Playing with Results in tests

resultteststest/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "resultteststest"
+version = "0.1.0"

resultteststest/Cargo.toml

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+[package]
+name = "resultteststest"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

resultteststest/README.md

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+# ResultTestsTest
+
+Checking how Cargo deals with Results in tests

resultteststest/src/lib.rs

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+fn not_zero(num: usize) -> Result<(), ()> {
+    if num == 0 {
+        Err(())
+    } else {
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn with_result_ok() -> Result<(), ()> {
+        Ok(())
+    }
+
+    #[test]
+    fn with_result_err() -> Result<(), ()> {
+        Err(())
+    }
+
+    #[test]
+    fn nested() -> Result<(), ()> {
+        not_zero(1)?;
+        Ok(())
+    }
+
+    #[test]
+    fn nested2() -> Result<(), ()> {
+        not_zero(0)?;
+        Ok(())
+    }
+
+    #[test]
+    fn nested3() -> Result<(), ()> {
+        let result = (|| {
+            not_zero(2)?;
+            Ok(())
+        })();
+
+        // do something else, like cleaning up the testing workspace
+
+        result
+    }
+}