test(nodejs): Port nodejs module tests from E2E to integraton (#867)

Replaces the existing nodejs module end-to-end tests with integration tests that don't require preinstalled environmental dependencies.

- Moved the tests to the same file as the module they test
- Created a render_module utility function for rendering modules within tests
- Removed Node.js installation during CI setup
- Add Shell to Context to allow for tests to not run shell-specific code

14 files changed, 136 insertions, 142 deletions

diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index c4900c6b8..ac281d0b1 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -133,11 +133,6 @@ jobs:
           ARGS: --resolver nightly-2019-09-21
         run: stack $ARGS ghc -- --numeric-version --no-install-ghc
 
-      # Install Node.js at a fixed version
-      - uses: actions/setup-node@v1
-        with:
-          node-version: "12.0.0"
-
       # Install Golang at a fixed version
       - uses: actions/setup-go@v1
         with:
diff --git a/src/context.rs b/src/context.rs
index ead8e1e79..460ede159 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -31,6 +31,9 @@ pub struct Context<'a> {
 
     /// Private field to store Git information for modules who need it
     repo: OnceCell<Repo>,
+
+    /// The shell the user is assumed to be running
+    pub shell: Shell,
 }
 
 impl<'a> Context<'a> {
@@ -71,12 +74,15 @@ impl<'a> Context<'a> {
         // TODO: Currently gets the physical directory. Get the logical directory.
         let current_dir = Context::expand_tilde(dir.into());
 
+        let shell = Context::get_shell();
+
         Context {
             config,
             properties,
             current_dir,
             dir_files: OnceCell::new(),
             repo: OnceCell::new(),
+            shell,
         }
     }
 
@@ -160,6 +166,18 @@ impl<'a> Context<'a> {
                 Ok(dir_files)
             })
     }
+
+    fn get_shell() -> Shell {
+        let shell = std::env::var("STARSHIP_SHELL").unwrap_or_default();
+        match shell.as_str() {
+            "bash" => Shell::Bash,
+            "fish" => Shell::Fish,
+            "ion" => Shell::Ion,
+            "powershell" => Shell::PowerShell,
+            "zsh" => Shell::Zsh,
+            _ => Shell::Unknown,
+        }
+    }
 }
 
 pub struct Repo {
@@ -252,6 +270,16 @@ fn get_current_branch(repository: &Repository) -> Option<String> {
     shorthand.map(std::string::ToString::to_string)
 }
 
+#[derive(Debug, Clone)]
+pub enum Shell {
+    Bash,
+    Fish,
+    Ion,
+    PowerShell,
+    Zsh,
+    Unknown,
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/src/module.rs b/src/module.rs
index 34f3a6520..f09c6e5df 100644
--- a/src/module.rs
+++ b/src/module.rs
@@ -1,4 +1,5 @@
 use crate::config::SegmentConfig;
+use crate::context::Shell;
 use crate::segment::Segment;
 use ansi_term::Style;
 use ansi_term::{ANSIString, ANSIStrings};
@@ -134,10 +135,10 @@ impl<'a> Module<'a> {
     /// Returns a vector of colored ANSIString elements to be later used with
     /// `ANSIStrings()` to optimize ANSI codes
     pub fn ansi_strings(&self) -> Vec<ANSIString> {
-        self.ansi_strings_for_prompt(true)
+        self.ansi_strings_for_shell(Shell::Unknown)
     }
 
-    pub fn ansi_strings_for_prompt(&self, is_prompt: bool) -> Vec<ANSIString> {
+    pub fn ansi_strings_for_shell(&self, shell: Shell) -> Vec<ANSIString> {
         let mut ansi_strings = self
             .segments
             .iter()
@@ -147,20 +148,17 @@ impl<'a> Module<'a> {
         ansi_strings.insert(0, self.prefix.ansi_string());
         ansi_strings.push(self.suffix.ansi_string());
 
