diff --git a/src/lib.rs b/src/lib.rs
index 984d9cb..675b812 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -68,7 +68,7 @@ use syn::{Item, ItemStruct, ItemType};
 #[cfg(feature = "executable")]
 use which::which;
 
-use crate::utils::{fn_macro, is_module, mod_macro};
+use crate::utils::{fn_macro, is_module, mod_macro, sanitize_env_vars_attr};
 
 mod utils;
 
@@ -130,14 +130,20 @@ pub fn env(attr: TokenStream, stream: TokenStream) -> TokenStream {
 }
 
 fn check_env_condition(attr_str: String) -> (bool, String) {
-    let var_names: Vec<&str> = attr_str.split(',').collect();
+    let var_names = sanitize_env_vars_attr(&attr_str);
+
+    // Check if the environment variables are set
     let mut missing_vars = vec![];
-    for var in var_names.iter() {
-        if std::env::var(var).is_err() {
-            missing_vars.push(var.to_string());
+    for name in var_names {
+        if std::env::var(name).is_err() {
+            missing_vars.push(name.to_string());
         }
     }
-    let ignore_msg = if missing_vars.len() == 1 {
+
+    // Generate ignore message
+    let ignore_msg = if missing_vars.is_empty() {
+        String::new()
+    } else if missing_vars.len() == 1 {
         format!("because variable {} not found", missing_vars[0])
     } else {
         format!(
@@ -145,6 +151,7 @@ fn check_env_condition(attr_str: String) -> (bool, String) {
             missing_vars.join(", ")
         )
     };
+
     (missing_vars.is_empty(), ignore_msg)
 }
 
