Add vendor assessment agent

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/agent/tools/search/diff_test.go

@@ -0,0 +1,203 @@
+// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package search
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestComputeDiff(t *testing.T) {
+	t.Parallel()
+
+	t.Run(
+		"identical documents have no changes",
+		func(t *testing.T) {
+			t.Parallel()
+
+			lines := []string{"line one", "line two", "line three"}
+			diff := computeDiff(lines, lines, "a", "b")
+
+			assert.Equal(t, 0, diff.added)
+			assert.Equal(t, 0, diff.removed)
+		},
+	)
+
+	t.Run(
+		"completely different documents",
+		func(t *testing.T) {
+			t.Parallel()
+
+			linesA := []string{"alpha", "beta"}
+			linesB := []string{"gamma", "delta"}
+			diff := computeDiff(linesA, linesB, "a", "b")
+
+			assert.Equal(t, 2, diff.added)
+			assert.Equal(t, 2, diff.removed)
+			assert.Contains(t, diff.output, "- alpha")
+			assert.Contains(t, diff.output, "- beta")
+			assert.Contains(t, diff.output, "+ gamma")
+			assert.Contains(t, diff.output, "+ delta")
+		},
+	)
+
+	t.Run(
+		"added lines only",
+		func(t *testing.T) {
+			t.Parallel()
+
+			linesA := []string{"line one"}
+			linesB := []string{"line one", "line two", "line three"}
+			diff := computeDiff(linesA, linesB, "a", "b")
+
+			assert.Equal(t, 2, diff.added)
+			assert.Equal(t, 0, diff.removed)
+			assert.Contains(t, diff.output, "+ line two")
+			assert.Contains(t, diff.output, "+ line three")
+		},
+	)
+
+	t.Run(
+		"removed lines only",
+		func(t *testing.T) {
+			t.Parallel()
+
+			linesA := []string{"line one", "line two", "line three"}
+			linesB := []string{"line one"}
+			diff := computeDiff(linesA, linesB, "a", "b")
+
+			assert.Equal(t, 0, diff.added)
+			assert.Equal(t, 2, diff.removed)
+			assert.Contains(t, diff.output, "- line two")
+			assert.Contains(t, diff.output, "- line three")
+		},
+	)
+
+	t.Run(
+		"mixed changes",
+		func(t *testing.T) {
+			t.Parallel()
+
+			linesA := []string{"keep", "remove me", "also keep"}
+			linesB := []string{"keep", "add me", "also keep"}
+			diff := computeDiff(linesA, linesB, "a", "b")
+
+			assert.Equal(t, 1, diff.added)
+			assert.Equal(t, 1, diff.removed)
+			assert.Contains(t, diff.output, "- remove me")
+			assert.Contains(t, diff.output, "+ add me")
+		},
+	)
+
+	t.Run(
+		"both inputs empty",
+		func(t *testing.T) {
+			t.Parallel()
+
+			diff := computeDiff([]string{}, []string{}, "a", "b")
+
+			assert.Equal(t, 0, diff.added)
+			assert.Equal(t, 0, diff.removed)
+		},
+	)
+
+	t.Run(
+		"first input empty",
+		func(t *testing.T) {
+			t.Parallel()
+
+			linesB := []string{"new line"}
+			diff := computeDiff([]string{}, linesB, "a", "b")
+
+			assert.Equal(t, 1, diff.added)
+			assert.Equal(t, 0, diff.removed)
+			assert.Contains(t, diff.output, "+ new line")
+		},
+	)
+
+	t.Run(
+		"second input empty",
+		func(t *testing.T) {
+			t.Parallel()
+
+			linesA := []string{"old line"}
+			diff := computeDiff(linesA, []string{}, "a", "b")
+
+			assert.Equal(t, 0, diff.added)
+			assert.Equal(t, 1, diff.removed)
+			assert.Contains(t, diff.output, "- old line")
+		},
+	)
+
+	t.Run(
+		"single line documents identical",
+		func(t *testing.T) {
+			t.Parallel()
+
+			diff := computeDiff([]string{"same"}, []string{"same"}, "a", "b")
+
+			assert.Equal(t, 0, diff.added)
+			assert.Equal(t, 0, diff.removed)
+		},
+	)
+
+	t.Run(
+		"single line documents different",
+		func(t *testing.T) {
+			t.Parallel()
+
+			diff := computeDiff([]string{"old"}, []string{"new"}, "a", "b")
+
+			assert.Equal(t, 1, diff.added)
+			assert.Equal(t, 1, diff.removed)
+		},
+	)
+
+	t.Run(
+		"output contains labels",
+		func(t *testing.T) {
+			t.Parallel()
+
+			diff := computeDiff(
+				[]string{"a"},
+				[]string{"b"},
+				"current version",
+				"archived version",
+			)
+
+			assert.True(t, strings.HasPrefix(diff.output, "--- current version\n+++ archived version\n"))
+		},
+	)
+
+	t.Run(
+		"documents too large returns bounded message",
+		func(t *testing.T) {
+			t.Parallel()
+
+			large := make([]string, 5001)
+			for i := range large {
+				large[i] = "line"
+			}
+
+			diff := computeDiff(large, []string{"small"}, "a", "b")
+
+			assert.Equal(t, 0, diff.added)
+			assert.Equal(t, 0, diff.removed)
+			assert.Contains(t, diff.output, "too large")
+		},
+	)
+}