-        if is_prompt {
-            let shell = std::env::var("STARSHIP_SHELL").unwrap_or_default();
-            ansi_strings = match shell.as_str() {
-                "bash" => ansi_strings_modified(ansi_strings, shell),
-                "zsh" => ansi_strings_modified(ansi_strings, shell),
-                _ => ansi_strings,
-            };
-        }
+        ansi_strings = match shell {
+            Shell::Bash => ansi_strings_modified(ansi_strings, shell),
+            Shell::Zsh => ansi_strings_modified(ansi_strings, shell),
+            _ => ansi_strings,
+        };
 
         ansi_strings
     }
 
-    pub fn to_string_without_prefix(&self) -> String {
-        ANSIStrings(&self.ansi_strings()[1..]).to_string()
+    pub fn to_string_without_prefix(&self, shell: Shell) -> String {
+        ANSIStrings(&self.ansi_strings_for_shell(shell)[1..]).to_string()
     }
 }
 
@@ -174,7 +172,7 @@ impl<'a> fmt::Display for Module<'a> {
 /// Many shells cannot deal with raw unprintable characters (like ANSI escape sequences) and
 /// miscompute the cursor position as a result, leading to strange visual bugs. Here, we wrap these
 /// characters in shell-specific escape codes to indicate to the shell that they are zero-length.
-fn ansi_strings_modified(ansi_strings: Vec<ANSIString>, shell: String) -> Vec<ANSIString> {
+fn ansi_strings_modified(ansi_strings: Vec<ANSIString>, shell: Shell) -> Vec<ANSIString> {
     const ESCAPE_BEGIN: char = '\u{1b}';
     const MAYBE_ESCAPE_END: char = 'm';
     ansi_strings
@@ -187,18 +185,18 @@ fn ansi_strings_modified(ansi_strings: Vec<ANSIString>, shell: String) -> Vec<AN
                 .map(|x| match x {
                     ESCAPE_BEGIN => {
                         escaped = true;
-                        match shell.as_str() {
-                            "bash" => String::from("\u{5c}\u{5b}\u{1b}"), // => \[ESC
-                            "zsh" => String::from("\u{25}\u{7b}\u{1b}"),  // => %{ESC
+                        match shell {
+                            Shell::Bash => String::from("\u{5c}\u{5b}\u{1b}"), // => \[ESC
+                            Shell::Zsh => String::from("\u{25}\u{7b}\u{1b}"),  // => %{ESC
                             _ => x.to_string(),
                         }
                     }
                     MAYBE_ESCAPE_END => {
                         if escaped {
                             escaped = false;
-                            match shell.as_str() {
-                                "bash" => String::from("m\u{5c}\u{5d}"), // => m\]
-                                "zsh" => String::from("m\u{25}\u{7d}"),  // => m%}
+                            match shell {
+                                Shell::Bash => String::from("m\u{5c}\u{5d}"), // => m\]
+                                Shell::Zsh => String::from("m\u{25}\u{7d}"),  // => m%}
                                 _ => x.to_string(),
                             }
                         } else {
diff --git a/src/modules/battery.rs b/src/modules/battery.rs
index 8c651a954..55e248e57 100644
--- a/src/modules/battery.rs
+++ b/src/modules/battery.rs
@@ -1,13 +1,12 @@
-use super::{Context, Module, RootModuleConfig};
+use super::{Context, Module, RootModuleConfig, Shell};
 use crate::configs::battery::BatteryConfig;
 
 /// Creates a module for the battery percentage and charging state
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     // TODO: Update when v1.0 printing refactor is implemented to only
     // print escapes in a prompt context.
-    let shell = std::env::var("STARSHIP_SHELL").unwrap_or_default();
-    let percentage_char = match shell.as_str() {
-        "zsh" => "%%", // % is an escape in zsh, see PROMPT in `man zshmisc`
+    let percentage_char = match context.shell {
+        Shell::Zsh => "%%", // % is an escape in zsh, see PROMPT in `man zshmisc`
         _ => "%",
     };
 
diff --git a/src/modules/character.rs b/src/modules/character.rs
index cc9545172..e0c0ffe9e 100644
--- a/src/modules/character.rs
+++ b/src/modules/character.rs
@@ -1,5 +1,4 @@
-use super::{Context, Module, RootModuleConfig};
-
+use super::{Context, Module, RootModuleConfig, Shell};
 use crate::configs::character::CharacterConfig;
 
