diff --git a/Cargo.lock b/Cargo.lock
index cd4fcc01..ada170a1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -50,6 +50,55 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "anstream"
+version = "0.6.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8acc5369981196006228e28809f761875c0327210a891e941f4c683b3a99529b"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55cc3b69f167a1ef2e161439aa98aed94e6028e5f9a59be9a6ffb47aef1651f9"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b2d16507662817a6a20a9ea92df6652ee4f94f914589377d69f3b21bc5798a9"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79947af37f4177cfead1110013d678905c37501914fba0efea834c3fe9a8d60c"
+dependencies = [
+ "windows-sys 0.59.0",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2109dbce0e72be3ec00bed26e6a7479ca384ad226efdd66db8fa2e3a38c83125"
+dependencies = [
+ "anstyle",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "arraydeque"
 version = "0.5.1"
@@ -178,6 +227,12 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
+[[package]]
+name = "colorchoice"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b63caa9aa9397e2d9480a9b13673856c78d8ac123288526c37d7839f2a86990"
+
 [[package]]
 name = "config"
 version = "0.14.1"
@@ -200,6 +255,7 @@ dependencies = [
  "serde",
  "serde_derive",
  "serde_json",
+ "snapbox",
  "temp-env",
  "tokio",
  "toml",
@@ -863,6 +919,12 @@ version = "2.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f518f335dce6725a761382244631d86cf0ccb2863413590b31338feb467f9c3"
 
+[[package]]
+name = "is_terminal_polyfill"
+version = "1.70.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf"
+
 [[package]]
 name = "itoa"
 version = "1.0.9"
@@ -1052,6 +1114,12 @@ dependencies = [
  "minimal-lexical",
 ]
 
+[[package]]
+name = "normalize-line-endings"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61807f77802ff30975e01f4f071c8ba10c022052f98b3294119f3e615d13e5be"
+
 [[package]]
 name = "notify"
 version = "7.0.0"
@@ -1647,6 +1715,12 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "similar"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1de1d4f81173b03af4c0cbed3c898f6bff5b870e4a7f5d6f4057d62a7a4b686e"
+
 [[package]]
 name = "slab"
 version = "0.4.9"
@@ -1662,6 +1736,28 @@ version = "1.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
 
+[[package]]
+name = "snapbox"
+version = "0.6.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "96dcfc4581e3355d70ac2ee14cfdf81dce3d85c85f1ed9e2c1d3013f53b3436b"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "normalize-line-endings",
+ "similar",
+ "snapbox-macros",
+]
+
+[[package]]
+name = "snapbox-macros"
+version = "0.3.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16569f53ca23a41bb6f62e0a5084aa1661f4814a67fa33696a79073e03a664af"
+dependencies = [
+ "anstream",
+]
+
 [[package]]
 name = "socket2"
 version = "0.4.10"
@@ -2050,6 +2146,12 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
+[[package]]
+name = "utf8parse"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
+
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
@@ -2283,6 +2385,15 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
+[[package]]
+name = "windows-sys"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "windows-targets"
 version = "0.48.5"
diff --git a/Cargo.toml b/Cargo.toml
index d9397b86..50cae5f4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -148,6 +148,7 @@ glob = "0.3"
 notify = "7.0"
 temp-env = "0.3"
 log = { version = "0.4", features = ["serde"] }
+snapbox = "0.6.21"
 
 [[example]]
 name = "async_source"
diff --git a/tests/testsuite/errors.rs b/tests/testsuite/errors.rs
index 6d2f215c..aa17d0fa 100644
--- a/tests/testsuite/errors.rs
+++ b/tests/testsuite/errors.rs
@@ -1,5 +1,7 @@
-use config::{Config, ConfigError, File, FileFormat, Map, Value};
 use serde_derive::Deserialize;
+use snapbox::{assert_data_eq, str};
+
+use config::{Config, ConfigError, File, FileFormat, Map, Value};
 
 #[test]
 #[cfg(feature = "json")]
@@ -16,8 +18,10 @@ fn test_error_parse() {
         .build();
 
     assert!(res.is_err());
-    let err = res.unwrap_err();
-    assert_eq!(err.to_string(), "trailing comma at line 4 column 1");
+    assert_data_eq!(
+        res.unwrap_err().to_string(),
+        str!["trailing comma at line 4 column 1"]
+    );
 }
 
 #[test]
@@ -38,9 +42,9 @@ fn test_error_type() {
     let res = c.get::<bool>("boolean_s_parse");
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        format!("invalid type: string \"fals\", expected a boolean for key `boolean_s_parse`",)
+        str![[r#"invalid type: string "fals", expected a boolean for key `boolean_s_parse`"#]]
     );
 }
 
@@ -73,10 +77,10 @@ fn test_error_deser_whole() {
         .build()
         .unwrap();
 
