5 files changed, 55 insertions, 0 deletions
diff --git a/rust-book/testing/Cargo.lock b/rust-book/testing/Cargo.lock
new file mode 100755
index 0000000..f38ac62
--- /dev/null
+++ b/rust-book/testing/Cargo.lock
@@ -0,0 +1,4 @@
+[[package]]
+name = "testing"
+version = "0.1.0"
+
diff --git a/rust-book/testing/Cargo.toml b/rust-book/testing/Cargo.toml
new file mode 100755
index 0000000..665256c
--- /dev/null
+++ b/rust-book/testing/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "testing"
+version = "0.1.0"
+authors = ["carpenat"]
+edition = "2018"
+
+[dependencies]
diff --git a/rust-book/testing/src/lib.rs b/rust-book/testing/src/lib.rs
new file mode 100755
index 0000000..9ce4804
--- /dev/null
+++ b/rust-book/testing/src/lib.rs
@@ -0,0 +1,32 @@
+pub fn add_two(a: i32) -> i32 {
+    internal_adder(a, 2)
+}
+
+fn internal_adder(a: i32, b: i32) -> i32 {
+    a + b
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn add_two_and_two() {
+        assert_eq!(4, add_two(2));
+    }
+
+    #[test]
+    fn add_three_and_two() {
+        assert_eq!(5, add_two(3));
+    }
+
+    #[test]
+    #[ignore]
+    fn one_hundred() {
+        assert_eq!(102, add_two(100));
+    }
+
+    fn internal() {
+        assert_eq!(4, internal_adder(2, 2));
+    }
+}
diff --git a/rust-book/testing/tests/common/mod.rs b/rust-book/testing/tests/common/mod.rs
new file mode 100755
index 0000000..c00b3a6
--- /dev/null
+++ b/rust-book/testing/tests/common/mod.rs
@@ -0,0 +1,3 @@
+pub fn setup() {
+    // setup code
+}
diff --git a/rust-book/testing/tests/integration_test.rs b/rust-book/testing/tests/integration_test.rs
new file mode 100755
index 0000000..ce04ce3
--- /dev/null
+++ b/rust-book/testing/tests/integration_test.rs
@@ -0,0 +1,9 @@
+use testing;
+mod common;
+
+#[test]
+fn it_adds_two() {
+    common::setup();
+    assert_eq!(4, testing::add_two(2));
+}
+