 /// Creates a module for the prompt character
@@ -25,7 +24,6 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let props = &context.properties;
     let exit_code_default = std::string::String::from("0");
     let exit_code = props.get("status_code").unwrap_or(&exit_code_default);
-    let shell = std::env::var("STARSHIP_SHELL").unwrap_or_default();
     let keymap_default = std::string::String::from("viins");
     let keymap = props.get("keymap").unwrap_or(&keymap_default);
     let exit_success = exit_code == "0";
@@ -35,8 +33,8 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     // Unfortunately, this is also the name of the non-vi default mode.
     // We do some environment detection in src/init.rs to translate.
     // The result: in non-vi fish, keymap is always reported as "insert"
-    let mode = match (shell.as_str(), keymap.as_str()) {
-        ("fish", "default") | ("zsh", "vicmd") => ShellEditMode::Normal,
+    let mode = match (&context.shell, keymap.as_str()) {
+        (Shell::Fish, "default") | (Shell::Zsh, "vicmd") => ShellEditMode::Normal,
         _ => ASSUMED_MODE,
     };
 
diff --git a/src/modules/memory_usage.rs b/src/modules/memory_usage.rs
index 5a160ee48..c7d224339 100644
--- a/src/modules/memory_usage.rs
+++ b/src/modules/memory_usage.rs
@@ -1,7 +1,7 @@
 use byte_unit::{Byte, ByteUnit};
 use sysinfo::{RefreshKind, SystemExt};
 
-use super::{Context, Module, RootModuleConfig};
+use super::{Context, Module, RootModuleConfig, Shell};
 
 use crate::configs::memory_usage::MemoryConfig;
 
@@ -19,9 +19,8 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
 
     // TODO: Update when v1.0 printing refactor is implemented to only
     // print escapes in a prompt context.
-    let shell = std::env::var("STARSHIP_SHELL").unwrap_or_default();
-    let percent_sign = match shell.as_str() {
-        "zsh" => "%%", // % is an escape in zsh, see PROMPT in `man zshmisc`
+    let percent_sign = match context.shell {
+        Shell::Zsh => "%%", // % is an escape in zsh, see PROMPT in `man zshmisc`
         _ => "%",
     };
 
diff --git a/src/modules/mod.rs b/src/modules/mod.rs
index 9c9f403c0..74b11b946 100644
--- a/src/modules/mod.rs
+++ b/src/modules/mod.rs
@@ -35,7 +35,7 @@ mod utils;
 mod battery;
 
 use crate::config::{RootModuleConfig, SegmentConfig};
-use crate::context::Context;
+use crate::context::{Context, Shell};
 use crate::module::Module;
 
 pub fn handle<'a>(module: &str, context: &'a Context) -> Option<Module<'a>> {
diff --git a/src/modules/nodejs.rs b/src/modules/nodejs.rs
index 5bd314354..7fec383fa 100644
--- a/src/modules/nodejs.rs
+++ b/src/modules/nodejs.rs
@@ -34,3 +34,55 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
 
