From de9bb5a7ccb4606efe5ab11f6c1e24407ad4408b Mon Sep 17 00:00:00 2001
From: Trevor Pilley <TrevorPilley@users.noreply.github.com>
Date: Thu, 4 Apr 2024 09:59:12 +0000
Subject: [PATCH] Add SharesCallingCodeWith

---
 src/PhoneNumbers/CountryInfo.cs             |  7 +++++++
 test/PhoneNumbers.Tests/CountryInfoTests.cs | 14 ++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/PhoneNumbers/CountryInfo.cs b/src/PhoneNumbers/CountryInfo.cs
index e06eea63..31babb25 100644
--- a/src/PhoneNumbers/CountryInfo.cs
+++ b/src/PhoneNumbers/CountryInfo.cs
@@ -233,6 +233,13 @@ internal string ReadNationalSignificantNumber(string value)
         return ReadNationalSignificantNumber(value, startIdx);
     }
 
+    /// <summary>
+    /// Gets a value indicting whether this <see cref="CountryInfo"/> shares a calling code with the specified <see cref="CountryInfo"/>.
+    /// </summary>
+    /// <returns>True if the both countries share a calling code, otherwise false.</returns>
+    internal bool SharesCallingCodeWith(CountryInfo countryInfo) =>
+        CallingCode.Equals(countryInfo?.CallingCode, StringComparison.Ordinal);
+
     /// <remarks>Char.IsDigit returns true for more than 0-9 so use a more restricted version.</remarks>
     private static bool IsDigit(char charVal) =>
         charVal is >= '0' and <= '9';
diff --git a/test/PhoneNumbers.Tests/CountryInfoTests.cs b/test/PhoneNumbers.Tests/CountryInfoTests.cs
index 6afb8864..e810688a 100644
--- a/test/PhoneNumbers.Tests/CountryInfoTests.cs
+++ b/test/PhoneNumbers.Tests/CountryInfoTests.cs
@@ -257,6 +257,20 @@ public void ReadNationalSignificantNumber_Without_TrunkPrefix(string value) =>
                 .CreateCountryInfo(trunkPrefix: null, nsnLengths: new[] { 8 })
                 .ReadNationalSignificantNumber(value));
 
+    [Fact]
+    public void ShareCallingCodeWith()
+    {
+        Assert.False(CountryInfo.Canada.SharesCallingCodeWith(CountryInfo.France));
+
+        Assert.True(CountryInfo.Canada.SharesCallingCodeWith(CountryInfo.UnitedStates));
+        Assert.True(CountryInfo.Guernsey.SharesCallingCodeWith(CountryInfo.IsleOfMan));
+        Assert.True(CountryInfo.Guernsey.SharesCallingCodeWith(CountryInfo.Jersey));
+        Assert.True(CountryInfo.Guernsey.SharesCallingCodeWith(CountryInfo.UnitedKingdom));
+        Assert.True(CountryInfo.UnitedKingdom.SharesCallingCodeWith(CountryInfo.Guernsey));
+        Assert.True(CountryInfo.UnitedKingdom.SharesCallingCodeWith(CountryInfo.IsleOfMan));
+        Assert.True(CountryInfo.UnitedKingdom.SharesCallingCodeWith(CountryInfo.Jersey));
+    }
+    
     [Fact]
     public void When_Constructed()
     {