-    let err = c.try_deserialize::<Output>().unwrap_err().to_string();
-    assert_eq!(
-        err,
-        "invalid type: string \"Torre di Pisa\", expected an integer for key `place.name`",
+    let res = c.try_deserialize::<Output>();
+    assert_data_eq!(
+        res.unwrap_err().to_string(),
+        str![[r#"invalid type: string "Torre di Pisa", expected an integer for key `place.name`"#]]
     );
 }
 
@@ -99,9 +103,9 @@ fn test_error_type_detached() {
     let res = value.try_deserialize::<bool>();
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        "invalid type: string \"fals\", expected a boolean".to_owned()
+        str![[r#"invalid type: string "fals", expected a boolean"#]]
     );
 }
 
@@ -123,9 +127,9 @@ fn test_error_type_get_bool() {
     let res = c.get_bool("boolean_s_parse");
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        format!("invalid type: string \"fals\", expected a boolean for key `boolean_s_parse`",)
+        str![[r#"invalid type: string "fals", expected a boolean for key `boolean_s_parse`"#]]
     );
 }
 
@@ -147,9 +151,9 @@ fn test_error_type_get_table() {
     let res = c.get_table("debug");
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        format!("invalid type: boolean `true`, expected a map for key `debug`",)
+        str!["invalid type: boolean `true`, expected a map for key `debug`"]
     );
 }
 
@@ -171,9 +175,9 @@ fn test_error_type_get_array() {
     let res = c.get_array("debug");
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        format!("invalid type: boolean `true`, expected an array for key `debug`",)
+        str!["invalid type: boolean `true`, expected an array for key `debug`"]
     );
 }
 
@@ -189,17 +193,14 @@ fn test_error_enum_de() {
 
     let on_v: Value = "on".into();
     let on_d = on_v.try_deserialize::<Diode>();
-    assert_eq!(
+    assert_data_eq!(
         on_d.unwrap_err().to_string(),
-        "enum Diode does not have variant constructor on".to_owned()
+        str!["enum Diode does not have variant constructor on"]
     );
 
     let array_v: Value = vec![100, 100].into();
     let array_d = array_v.try_deserialize::<Diode>();
-    assert_eq!(
-        array_d.unwrap_err().to_string(),
-        "value of enum Diode should be represented by either string or table with exactly one key"
-    );
+    assert_data_eq!(array_d.unwrap_err().to_string(), str!["value of enum Diode should be represented by either string or table with exactly one key"]);
 
     let confused_v: Value = [
         ("Brightness".to_owned(), 100.into()),
@@ -210,10 +211,7 @@ fn test_error_enum_de() {
     .collect::<Map<String, Value>>()
     .into();
     let confused_d = confused_v.try_deserialize::<Diode>();
-    assert_eq!(
-        confused_d.unwrap_err().to_string(),
-        "value of enum Diode should be represented by either string or table with exactly one key"
-    );
+    assert_data_eq!(confused_d.unwrap_err().to_string(), str!["value of enum Diode should be represented by either string or table with exactly one key"]);
 }
 
 #[test]
diff --git a/tests/testsuite/file.rs b/tests/testsuite/file.rs
index 414c3d59..33077852 100644
--- a/tests/testsuite/file.rs
+++ b/tests/testsuite/file.rs
@@ -1,3 +1,5 @@
+use snapbox::{assert_data_eq, str};
+
 use config::{Config, File, FileFormat};
 
 #[test]
@@ -21,9 +23,9 @@ fn test_file_required_not_found() {
         .build();
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        "configuration file \"tests/testsuite/file-nonexistent\" not found".to_owned()
+        str![[r#"configuration file "tests/testsuite/file-nonexistent" not found"#]]
     );
 }
 
@@ -47,9 +49,9 @@ fn test_file_auto_not_found() {
         .build();
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        "configuration file \"tests/testsuite/file-nonexistent\" not found".to_owned()
+        str![[r#"configuration file "tests/testsuite/file-nonexistent" not found"#]]
     );
 }
 
diff --git a/tests/testsuite/file_ini.rs b/tests/testsuite/file_ini.rs
index 78bd6b35..c4c2eba4 100644
--- a/tests/testsuite/file_ini.rs
+++ b/tests/testsuite/file_ini.rs
@@ -2,6 +2,7 @@
 
 use chrono::{DateTime, TimeZone, Utc};
 use serde_derive::Deserialize;
+use snapbox::{assert_data_eq, str};
 
 use config::{Config, File, FileFormat};
 
@@ -72,9 +73,9 @@ error
         .build();
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        format!(r#"4:1 expecting "[Some('='), Some(':')]" but found EOF."#,)
+        str![[r#"4:1 expecting "[Some('='), Some(':')]" but found EOF."#]]
     );
 }
 
diff --git a/tests/testsuite/file_json.rs b/tests/testsuite/file_json.rs
index 57157052..029d687d 100644
--- a/tests/testsuite/file_json.rs
+++ b/tests/testsuite/file_json.rs
@@ -3,6 +3,7 @@
 use chrono::{DateTime, TimeZone, Utc};
 use float_cmp::ApproxEqUlps;
 use serde_derive::Deserialize;
+use snapbox::{assert_data_eq, str};
 
 use config::{Config, File, FileFormat, Map, Value};
 
