diff --git a/spec/test-common.cr b/spec/test-common.cr
index 5a4f1bf..8025c6e 100644
--- a/spec/test-common.cr
+++ b/spec/test-common.cr
@@ -1,6 +1,10 @@
 require "spec"
 require "./db-cars.cr"
 
+# NOTE: the following tests access both database and triggers' caches directly.
+# It must not be done in real applications.
+# `data` and `lru` properties are implementation details.
+
 describe "SPECDB::Common" do
 	it "basics, 3 values" do
 		car0 = Car.new "Corvet-0", "red", [] of String
@@ -30,4 +34,90 @@ describe "SPECDB::Common" do
 		db.data.keys.sort.should eq([0, 3] of Int32)
 		db.lru.to_s.should eq "[ 3, 0 ]"
 	end
+
+	it "add some values, reindex, check the values" do
+		car0 = Car.new "Corvet-0", "red", [] of String
+		car1 = Car.new "Corvet-1", "red", [] of String
+		car2 = Car.new "Corvet-2", "red", [] of String
+		car3 = Car.new "Corvet-3", "red", [] of String
+
+		db = SPECDB::Common(Car).new "reindex", 2
+		index_name  = db.new_index     "name",  &.name
+		index_color = db.new_partition "color", &.color
+
+		db.data.keys.sort.should eq([] of Int32)
+
+		db << car0
+		db.data.keys.sort.should eq([0] of Int32)
+
+		db << car1
+		db.data.keys.sort.should eq([0, 1] of Int32)
+		db.lru.to_s.should eq "[ 1, 0 ]"
+
+		db.data.keys.sort.should eq([0, 1] of Int32)
+		db.lru.to_s.should eq "[ 1, 0 ]"
+
+		db << car2
+		db.data.keys.sort.should eq([1, 2] of Int32)
+		db.lru.to_s.should eq "[ 2, 1 ]"
+		db[0] # Let's use the first value, it shouldn't be the one to be dropped.
+
+		db << car3
+		db.data.keys.sort.should eq([0, 3] of Int32)
+		db.lru.to_s.should eq "[ 3, 0 ]"
+
+		# Actually remove the value indexed "2".
+		db.delete 2
+		# The "delete" action actually puts the value in the cache before removing it.
+		db.data.keys.sort.should eq([3] of Int32)
+		db.lru.to_s.should eq "[ 3 ]"
+
+		# db2: further tests for the LRU behavior, with `reindex_everything!` for example.
+		db2 = SPECDB::Common(Car).new "reindex", 2, false
+		index2_name  = db2.new_index     "name",  &.name
+
+		# For now, we didn't use any value in the database.
+		# Also, triggers should have empty caches.
+		db2.data.keys.sort.should eq([] of Int32)
+		db2.lru.to_s.should eq "[  ]"
+		index2_name.get?("Corvet-0").should eq car0
+
+		# Reindex removes all triggers (hard rm -rf trigger-dir) then reads all
+		# data from the file-system to run the triggers. Data is put into the cache
+		# of the `Common` database.
+		db2.reindex_everything!
+
+		# Values 1 and 3 are the last recently used values following `reindex_everything!`.
+		db2.data.keys.sort.should eq([1, 3] of Int32)
+		db2.lru.to_s.should eq "[ 3, 1 ]"
+
+		total_values = 0
+		db2.each_with_key do |v, k|
+			total_values += 1
+		end
+		total_values.should eq 3
+
+		# db3: no need for a reindex to access values from the database,
+		# with `each` or `each_with_key` for example.
+		db3 = SPECDB::Common(Car).new "reindex", 2, false
+		total_values = 0
+		db3.each do |v|
+			total_values += 1
+		end
+		total_values.should eq 3
+
+		# db4: no need for a reindex to access values from triggers.
+		db4 = SPECDB::Common(Car).new "reindex", 2, false
+		index4_name  = db4.new_index     "name",  &.name
+		index4_color = db4.new_partition "color", &.color
+
+		index4_name.data.size.should eq 0 # trigger cache is empty
+		index4_name.get?("Corvet-3").should eq car3
+		index4_name.data.size.should eq 1 # trigger cache: one value, Corvet-3
+
+		index4_color.data.size.should eq 0 # trigger cache is empty
+		index4_color.get("red").size.should eq 3 # read from the disk
+		index4_color.data.size.should eq 1 # trigger cache: 1, the color "red"
+		index4_color.data["red"].size.should eq 3 # 3 values in "red"
+	end
 end