From fed4902cdb155bd0efb0295a071f3fa6fa16de96 Mon Sep 17 00:00:00 2001
From: Aurelius Prochazka <aure@aure.com>
Date: Thu, 11 Apr 2024 10:51:16 -0700
Subject: [PATCH] Added 7sus2, a little cleanup on 7sus4

---
 Sources/Tonic/ChordType.swift     | 14 ++++++++++----
 Tests/TonicTests/ChordTests.swift | 11 +++++++++--
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/Sources/Tonic/ChordType.swift b/Sources/Tonic/ChordType.swift
index a6bfee1..e307843 100644
--- a/Sources/Tonic/ChordType.swift
+++ b/Sources/Tonic/ChordType.swift
@@ -42,7 +42,10 @@ public enum ChordType: String, CaseIterable, Codable {
     case dominantSeventh
 
     /// Dominant Seventh Suspendend Fourth: Perfect Fourth, Perfect Fifth, Minor Seventh
-    case dominantSeventhSus4
+    case dominantSeventhSuspendedFourth
+
+    /// Dominant Seventh Suspendend Second: Major Second, Perfect Fifth, Minor Seventh
+    case dominantSeventhSuspendedSecond
 
     /// Major Seventh: Major Third, Perfect Fifth, Major Seventh
     case majorSeventh
@@ -154,7 +157,8 @@ public enum ChordType: String, CaseIterable, Codable {
         case .halfDiminishedSeventh:            return [.m3, .d5, .m7]
         case .diminishedSeventh:                return [.m3, .d5, .d7]
         case .dominantSeventh:                  return [.M3, .P5, .m7]
-        case .dominantSeventhSus4:              return [.P4, .P5, .m7]
+        case .dominantSeventhSuspendedFourth:   return [.P4, .P5, .m7]
+        case .dominantSeventhSuspendedSecond:   return [.M2, .P5, .m7]
         case .majorSeventh:                     return [.M3, .P5, .M7]
         case .minorSeventh:                     return [.m3, .P5, .m7]
         case .minorMajorSeventh:                return [.m3, .P5, .M7]
@@ -207,7 +211,8 @@ extension ChordType: CustomStringConvertible {
         case .halfDiminishedSeventh:            return "ø7"
         case .diminishedSeventh:                return "°7"
         case .dominantSeventh:                  return "7"
-        case .dominantSeventhSus4:              return "7sus4"
+        case .dominantSeventhSuspendedFourth:   return "7sus4"
+        case .dominantSeventhSuspendedSecond:   return "7sus2"
         case .majorSeventh:                     return "maj7"
         case .minorSeventh:                     return "m7"
         case .minorMajorSeventh:                return "mMaj7"
@@ -260,7 +265,8 @@ extension ChordType: CustomStringConvertible {
         case .halfDiminishedSeventh:            return "Ø7"
         case .diminishedSeventh:                return "º7"
         case .dominantSeventh:                  return "7"
-        case .dominantSeventhSus4:              return "7sus4"
+        case .dominantSeventhSuspendedFourth:   return "7sus4"
+        case .dominantSeventhSuspendedSecond:   return "7sus2"
         case .majorSeventh:                     return "^7"
         case .minorSeventh:                     return "m7"
         case .minorMajorSeventh:                return "m^7"
diff --git a/Tests/TonicTests/ChordTests.swift b/Tests/TonicTests/ChordTests.swift
index 8935e95..421415d 100644
--- a/Tests/TonicTests/ChordTests.swift
+++ b/Tests/TonicTests/ChordTests.swift
@@ -43,8 +43,15 @@ class ChordTests: XCTestCase {
     func test7sus4() {
         let notes: [Int8] = [60, 65, 67, 70]
         let pitchSet =  PitchSet(pitches: notes.map { Pitch($0) } )
-        let c7 = Chord.getRankedChords(from: pitchSet)
-        XCTAssertEqual(c7.map { $0.description }, ["C7sus4"])
+        let c7sus4 = Chord.getRankedChords(from: pitchSet)
+        XCTAssertEqual(c7sus4.map { $0.description }, ["C7sus4"])
+    }
+
+    func test7sus2() {
+        let notes: [Int8] = [60, 62, 67, 70]
+        let pitchSet =  PitchSet(pitches: notes.map { Pitch($0) } )
+        let c7sus2 = Chord.getRankedChords(from: pitchSet)
+        XCTAssertEqual(c7sus2.map { $0.description }, ["C7sus2"])
     }
 
     func testAugmentedDiminishededChordsPreferNoInversions() {