@@ -108,9 +109,9 @@ fn test_error_parse() {
         .build();
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        format!("expected `:` at line 5 column 1",)
+        str!["expected `:` at line 5 column 1"]
     );
 }
 
diff --git a/tests/testsuite/file_json5.rs b/tests/testsuite/file_json5.rs
index 116c0251..0e64de29 100644
--- a/tests/testsuite/file_json5.rs
+++ b/tests/testsuite/file_json5.rs
@@ -3,6 +3,7 @@
 use chrono::{DateTime, TimeZone, Utc};
 use float_cmp::ApproxEqUlps;
 use serde_derive::Deserialize;
+use snapbox::{assert_data_eq, str};
 
 use config::{Config, File, FileFormat, Map, Value};
 
@@ -109,9 +110,16 @@ fn test_error_parse() {
         .build();
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        format!(" --> 3:7\n  |\n3 |   ok: true\n  |       ^---\n  |\n  = expected null",)
+        str![[r#"
+ --> 3:7
+  |
+3 |   ok: true
+  |       ^---
+  |
+  = expected null
+"#]]
     );
 }
 
diff --git a/tests/testsuite/file_ron.rs b/tests/testsuite/file_ron.rs
index d31441c8..154b806b 100644
--- a/tests/testsuite/file_ron.rs
+++ b/tests/testsuite/file_ron.rs
@@ -3,6 +3,7 @@
 use chrono::{DateTime, TimeZone, Utc};
 use float_cmp::ApproxEqUlps;
 use serde_derive::Deserialize;
+use snapbox::{assert_data_eq, str};
 
 use config::{Config, File, FileFormat, Map, Value};
 
@@ -111,7 +112,7 @@ fn test_error_parse() {
         .build();
 
     assert!(res.is_err());
-    assert_eq!(res.unwrap_err().to_string(), format!("5:1: Expected colon"));
+    assert_data_eq!(res.unwrap_err().to_string(), str!["5:1: Expected colon"]);
 }
 
 #[test]
diff --git a/tests/testsuite/file_toml.rs b/tests/testsuite/file_toml.rs
index c6f210f0..43fa391e 100644
--- a/tests/testsuite/file_toml.rs
+++ b/tests/testsuite/file_toml.rs
@@ -3,6 +3,7 @@
 use chrono::{DateTime, TimeZone, Utc};
 use float_cmp::ApproxEqUlps;
 use serde_derive::Deserialize;
+use snapbox::{assert_data_eq, str};
 
 use config::{Config, File, FileFormat, Map, Value};
 
@@ -154,10 +155,18 @@ error = tru
         .build();
 
     assert!(res.is_err());
-    assert!(res
-        .unwrap_err()
-        .to_string()
-        .contains("TOML parse error at line 3, column 9"));
+    assert_data_eq!(
+        res.unwrap_err().to_string(),
+        str![[r#"
+TOML parse error at line 3, column 9
+  |
+3 | error = tru
+  |         ^
+invalid string
+expected `"`, `'`
+
+"#]]
+    );
 }
 
 #[test]
diff --git a/tests/testsuite/file_yaml.rs b/tests/testsuite/file_yaml.rs
index d36ce079..505245dd 100644
--- a/tests/testsuite/file_yaml.rs
+++ b/tests/testsuite/file_yaml.rs
@@ -5,6 +5,7 @@ use std::collections::HashMap;
 use chrono::{DateTime, TimeZone, Utc};
 use float_cmp::ApproxEqUlps;
 use serde_derive::Deserialize;
+use snapbox::{assert_data_eq, str};
 
 use config::{Config, File, FileFormat, Map, Value};
 
@@ -105,9 +106,9 @@ error false
         .build();
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        "simple key expect ':' at byte 22 line 4 column 1",
+        str!["simple key expect ':' at byte 22 line 4 column 1"]
     );
 }
 
diff --git a/tests/testsuite/get.rs b/tests/testsuite/get.rs
index ae7da271..5f01f397 100644
--- a/tests/testsuite/get.rs
+++ b/tests/testsuite/get.rs
@@ -1,8 +1,10 @@
 use std::collections::HashSet;
 
-use config::{Config, File, FileFormat, Map, Value};
 use float_cmp::ApproxEqUlps;
 use serde_derive::Deserialize;
+use snapbox::{assert_data_eq, str};
+
+use config::{Config, File, FileFormat, Map, Value};
 
 #[test]
 #[cfg(feature = "json")]
@@ -14,9 +16,9 @@ fn test_not_found() {
     let res = c.get::<bool>("not_found");
 
     assert!(res.is_err());
-    assert_eq!(
+    assert_data_eq!(
         res.unwrap_err().to_string(),
-        "configuration property \"not_found\" not found".to_owned()
+        str![[r#"configuration property "not_found" not found"#]]
     );
 }