Add tests for k8s instance, log, and metric modules

k8s/instance/list

@@ -36,4 +36,4 @@ echo "$PODS" | jq --argjson limit ${LIMIT:-10} '{
    launch_time: .metadata.creationTimestamp,
    spot: (.spec.nodeName // "" | test("spot"; "i"))
  })
-}'
+}'

k8s/instance/tests/build_context.bats

@@ -0,0 +1,107 @@
+#!/usr/bin/env bats
+# =============================================================================
+# Unit tests for instance/build_context - instance parameter extraction
+# =============================================================================
+
+setup() {
+  export PROJECT_ROOT="$(cd "$BATS_TEST_DIRNAME/../../.." && pwd)"
+  source "$PROJECT_ROOT/testing/assertions.sh"
+
+  export SCRIPT="$BATS_TEST_DIRNAME/../build_context"
+
+  export CONTEXT='{
+    "arguments": {
+      "application_id": "app-123",
+      "scope_id": "scope-456",
+      "deployment_id": "deploy-789"
+    }
+  }'
+
+  export LIMIT=10
+}
+
+teardown() {
+  unset CONTEXT LIMIT APPLICATION_ID SCOPE_ID DEPLOYMENT_ID
+}
+
+# =============================================================================
+# Success flow
+# =============================================================================
+@test "instance/build_context: exports all parameters correctly" {
+  source "$SCRIPT"
+
+  assert_equal "$APPLICATION_ID" "app-123"
+  assert_equal "$SCOPE_ID" "scope-456"
+  assert_equal "$DEPLOYMENT_ID" "deploy-789"
+  assert_equal "$LIMIT" "10"
+}
+
+@test "instance/build_context: produces no stdout output" {
+  run bash -c 'source "$SCRIPT"'
+
+  assert_equal "$status" "0"
+  assert_equal "$output" ""
+}
+
+# =============================================================================
+# Array argument handling
+# =============================================================================
+@test "instance/build_context: handles array arguments (takes first element)" {
+  export CONTEXT='{
+    "arguments": {
+      "application_id": ["app-first", "app-second"],
+      "scope_id": ["scope-first", "scope-second"],
+      "deployment_id": ["deploy-first", "deploy-second"]
+    }
+  }'
+
+  source "$SCRIPT"
+
+  assert_equal "$APPLICATION_ID" "app-first"
+  assert_equal "$SCOPE_ID" "scope-first"
+  assert_equal "$DEPLOYMENT_ID" "deploy-first"
+}
+
+# =============================================================================
+# Missing / null arguments
+# =============================================================================
+@test "instance/build_context: handles missing arguments" {
+  export CONTEXT='{
+    "arguments": {}
+  }'
+
+  source "$SCRIPT"
+
+  assert_equal "$APPLICATION_ID" "null"
+  assert_equal "$SCOPE_ID" "null"
+  assert_equal "$DEPLOYMENT_ID" "null"
+}
+
+@test "instance/build_context: handles null arguments object" {
+  export CONTEXT='{}'
+
+  source "$SCRIPT"
+
+  assert_empty "$APPLICATION_ID"
+  assert_empty "$SCOPE_ID"
+  assert_empty "$DEPLOYMENT_ID"
+}
+
+# =============================================================================
+# LIMIT handling
+# =============================================================================
+@test "instance/build_context: uses default LIMIT of 10 when not set" {
+  unset LIMIT
+
+  source "$SCRIPT"
+
+  assert_equal "$LIMIT" "10"
+}
+
+@test "instance/build_context: preserves custom LIMIT" {
+  export LIMIT=50
+
+  source "$SCRIPT"
+
+  assert_equal "$LIMIT" "50"
+}