Initial commit.

adder/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "adder"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

adder/src/lib.rs

@@ -0,0 +1,17 @@
+pub fn add_two(a: i32) -> i32 {
+    internal_add(a, 2)
+}
+
+fn internal_add(a: i32, b: i32) -> i32 {
+    a + b
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn internal() {
+        assert_eq! (4, internal_add(2, 2));
+    }
+}

adder/tests/common/mod.rs

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+pub fn setup() {
+    println! ("特定于库测试的一些设置代码，将放在这里");
+}

adder/tests/integration_test.rs

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+use adder;
+
+mod common;
+
+#[test]
+fn it_adds_two() {
+    common::setup();
+    assert_eq! (6, adder::add_two(4));
+}