, expected: u32) {
             assert_eq!(x.leading_zeros(), expected);
         }
diff --git a/tests/it/const_ctor/mod.rs b/tests/it/const_ctor/mod.rs
new file mode 100644
index 0000000..9b30c37
--- /dev/null
+++ b/tests/it/const_ctor/mod.rs
@@ -0,0 +1,21 @@
+use fixnum::{fixnum_const, FixedPoint};
+
+#[test]
+fn valid() {
+    type F64p9 = FixedPoint<i64, typenum::U9>;
+
+    const SAMPLE0: F64p9 = fixnum_const!(42.42, 9);
+    assert_eq!(SAMPLE0, F64p9::from_decimal(4242, -2).unwrap());
+
+    const SAMPLE1: F64p9 = fixnum_const!(42, 9);
+    assert_eq!(SAMPLE1, F64p9::from_decimal(42, 0).unwrap());
+
+    const SAMPLE2: F64p9 = fixnum_const!(42., 9);
+    assert_eq!(SAMPLE2, F64p9::from_decimal(42, 0).unwrap());
+}
+
+#[test]
+fn too_long_fractional() {
+    let test_cases = trybuild::TestCases::new();
+    test_cases.compile_fail("tests/it/const_ctor/too_long_fractional.rs");
+}
diff --git a/tests/const_fn/01_fixnum_const_bad_str_with_too_long_fractional_part.rs b/tests/it/const_ctor/too_long_fractional.rs
similarity index 100%
rename from tests/const_fn/01_fixnum_const_bad_str_with_too_long_fractional_part.rs
rename to tests/it/const_ctor/too_long_fractional.rs
diff --git a/tests/const_fn/01_fixnum_const_bad_str_with_too_long_fractional_part.stderr b/tests/it/const_ctor/too_long_fractional.stderr
similarity index 86%
rename from tests/const_fn/01_fixnum_const_bad_str_with_too_long_fractional_part.stderr
rename to tests/it/const_ctor/too_long_fractional.stderr
index 753ccef..50912d3 100644
--- a/tests/const_fn/01_fixnum_const_bad_str_with_too_long_fractional_part.stderr
+++ b/tests/it/const_ctor/too_long_fractional.stderr
@@ -7,7 +7,7 @@ error: constant evaluation is taking a long time
   = note: this lint makes sure the compiler doesn't get stuck due to infinite loops in const eval.
           If your compilation actually takes a long time, you can safely allow the lint.
 help: the constant being evaluated
- --> tests/const_fn/01_fixnum_const_bad_str_with_too_long_fractional_part.rs:7:36
+ --> tests/it/const_ctor/too_long_fractional.rs:7:36
   |
 7 | const VALUE: FixedPoint<i64, U9> = fixnum_const!(0.1234567891, 9);
   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -15,7 +15,7 @@ help: the constant being evaluated
   = note: this error originates in the macro `const_assert` which comes from the expansion of the macro `fixnum_const` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: erroneous constant used
- --> tests/const_fn/01_fixnum_const_bad_str_with_too_long_fractional_part.rs:7:36
+ --> tests/it/const_ctor/too_long_fractional.rs:7:36
   |
 7 | const VALUE: FixedPoint<i64, U9> = fixnum_const!(0.1234567891, 9);
   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/tests/test_convert.rs b/tests/it/convert.rs
similarity index 99%
rename from tests/test_convert.rs
rename to tests/it/convert.rs
index 0bf237f..60c99b7 100644
--- a/tests/test_convert.rs
+++ b/tests/it/convert.rs
@@ -4,8 +4,6 @@ use proptest::prelude::*;
 
 use fixnum::ops::Bounded;
 
-mod macros;
-
 #[test]
 fn from_decimal() -> Result<()> {
     test_fixed_point! {
diff --git a/tests/test_convert_f64.rs b/tests/it/convert_f64.rs
similarity index 99%
rename from tests/test_convert_f64.rs
rename to tests/it/convert_f64.rs
index d7438c2..aadb5a4 100644
--- a/tests/test_convert_f64.rs
+++ b/tests/it/convert_f64.rs
@@ -4,8 +4,6 @@ use proptest::prelude::*;
 
 use fixnum::*;
 
-mod macros;
-
 #[test]
 #[allow(clippy::float_cmp)]
 fn to_f64() -> Result<()> {
diff --git a/tests/test_convert_string.rs b/tests/it/convert_str.rs
similarity index 99%
rename from tests/test_convert_string.rs
rename to tests/it/convert_str.rs
index 2e77968..df0e47e 100644
--- a/tests/test_convert_string.rs
+++ b/tests/it/convert_str.rs
@@ -7,9 +7,7 @@ use anyhow::Result;
 #[cfg(feature = "i128")]
 use proptest::prelude::*;
 
-use self::macros::TestCaseResult;
-
-mod macros;
+use crate::TestCaseResult;
 
