Add simple integration tests

Cargo.lock

@@ -4,192 +4,257 @@
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Cargo.toml

@@ -22,6 +22,9 @@ version = "2"
 default-features = false
 features = ["suggestions", "color", "wrap_help"]
 
+[dev-dependencies]
+assert_cmd = "1.0.1"
+
 [profile.release]
 lto = true
 codegen-units = 1

tests/examples/ascii

@@ -0,0 +1 @@
+abcdefgh!?%&/()

tests/integration_tests.rs

@@ -0,0 +1,41 @@
+use assert_cmd::Command;
+
+fn hexyl() -> Command {
+    let mut cmd = Command::cargo_bin("hexyl").unwrap();
+    cmd.current_dir("tests/examples");
+    cmd
+}
+
+#[test]
+fn can_print_simple_ascii_file() {
+    hexyl()
+        .arg("ascii")
+        .arg("--color=never")
+        .assert()
+        .success()
+        .stdout(
+            "┌────────┬─────────────────────────┬─────────────────────────┬────────┬────────┐\n\
+             │00000000│ 61 62 63 64 65 66 67 68 ┊ 21 3f 25 26 2f 28 29 0a │abcdefgh┊!?%&/()_│\n\
+             └────────┴─────────────────────────┴─────────────────────────┴────────┴────────┘\n",
+        );
+}
+
+#[test]
+fn fails_on_non_existing_input() {
+    hexyl().arg("non-existing").assert().failure();
+}
+
+#[test]
+fn display_offset() {
+    hexyl()
+        .arg("ascii")
+        .arg("--color=never")
+        .arg("--display-offset=0xc0ffee")
+        .assert()
+        .success()
+        .stdout(
+            "┌────────┬─────────────────────────┬─────────────────────────┬────────┬────────┐\n\
+             │00c0ffee│ 61 62 63 64 65 66 67 68 ┊ 21 3f 25 26 2f 28 29 0a │abcdefgh┊!?%&/()_│\n\
+             └────────┴─────────────────────────┴─────────────────────────┴────────┴────────┘\n",
+        );
+}