proverb

rust/proverb/tests/proverb.rs

@@ -0,0 +1,75 @@
+use proverb::*;
+
+#[test]
+fn zero_pieces() {
+    let input = &[];
+    let output = build_proverb(input);
+    let expected = String::new();
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn one_piece() {
+    let input = &["nail"];
+    let output = build_proverb(input);
+    let expected: String = ["And all for the want of a nail."].join("\n");
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn two_pieces() {
+    let input = &["nail", "shoe"];
+    let output = build_proverb(input);
+    let expected: String = [
+        "For want of a nail the shoe was lost.",
+        "And all for the want of a nail.",
+    ]
+    .join("\n");
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn three_pieces() {
+    let input = &["nail", "shoe", "horse"];
+    let output = build_proverb(input);
+    let expected: String = [
+        "For want of a nail the shoe was lost.",
+        "For want of a shoe the horse was lost.",
+        "And all for the want of a nail.",
+    ]
+    .join("\n");
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn full_proverb() {
+    let input = &[
+        "nail", "shoe", "horse", "rider", "message", "battle", "kingdom",
+    ];
+    let output = build_proverb(input);
+    let expected: String = [
+        "For want of a nail the shoe was lost.",
+        "For want of a shoe the horse was lost.",
+        "For want of a horse the rider was lost.",
+        "For want of a rider the message was lost.",
+        "For want of a message the battle was lost.",
+        "For want of a battle the kingdom was lost.",
+        "And all for the want of a nail.",
+    ]
+    .join("\n");
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn four_pieces_modernized() {
+    let input = &["pin", "gun", "soldier", "battle"];
+    let output = build_proverb(input);
+    let expected: String = [
+        "For want of a pin the gun was lost.",
+        "For want of a gun the soldier was lost.",
+        "For want of a soldier the battle was lost.",
+        "And all for the want of a pin.",
+    ]
+    .join("\n");
+    assert_eq!(output, expected);
+}