1 files changed, 137 insertions, 0 deletions
diff --git a/crates/cli/tests/cli.rs b/crates/cli/tests/cli.rs
new file mode 100644
index 0000000..b7d303e
--- /dev/null
+++ b/crates/cli/tests/cli.rs
@@ -0,0 +1,137 @@
+use std::fs;
+
+use assert_cmd::Command;
+use predicates::prelude::*;
+use tempfile::tempdir;
+
+fn write_module(dir: &tempfile::TempDir, name: &str, source: &str) -> String {
+    let path = dir.path().join(name);
+    fs::write(&path, source).unwrap();
+    path.to_string_lossy().into_owned()
+}
+
+#[test]
+fn run_invoke_accepts_positional_args() {
+    let dir = tempdir().unwrap();
+    let module = write_module(
+        &dir,
+        "add.wat",
+        r#"(module
+            (func (export "add") (param i32 i32) (result i32)
+                local.get 0
+                local.get 1
+                i32.add))"#,
+    );
+
+    Command::cargo_bin("tinywasm")
+        .unwrap()
+        .args(["run", "--invoke", "add", &module, "1", "2"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("i32(3)"));
+}
+
+#[test]
+fn compile_and_run_twasm() {
+    let dir = tempdir().unwrap();
+    let input = write_module(
+        &dir,
+        "add.wat",
+        r#"(module
+            (func (export "add") (param i32 i32) (result i32)
+                local.get 0
+                local.get 1
+                i32.add))"#,
+    );
+    let output = dir.path().join("add.twasm");
+
+    Command::cargo_bin("tinywasm")
+        .unwrap()
+        .args(["compile", &input, "-o", output.to_str().unwrap()])
+        .assert()
+        .success();
+
+    Command::cargo_bin("tinywasm")
+        .unwrap()
+        .args(["run", "--invoke", "add", output.to_str().unwrap(), "3", "4"])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("i32(7)"));
+}
+
+#[test]
+fn bare_run_requires_default_entrypoint() {
+    let dir = tempdir().unwrap();
+    let module = write_module(&dir, "add.wat", r#"(module (func (export "add") (result i32) i32.const 1))"#);
+
+    Command::cargo_bin("tinywasm")
+        .unwrap()
+        .arg(&module)
+        .assert()
+        .failure()
+        .stderr(predicate::str::contains("no start function or `_start` export"));
+}
+
+#[test]
+fn inspect_lists_exports() {
+    let dir = tempdir().unwrap();
+    let module = write_module(
+        &dir,
+        "inspect.wat",
+        r#"(module
+            (memory (export "memory") 1)
+            (func (export "answer") (result i32) i32.const 42))"#,
+    );
+
+    Command::cargo_bin("tinywasm").unwrap().args(["inspect", &module]).assert().success().stdout(
+        predicate::str::contains("answer: func () -> (i32)").and(predicate::str::contains("memory: memory[i32]")),
+    );
+}
+
+#[test]
+fn dump_prints_lowered_instructions() {
+    let dir = tempdir().unwrap();
+    let module = write_module(&dir, "dump.wat", r#"(module (func (export "noop")))"#);
+
+    Command::cargo_bin("tinywasm")
+        .unwrap()
+        .args(["dump", &module])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("func[0]").and(predicate::str::contains("0000:")));
+}
+
+#[test]
+fn run_accepts_wat_from_stdin() {
+    Command::cargo_bin("tinywasm")
+        .unwrap()
+        .args(["run", "--invoke", "add", "-", "8", "9"])
+        .write_stdin(
+            r#"(module
+                (func (export "add") (param i32 i32) (result i32)
+                    local.get 0
+                    local.get 1
+                    i32.add))"#,
+        )
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("i32(17)"));
+}
+
+#[test]
+fn wast_command_runs_simple_spec_script() {
+    let dir = tempdir().unwrap();
+    let path = dir.path().join("simple.wast");
+    fs::write(
+        &path,
+        "(module (func (export \"add\") (result i32) i32.const 1))\n(assert_return (invoke \"add\") (i32.const 1))",
+    )
+    .unwrap();
+
+    Command::cargo_bin("tinywasm")
+        .unwrap()
+        .args(["wast", path.to_str().unwrap()])
+        .assert()
+        .success()
+        .stdout(predicate::str::contains("Tests Passed:"));
+}