tests(cli): add basic integration tests for the CLI

cli/Cargo.toml

@@ -26,3 +26,7 @@ termcolor = { version = "1.4.1" }
 is-terminal = { version = "0.4.13" }
 comfy-table = "7.1.1"
 anyhow = "1.0.91"
+
+[dev-dependencies]
+assert_cmd = "2.0.16"
+predicates = "3.1.2"

cli/tests/cli.rs

@@ -0,0 +1,117 @@
+use assert_cmd::Command;
+use predicates::{
+    prelude::PredicateBooleanExt,
+    str::{contains, ends_with, is_match, starts_with},
+};
+
+fn get_cmd() -> Command {
+    let mut cmd = Command::cargo_bin("frs").unwrap();
+    cmd.arg("--url=http://localhost:8080");
+    cmd
+}
+
+#[test]
+fn test_currencies_basic() {
+    get_cmd()
+        .arg("currencies")
+        .assert()
+        .stdout(
+            contains("AUD")
+                .and(contains("USD"))
+                .and(contains("GBP"))
+                .and(contains("United States Dollar"))
+                .and(is_match("\\d").unwrap().not()),
+        )
+        .success();
+}
+
+#[test]
+fn test_currencies_json() {
+    get_cmd()
+        .arg("currencies")
+        .arg("--json")
+        .assert()
+        .stdout(
+            starts_with("{")
+                .and(ends_with("}\n"))
+                .and(contains("\"EUR\": \"Euro\"")),
+        )
+        .success();
+}
+
+#[test]
+fn test_currencies_raw() {
+    get_cmd()
+        .arg("currencies")
+        .arg("--raw")
+        .assert()
+        .stdout(starts_with("AUD\tAustralian Dollar").and(contains("EUR\tEuro")))
+        .success();
+}
+
+#[test]
+fn test_convert_basic() {
+    get_cmd()
+        .arg("convert")
+        .assert()
+        .stdout(
+            contains("AUD")
+                .and(contains("USD"))
+                .and(contains("GBP"))
+                .and(is_match("\\d").unwrap()),
+        )
+        .success();
+}
+
+#[test]
+fn test_convert_targets() {
+    get_cmd()
+        .args(["convert", "USD", "EUR,GBP"])
+        .assert()
+        .stdout(
+            contains("EUR")
+                .and(contains("GBP"))
+                .and(is_match("\\d").unwrap())
+                .and(contains("USD").not()),
+        )
+        .success();
+}
+
+#[test]
+fn test_convert_amount() {
+    get_cmd()
+        .args(["convert", "-a", "1000", "--json"])
+        .assert()
+        .stdout(contains("1000").and(is_match("\\d").unwrap()))
+        .success();
+}
+
+#[test]
+fn test_period_basic() {
+    get_cmd()
+        .args(["period", "EUR", "2024-10-10"])
+        .assert()
+        .stdout(
+            contains("2024-10-10")
+                .and(contains("2024-10-11"))
+                .and(contains("2024-11-05"))
+                .and(contains("AUD"))
+                .and(contains("USD"))
+                .and(contains("GBP")),
+        )
+        .success();
+}
+
+#[test]
+fn test_period_end_date() {
+    get_cmd()
+        .args(["period", "EUR", "2020-5-12", "2020-5-13"])
+        .assert()
+        .stdout(
+            contains("2020-05-12")
+                .and(contains("2020-05-13"))
+                .and(contains("2024-05-11").not())
+                .and(contains("2024-05-14").not()),
+        )
+        .success();
+}