1 files changed, 35 insertions, 0 deletions
diff --git a/tests/Cepis.Tests/NormalizeTests.cs b/tests/Cepis.Tests/NormalizeTests.cs
new file mode 100644
index 0000000..3ff60cb
--- /dev/null
+++ b/tests/Cepis.Tests/NormalizeTests.cs
@@ -0,0 +1,35 @@
+namespace Cepis.Tests;
+
+/// <summary>Local validation, which happens before any request.</summary>
+public sealed class NormalizeTests
+{
+    [Theory]
+    [InlineData("01001000", "01001000")]
+    [InlineData("01001-000", "01001000")]
+    [InlineData(" 01001-000 ", "01001000")]
+    [InlineData("01.001-000", "01001000")]
+    [InlineData("01 001 000", "01001000")]
+    public void AcceptsTheMask(string input, string expected) =>
+        Assert.Equal(expected, CepisClient.NormalizeCep(input));
+
+    [Theory]
+    [InlineData("")]
+    [InlineData("0100100")]
+    [InlineData("010010000")]
+    [InlineData("0100100a")]
+    [InlineData("abcdefgh")]
+    [InlineData("01001-00")]
+    public void RejectsAnythingElse(string input) =>
+        Assert.Throws<InvalidCepException>(() => CepisClient.NormalizeCep(input));
+
+    [Fact]
+    public void RejectsNull() =>
+        Assert.Throws<InvalidCepException>(() => CepisClient.NormalizeCep(null!));
+
+    [Fact]
+    public void TheMessageCarriesWhatWasGiven()
+    {
+        var failure = Assert.Throws<InvalidCepException>(() => CepisClient.NormalizeCep("123"));
+        Assert.Contains("123", failure.Message, StringComparison.Ordinal);
+    }
+}