feat: add mvp language server (#8515)

Resolves #8400

1 files changed, 88 insertions, 0 deletions

diff --git a/cli/tests/lsp_tests.rs b/cli/tests/lsp_tests.rs
new file mode 100644
index 000000000..7de655ac8
--- /dev/null
+++ b/cli/tests/lsp_tests.rs
@@ -0,0 +1,88 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+///!
+///! Integration test for the Deno Language Server (`deno lsp`)
+///!
+use std::fs;
+use std::io::Read;
+use std::io::Write;
+use std::process::Stdio;
+
+struct LspIntegrationTest {
+  pub fixtures: Vec<&'static str>,
+}
+
+impl LspIntegrationTest {
+  pub fn run(&self) -> (String, String) {
+    let root_path = test_util::root_path();
+    let deno_exe = test_util::deno_exe_path();
+    let tests_dir = root_path.join("cli/tests/lsp");
+    println!("tests_dir: {:?} deno_exe: {:?}", tests_dir, deno_exe);
+    let mut command = test_util::deno_cmd();
+    command
+      .arg("lsp")
+      .stdin(Stdio::piped())
+      .stdout(Stdio::piped())
+      .stderr(Stdio::piped());
+
+    let process = command.spawn().expect("failed to execute deno");
+
+    for fixture in &self.fixtures {
+      let mut stdin = process.stdin.as_ref().unwrap();
+      let fixture_path = tests_dir.join(fixture);
+      let content =
+        fs::read_to_string(&fixture_path).expect("could not read fixture");
+      let content_length = content.chars().count();
+      write!(
+        stdin,
+        "Content-Length: {}\r\n\r\n{}",
+        content_length, content
+      )
+      .unwrap();
+    }
+
+    let mut so = String::new();
+    process.stdout.unwrap().read_to_string(&mut so).unwrap();
+
+    let mut se = String::new();
+    process.stderr.unwrap().read_to_string(&mut se).unwrap();
+
+    (so, se)
+  }
+}
+
+#[test]
+fn test_lsp_startup_shutdown() {
+  let test = LspIntegrationTest {
+    fixtures: vec![
+      "initialize_request.json",
+      "initialized_notification.json",
+      "shutdown_request.json",
+      "exit_notification.json",
+    ],
+  };
+  let (response, out) = test.run();
+  assert!(response.contains("deno-language-server"));
+  assert!(out.contains("Connected to \"test-harness\" 1.0.0"));
+}
+
+#[test]
+fn test_lsp_hover() {
+  // a straight forward integration tests starts up the lsp, opens a document
+  // which logs `Deno.args` to the console, and hovers over the `args` property
+  // to get the intellisense about it, which is a total end-to-end test that
+  // includes sending information in and out of the TypeScript compiler.
+  let test = LspIntegrationTest {
+    fixtures: vec![
+      "initialize_request.json",
+      "initialized_notification.json",
+      "did_open_notification.json",
+      "hover_request.json",
+      "shutdown_request.json",
+      "exit_notification.json",
+    ],
+  };
+  let (response, out) = test.run();
+  assert!(response.contains("const Deno.args: string[]"));
+  assert!(out.contains("Connected to \"test-harness\" 1.0.0"));
+}