 #[test]
 #[allow(overflowing_literals)]
diff --git a/tests/macros.rs b/tests/it/main.rs
similarity index 89%
rename from tests/macros.rs
rename to tests/it/main.rs
index a9f5628..6bad759 100644
--- a/tests/macros.rs
+++ b/tests/it/main.rs
@@ -1,7 +1,4 @@
-#![allow(dead_code)]
-
-/// Testing helper macro. Allows to use generalized `FixedPoint` and `Layout` types in the test cases.
-#[macro_export]
+/// Allows to use generalized `FixedPoint` and `Layout` types in the test cases.
 macro_rules! test_fixed_point {
     (
         case ($( $case_pattern:ident: $case_type:ty ),* $( , )?) => $case:block,
@@ -11,7 +8,7 @@ macro_rules! test_fixed_point {
     ) => {{
         macro_rules! impl_test_case {
             () => {
-                fn test_case($( $case_pattern: $case_type ),*) -> $crate::macros::TestCaseResult {
+                fn test_case($( $case_pattern: $case_type ),*) -> $crate::TestCaseResult {
                     $case
                     Ok(())
                 }
@@ -90,15 +87,15 @@ macro_rules! test_fixed_point {
     };
     (@suite_passes {$( ($( $args:expr )*) )*}) => {
         $(
-            $crate::macros::r#impl::catch_and_augment(stringify!($( $args ),*), || {
+            $crate::r#impl::catch_and_augment(stringify!($( $args ),*), || {
                 test_case($( $args ),*)
             })?;
         )*
     };
     (@suite_fails {$( ($( $args:expr )*) )*}) => {
         $(
-            $crate::macros::r#impl::catch_and_augment(stringify!($( $args ),*), || {
-                $crate::macros::r#impl::assert_fails(|| test_case($( $args ),*));
+            $crate::r#impl::catch_and_augment(stringify!($( $args ),*), || {
+                $crate::r#impl::assert_fails(|| test_case($( $args ),*));
                 Ok(())
             })?;
         )*
@@ -108,8 +105,8 @@ macro_rules! test_fixed_point {
 use std::fmt::Display;
 
 // Use a special error based on `Display` in order to support `nostd`.
-pub(crate) type TestCaseResult = Result<(), TestCaseError>;
-pub(crate) struct TestCaseError(Box<dyn Display>);
+type TestCaseResult = Result<(), TestCaseError>;
+struct TestCaseError(Box<dyn Display>);
 
 impl<E: Display + 'static> From<E> for TestCaseError {
     fn from(error: E) -> Self {
@@ -125,7 +122,7 @@ impl From<TestCaseError> for anyhow::Error {
 }
 
 #[cfg(not(feature = "std"))]
-pub(crate) mod r#impl {
+mod r#impl {
     use anyhow::Result;
 
     use super::TestCaseResult;
@@ -141,7 +138,7 @@ pub(crate) mod r#impl {
 }
 
 #[cfg(feature = "std")]
-pub(crate) mod r#impl {
+mod r#impl {
     use std::panic::{catch_unwind, AssertUnwindSafe};
 
     use anyhow::{anyhow, Context, Result};
@@ -180,3 +177,11 @@ pub(crate) mod r#impl {
         }
     }
 }
+
+// Tests
+mod const_ctor;
+mod convert;
+mod convert_f64;
+mod convert_str;
+mod ops;
+mod serde;
diff --git a/tests/test_ops.rs b/tests/it/ops.rs
similarity index 99%
rename from tests/test_ops.rs
rename to tests/it/ops.rs
index 6dd60e8..05b675b 100644
--- a/tests/test_ops.rs
+++ b/tests/it/ops.rs
@@ -7,8 +7,6 @@ use fixnum::{
     *,
 };
 
-mod macros;
-
 #[test]
 fn cmul_overflow() -> Result<()> {
     test_fixed_point! {
diff --git a/tests/test_serde.rs b/tests/it/serde.rs
similarity index 99%
rename from tests/test_serde.rs
rename to tests/it/serde.rs
index 02c1942..40cca8c 100644
--- a/tests/test_serde.rs
+++ b/tests/it/serde.rs
@@ -4,8 +4,6 @@ use anyhow::Result;
 use derive_more::{From, Into};
 use serde::{Deserialize, Serialize};
 
-mod macros;
-
 #[test]
 fn display_and_serde() -> Result<()> {
     test_fixed_point! {
diff --git a/tests/test_const_fn.rs b/tests/test_const_fn.rs
deleted file mode 100644
index 81d2be3..0000000
--- a/tests/test_const_fn.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-#[test]
-fn const_fn() {
-    let test_cases = trybuild::TestCases::new();
-    test_cases
-        .compile_fail("tests/const_fn/01_fixnum_const_bad_str_with_too_long_fractional_part.rs");
-}