@@ -2520,3 +2527,146 @@ pub fn runtime_ignore_if(attr: TokenStream, stream: TokenStream) -> TokenStream
     }
     .into()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::check_env_condition;
+
+    mod env_macro {
+        use super::*;
+
+        #[test]
+        fn single_env_var_should_be_not_set() {
+            //* Given
+            let env_var = "A_RIDICULOUS_ENV_VAR_NAME_THAT_SHOULD_NOT_BE_SET";
+
+            // The `test_with::env(<attr_str>)` macro arguments
+            let attr_str = env_var.to_string();
+
+            //* When
+            let (is_ok, ignore_msg) = check_env_condition(attr_str);
+
+            //* Then
+            // Assert if the test should be ignored
+            assert!(!is_ok);
+            // Assert the ignore message should contain only the missing env var names
+            assert!(ignore_msg.contains(env_var));
+        }
+
+        #[test]
+        fn multiple_env_vars_should_not_be_set() {
+            //* Given
+            let env_var1 = "A_RIDICULOUS_ENV_VAR_NAME_THAT_SHOULD_NOT_BE_SET";
+            let env_var2 = "ANOTHER_RIDICULOUS_ENV_VAR_NAME_THAT_SHOULD_NOT_BE_SET";
+
+            // The `test_with::env(<attr_str>)` macro arguments
+            let attr_str = format!("{}, {}", env_var1, env_var2);
+
+            //* When
+            let (is_ok, ignore_msg) = check_env_condition(attr_str);
+
+            //* Then
+            // Assert if the test should be ignored
+            assert!(!is_ok);
+            // Assert the ignore message should contain only the missing env var names
+            assert!(ignore_msg.contains(env_var1));
+            assert!(ignore_msg.contains(env_var2));
+        }
+
+        #[test]
+        fn single_env_var_should_be_set() {
+            //* Given
+            let env_var = "PATH";
+
+            // The `test_with::env(<attr_str>)` macro arguments
+            let attr_str = env_var.to_string();
+
+            //* When
+            let (is_ok, ignore_msg) = check_env_condition(attr_str);
+
+            //* Then
+            // Assert if the test should be ignored
+            assert!(is_ok);
+            // Assert the ignore message should contain only the missing env var names
+            assert!(!ignore_msg.contains(env_var));
+        }
+
+        /// Test the `test_with::env(<attr_str>)` macro should parse the attribute string correctly
+        /// when the attribute string contains multiple env vars containing spaces and newlines.
+        ///
+        /// ```no_run
+        /// #[test_with::env(
+        ///   PATH,
+        ///   HOME
+        /// )]
+        /// #[test]
+        /// fn some_test() {}
+        #[test]
+        fn multiple_env_vars_should_be_set() {
+            //* Given
+            let env_var1 = "PATH";
+            let env_var2 = "HOME";
+
+            // The `test_with::env(<attr_str>)` macro arguments
+            let attr_str = format!("\t{},\n\t{}\n", env_var1, env_var2);
+
+            //* When
+            let (is_ok, ignore_msg) = check_env_condition(attr_str);
+
+            //* Then
+            // Assert if the test should be ignored
+            assert!(is_ok);
+            // Assert the ignore message should contain only the missing env var names
+            assert!(!ignore_msg.contains(env_var1));
+            assert!(!ignore_msg.contains(env_var2));
+        }
+
+        /// Test the `test_with::env(<attr_str>)` macro should parse the attribute string correctly
+        /// when the attribute string contains multiple env vars and one of them is not set.
+        #[test]
+        fn multiple_env_vars_but_one_is_not_set() {
+            //* Given
+            let env_var1 = "PATH";
+            let env_var2 = "HOME";
+            let env_var3 = "A_RIDICULOUS_ENV_VAR_NAME_THAT_SHOULD_NOT_BE_SET";
+
+            // The `test_with::env(<attr_str>)` macro arguments
+            let attr_str = format!("{}, {}, {}", env_var1, env_var2, env_var3);
+
+            //* When
+            let (is_ok, ignore_msg) = check_env_condition(attr_str);
+
+            //* Then
+            // Assert if the test should be ignored
+            assert!(!is_ok);
+            // Assert the ignore message should contain only the missing env var names
+            assert!(!ignore_msg.contains(env_var1));
+            assert!(!ignore_msg.contains(env_var2));
+            assert!(ignore_msg.contains(env_var3));
+        }
+
+        /// Test the `test_with::env(<attr_str>)` macro should parse the attribute string correctly
+        /// when the attribute string contains multiple env vars and various of them are not set.
+        #[test]
+        fn multiple_env_vars_and_various_not_set() {
+            //* Given
+            let env_var1 = "PATH";
+            let env_var2 = "A_RIDICULOUS_ENV_VAR_NAME_THAT_SHOULD_NOT_BE_SET";
+            let env_var3 = "ANOHTER_RIDICULOUS_ENV_VAR_NAME_THAT_SHOULD_NOT_BE_SET";
+
+            // The `test_with::env(<attr_str>)` macro arguments
+            let attr_str = format!("{}, {}, {}", env_var1, env_var2, env_var3);
+
+            //* When
+            let (is_ok, ignore_msg) = check_env_condition(attr_str);
+
+            //* Then
+            // Assert if the test should be ignored
+            assert!(!is_ok);
+            // Assert the ignore message should contain only the missing env var names
+            assert!(!ignore_msg.contains(env_var1));
+            assert!(ignore_msg.contains(env_var2));
+            assert!(ignore_msg.contains(env_var3));
+        }
+    }
+}
diff --git a/src/utils.rs b/src/utils.rs
index 29168f5..ba82194 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -257,3 +257,58 @@ pub(crate) fn mod_macro(
         abort_call_site!("should use on mod with context")
     }
 }
+
+/// Sanitize the attribute string to remove any leading or trailing whitespace
+/// and split the string into an iterator of individual environment variable names.
+pub fn sanitize_env_vars_attr(attr_str: &str) -> impl Iterator<Item=&str> {
+    attr_str.split(',').map(str::trim)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::sanitize_env_vars_attr;
+
+    #[test]
+    fn sanitize_single_env_var() {
+        //* Given
+        let env_var = "FOO";
+
+        let attr_str = env_var.to_string();
+
+        //* When
+        let result = sanitize_env_vars_attr(&attr_str).collect::<Vec<_>>();
+
+        //* Then
+        assert_eq!(result, vec!["FOO"]);
+    }
+
+    #[test]
+    fn sanitize_multiple_env_vars() {
+        //* Given
+        let env_var1 = "FOO";
+        let env_var2 = "BAR";
+        let env_var3 = "BAZ";
+
+        let attr_str = format!("\t{},\n\t{},\n\t{}", env_var1, env_var2, env_var3);
+
+        //* When
+        let result = sanitize_env_vars_attr(&attr_str).collect::<Vec<_>>();
+
+        //* Then
+        assert_eq!(result, vec!["FOO", "BAR", "BAZ"]);
+    }
+
+    #[test]
+    fn sanitize_env_vars_with_whitespace() {
+        //* Given
+        let env_var = "FOO BAR";
+
+        let attr_str = env_var.to_string();
+
+        //* When
+        let result = sanitize_env_vars_attr(&attr_str).collect::<Vec<_>>();
+
+        //* Then
+        assert_eq!(result, vec!["FOO BAR"]);
+    }
+}