     Some(module)
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::modules::utils::test::render_module;
+    use ansi_term::Color;
+    use std::fs::{self, File};
+    use std::io;
+    use tempfile;
+
+    #[test]
+    fn folder_without_node_files() -> io::Result<()> {
+        let dir = tempfile::tempdir()?;
+        let actual = render_module("nodejs", dir.path());
+        let expected = None;
+        assert_eq!(expected, actual);
+        Ok(())
+    }
+
+    #[test]
+    fn folder_with_package_json() -> io::Result<()> {
+        let dir = tempfile::tempdir()?;
+        File::create(dir.path().join("package.json"))?.sync_all()?;
+
+        let actual = render_module("nodejs", dir.path());
+        let expected = Some(format!("via {} ", Color::Green.bold().paint("⬢ v12.0.0")));
+        assert_eq!(expected, actual);
+        Ok(())
+    }
+
+    #[test]
+    fn folder_with_js_file() -> io::Result<()> {
+        let dir = tempfile::tempdir()?;
+        File::create(dir.path().join("index.js"))?.sync_all()?;
+
+        let actual = render_module("nodejs", dir.path());
+        let expected = Some(format!("via {} ", Color::Green.bold().paint("⬢ v12.0.0")));
+        assert_eq!(expected, actual);
+        Ok(())
+    }
+
+    #[test]
+    fn folder_with_node_modules() -> io::Result<()> {
+        let dir = tempfile::tempdir()?;
+        let node_modules = dir.path().join("node_modules");
+        fs::create_dir_all(&node_modules)?;
+
+        let actual = render_module("nodejs", dir.path());
+        let expected = Some(format!("via {} ", Color::Green.bold().paint("⬢ v12.0.0")));
+        assert_eq!(expected, actual);
+        Ok(())
+    }
+}
diff --git a/src/modules/utils/mod.rs b/src/modules/utils/mod.rs
index 6838fb19e..345ce7f40 100644
--- a/src/modules/utils/mod.rs
+++ b/src/modules/utils/mod.rs
@@ -1,2 +1,5 @@
 pub mod directory;
 pub mod java_version_parser;
+
+#[cfg(test)]
+pub mod test;
diff --git a/src/modules/utils/test.rs b/src/modules/utils/test.rs
new file mode 100644
index 000000000..b3c106b30
--- /dev/null
+++ b/src/modules/utils/test.rs
@@ -0,0 +1,12 @@
+use crate::config::StarshipConfig;
+use crate::context::{Context, Shell};
+use std::path::Path;
+
+/// Render a specific starship module by name
+pub fn render_module(module_name: &str, path: &Path) -> Option<String> {
+    let mut context = Context::new_with_dir(clap::ArgMatches::default(), path);
+    context.config = StarshipConfig { config: None };
+    context.shell = Shell::Unknown;
+
+    crate::print::get_module(module_name, context)
+}
diff --git a/src/print.rs b/src/print.rs
index ee3b36662..46d44d223 100644
--- a/src/print.rs
+++ b/src/print.rs
@@ -1,3 +1,4 @@
+use ansi_term::ANSIStrings;
 use clap::ArgMatches;
 use rayon::prelude::*;
 use std::fmt::Write as FmtWrite;
@@ -35,10 +36,11 @@ pub fn get_prompt(context: Context) -> String {
     for module in printable {
         // Skip printing the prefix of a module after the line_break
         if print_without_prefix {
-            let module_without_prefix = module.to_string_without_prefix();
+            let module_without_prefix = module.to_string_without_prefix(context.shell.clone());
             write!(buf, "{}", module_without_prefix).unwrap()
         } else {
-            write!(buf, "{}", module).unwrap();
+            let module = module.ansi_strings_for_shell(context.shell.clone());
+            write!(buf, "{}", ANSIStrings(&module)).unwrap();
         }
 
         print_without_prefix = module.get_name() == "line_break"
@@ -49,15 +51,14 @@ pub fn get_prompt(context: Context) -> String {
 
 pub fn module(module_name: &str, args: ArgMatches) {
     let context = Context::new(args);
-
-    // If the module returns `None`, print an empty string
-    let module = modules::handle(module_name, &context)
-        .map(|m| m.to_string())
-        .unwrap_or_default();
-
+    let module = get_module(module_name, context).unwrap_or_default();
     print!("{}", module);
 }
 
+pub fn get_module(module_name: &str, context: Context) -> Option<String> {
+    modules::handle(module_name, &context).map(|m| m.to_string())
+}
+
 pub fn explain(args: ArgMatches) {
     let context = Context::new(args);
 
