Use arguments to test foreground and background colors

Sources/TerminalUI/Color.swift

@@ -1,5 +1,5 @@
 
-public struct Color: Equatable {
+public struct Color: Equatable, Sendable {
   let foreground: ControlSequence
   let background: ControlSequence
 }

Sources/TerminalUI/Internal/ControlSequence.swift

@@ -1,5 +1,5 @@
 
-struct ControlSequence: Equatable {
+struct ControlSequence: Equatable, Sendable {
   fileprivate let raw: String
   fileprivate init(_ raw: String) {
     self.raw = raw

Tests/TerminalUITests/ViewModifiers/BackgroundColor.swift

@@ -1,18 +1,44 @@
-@testable import TerminalUI
+import TerminalUI
 import TerminalUITesting
 import Testing
 
 @Suite("BackgroundColor", .tags(.viewModifier))
 struct BackgroundColorTests {
 
-  @Test("backgroundColor")
-  func backgroundColor() {
+  @Test("Text Output", arguments: [
+    (Color.`default`, "[49m"),
+    (Color.black, "[40m"),
+    (Color.red, "[41m"),
+    (Color.green, "[42m"),
+    (Color.yellow, "[43m"),
+    (Color.blue, "[44m"),
+    (Color.magenta, "[45m"),
+    (Color.cyan, "[46m"),
+    (Color.white, "[47m"),
+  ])
+  func textOutput(backgroundColor: Color, expected: String) {
 
-    let text = Text("x")
-      .backgroundColor(.blue)
+    let app = TestApp {
+      Text("a").backgroundColor(backgroundColor)
+    }
 
-    text.expect([
-      Position(x: 1, y: 0): Pixel("x", background: .blue),
+    let stream = TestStream()
+    app.run(stream: stream)
+
+    #expect(stream.controlSequences == [
+      "[2J",     // Clear screen
+      "[?1049h", // Alternative buffer on
+      "[?25l",   // Cursor visibility off
+      "[39m",    // ForegroundColor default
+      expected,  // BackgroundColor
+      "[22m",    // Bold off
+      "[23m",    // Italic off
+      "[24m",    // Underline off
+      "[25m",    // Blinking off
+      "[27m",    // Inverse off
+      "[28m",    // Hidden off
+      "[29m",    // Strikethrough off
+      "[0;1Ha",  // Position + content
     ])
   }
 }

Tests/TerminalUITests/ViewModifiers/ForegroundColorTests.swift

@@ -1,18 +1,44 @@
-@testable import TerminalUI
+import TerminalUI
 import TerminalUITesting
 import Testing
 
 @Suite("ForegroundColor", .tags(.viewModifier))
 struct ForegroundColorTests {
 
-  @Test("foregroundColor")
-  func foregroundColor() {
+  @Test("Text Output", arguments: [
+    (Color.`default`, "[39m"),
+    (Color.black, "[30m"),
+    (Color.red, "[31m"),
+    (Color.green, "[32m"),
+    (Color.yellow, "[33m"),
+    (Color.blue, "[34m"),
+    (Color.magenta, "[35m"),
+    (Color.cyan, "[36m"),
+    (Color.white, "[37m"),
+  ])
+  func textOutput(foregroundColor: Color, expected: String) {
 
-    let text = Text("x")
-      .foregroundColor(.blue)
+    let app = TestApp {
+      Text("a").foregroundColor(foregroundColor)
+    }
 
-    text.expect([
-      Position(x: 1, y: 0): Pixel("x", foreground: .blue),
+    let stream = TestStream()
+    app.run(stream: stream)
+
+    #expect(stream.controlSequences == [
+      "[2J",     // Clear screen
+      "[?1049h", // Alternative buffer on
+      "[?25l",   // Cursor visibility off
+      expected,  // ForegroundColor
+      "[49m",    // BackgroundColor default
+      "[22m",    // Bold off
+      "[23m",    // Italic off
+      "[24m",    // Underline off
+      "[25m",    // Blinking off
+      "[27m",    // Inverse off
+      "[28m",    // Hidden off
+      "[29m",    // Strikethrough off
+      "[0;1Ha",  // Position + content
     ])
   }
 }