feat: deterministic email-driven status suggestions

New EmailStatusClassifier scans a message subject/body for outcome signals (interview invite, offer, rejection) and suggests a canonical pipeline status. Priority-ordered so a rejection that mentions the prior interview still classifies as Rejected. Deterministic - no AI - so it is instant, reproducible, and safe. - GET /api/jobapplications/{id}/status-suggestion reads the job's latest inbound correspondence (incl. Gmail imports) and suggests a forward status move, suppressed when already in/past that stage - always human-confirmed via the existing PATCH .../status - 7 classifier unit tests + 2 endpoint integration tests; backend green (133) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-03 03:48:32 +02:00
parent 695fbd6d21
commit ae3505b877
4 changed files with 235 additions and 0 deletions
@@ -0,0 +1,61 @@
+using JobTrackerApi.Services;
+using Xunit;
+
+namespace JobTrackerApi.Tests;
+
+public sealed class EmailStatusClassifierTests
+{
+    [Fact]
+    public void Detects_rejection()
+    {
+        var s = EmailStatusClassifier.Classify("Your application", "Thank you for your time. Unfortunately, we have decided not to proceed with your application.");
+        Assert.NotNull(s);
+        Assert.Equal("Rejected", s!.SuggestedStatus);
+    }
+
+    [Fact]
+    public void Detects_offer()
+    {
+        var s = EmailStatusClassifier.Classify("Great news", "We are pleased to offer you the position of Backend Engineer.");
+        Assert.NotNull(s);
+        Assert.Equal("Offer", s!.SuggestedStatus);
+    }
+
+    [Fact]
+    public void Detects_interview_invite()
+    {
+        var s = EmailStatusClassifier.Classify("Next steps", "We would like to invite you to interview next week. What is your availability for a call?");
+        Assert.NotNull(s);
+        Assert.Equal("Interview", s!.SuggestedStatus);
+    }
+
+    [Fact]
+    public void Rejection_wins_over_interview_mention()
+    {
+        // A rejection email that references the interview the candidate had must classify as Rejected.
+        var s = EmailStatusClassifier.Classify(
+            "Update on your application",
+            "Thank you for taking the time to interview with us. Unfortunately, we will not be moving forward.");
+        Assert.NotNull(s);
+        Assert.Equal("Rejected", s!.SuggestedStatus);
+    }
+
+    [Fact]
+    public void Weak_interview_cue_is_low_confidence()
+    {
+        var s = EmailStatusClassifier.Classify("Coding challenge", "Please complete this take-home assessment.");
+        Assert.NotNull(s);
+        Assert.Equal("Interview", s!.SuggestedStatus);
+        Assert.Equal("low", s.Confidence);
+    }
+
+    [Fact]
+    public void Returns_null_for_neutral_email()
+    {
+        Assert.Null(EmailStatusClassifier.Classify("Re: question", "Thanks for the info, that answers my question about the parking."));
+    }
+
+    [Fact]
+    public void Handles_empty_input()
+        => Assert.Null(EmailStatusClassifier.Classify(null, null));
+}