@@ -73,7 +74,7 @@ pub fn explain(args: ArgMatches) {
         .into_iter()
         .filter(|module| !dont_print.contains(&module.get_name().as_str()))
         .map(|module| {
-            let ansi_strings = module.ansi_strings_for_prompt(false);
+            let ansi_strings = module.ansi_strings();
             let value = module.get_segments().join("");
             ModuleInfo {
                 value: ansi_term::ANSIStrings(&ansi_strings[1..ansi_strings.len() - 1]).to_string(),
diff --git a/src/utils.rs b/src/utils.rs
index e4a4e7d38..758aededc 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -36,8 +36,11 @@ pub fn exec_cmd(cmd: &str, args: &[&str]) -> Option<CommandOutput> {
         0 => String::from(cmd),
         _ => format!("{} {}", cmd, args.join(" ")),
     };
-
     match command.as_str() {
+        "node --version" => Some(CommandOutput {
+            stdout: String::from("v12.0.0"),
+            stderr: String::default(),
+        }),
         "dummy_command" => Some(CommandOutput {
             stdout: String::from("stdout ok!"),
             stderr: String::from("stderr ok!"),
diff --git a/tests/testsuite/main.rs b/tests/testsuite/main.rs
index b7cce9435..f12b60780 100644
--- a/tests/testsuite/main.rs
+++ b/tests/testsuite/main.rs
@@ -19,7 +19,6 @@ mod jobs;
 mod line_break;
 mod modules;
 mod nix_shell;
-mod nodejs;
 mod python;
 mod ruby;
 mod terraform;
diff --git a/tests/testsuite/nodejs.rs b/tests/testsuite/nodejs.rs
deleted file mode 100644
index c0df62a7e..000000000
--- a/tests/testsuite/nodejs.rs
+++ /dev/null
@@ -1,93 +0,0 @@
-use ansi_term::Color;
-use std::fs::{self, File};
-use std::io;
-use tempfile;
-
-use crate::common;
-
-/// Wrapper around common::render_module("nodejs") to work around platform quirks
-fn render_node_module() -> std::process::Command {
-    let mut command = common::render_module("nodejs");
-
-    // If SYSTEMROOT is not set on Windows node will refuse to print its version
-    if cfg!(windows) {
-        let system_root = std::env::var("SYSTEMROOT")
-            .map(|i| {
-                if i.trim().is_empty() {
-                    "C:\\WINDOWS".into()
-                } else {
-                    i
-                }
-            })
-            .unwrap_or_else(|_| "C:\\WINDOWS".into());
-        command.env("SYSTEMROOT", system_root);
-    }
-    command
-}
-
-#[test]
-fn folder_without_node_files() -> io::Result<()> {
-    let dir = tempfile::tempdir()?;
-
-    let output = render_node_module()
-        .arg("--path")
-        .arg(dir.path())
-        .output()?;
-    let actual = String::from_utf8(output.stdout).unwrap();
-
-    let expected = "";
-    assert_eq!(expected, actual);
-    Ok(())
-}
-
-#[test]
-#[ignore]
-fn folder_with_package_json() -> io::Result<()> {
-    let dir = tempfile::tempdir()?;
-    File::create(dir.path().join("package.json"))?.sync_all()?;
-
-    let output = render_node_module()
-        .arg("--path")
-        .arg(dir.path())
-        .output()?;
-    let actual = String::from_utf8(output.stdout).unwrap();
-
-    let expected = format!("via {} ", Color::Green.bold().paint("⬢ v12.0.0"));
-    assert_eq!(expected, actual);
-    Ok(())
-}
-
-#[test]
-#[ignore]
-fn folder_with_js_file() -> io::Result<()> {
-    let dir = tempfile::tempdir()?;
-    File::create(dir.path().join("index.js"))?.sync_all()?;
-
-    let output = render_node_module()
-        .arg("--path")
-        .arg(dir.path())
-        .output()?;
-    let actual = String::from_utf8(output.stdout).unwrap();
-
-    let expected = format!("via {} ", Color::Green.bold().paint("⬢ v12.0.0"));
-    assert_eq!(expected, actual);
-    Ok(())
-}
-
-#[test]
-#[ignore]
-fn folder_with_node_modules() -> io::Result<()> {
-    let dir = tempfile::tempdir()?;
-    let node_modules = dir.path().join("node_modules");
-    fs::create_dir_all(&node_modules)?;
-
-    let output = render_node_module()
-        .arg("--path")
-        .arg(dir.path())
-        .output()?;
-    let actual = String::from_utf8(output.stdout).unwrap();
-
-    let expected = format!("via {} ", Color::Green.bold().paint("⬢ v12.0.0"));
-    assert_eq!(expected, actual);
-    Ok(())
-}