diff --git a/plpgsql/pgunit/Dockerfile b/plpgsql/pgunit/Dockerfile
new file mode 100644
index 00000000..4c3cc347
--- /dev/null
+++ b/plpgsql/pgunit/Dockerfile
@@ -0,0 +1,20 @@
+FROM postgres:12.1
+WORKDIR /app
+
+ENV PGHOST=localhost
+ENV PGDATABASE=kata
+ENV PGPASSWORD=admin
+ENV PGUSER=postgres
+ENV POSTGRES_PASSWORD=admin
+ENV PGDATA /var/lib/postgresql/data_local
+
+RUN mkdir -p "$PGDATA" && chown -R postgres:postgres "$PGDATA" && chmod 777 "$PGDATA"
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends ca-certificates wget \
+ && rm -rf /var/lib/apt/lists/*
+
+ADD ./*.sh /app/
+ADD ./*.sql /app/
+RUN chmod +x ./*.sh \
+ && ./initializeDocker.sh
diff --git a/plpgsql/pgunit/asserts.sql b/plpgsql/pgunit/asserts.sql
new file mode 100644
index 00000000..d51b5b6a
--- /dev/null
+++ b/plpgsql/pgunit/asserts.sql
@@ -0,0 +1,59 @@
+CREATE OR REPLACE FUNCTION test_assertEquals(message TEXT, expected ANYELEMENT, result ANYELEMENT) RETURNS VOID AS $$
+BEGIN
+  IF expected = result THEN
+    null;
+  ELSE
+    raise exception '%: expect ''%'' instead of ''%''', message, expected, result using errcode = 'triggered_action_exception';
+  END IF;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_assertEquals(expected ANYELEMENT, result ANYELEMENT) RETURNS VOID AS $$
+BEGIN
+  perform test_assertEquals('assertEquals failure', expected, result);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_assertEqualsArray(expected VARCHAR[], result VARCHAR[]) RETURNS VOID AS $$
+DECLARE
+  line RECORD;
+  error_message text;
+BEGIN
+  IF expected = result THEN
+    null;
+  ELSE
+    error_message := 'assertEqualsArray failure:';
+    FOR line IN SELECT expected_item, result_item FROM (SELECT unnest(expected) AS expected_item, unnest(result) AS result_item) x
+    LOOP
+      IF line.expected_item = line.result_item THEN
+        error_message := CONCAT(error_message, E'\n', '= ', line.expected_item);
+      ELSE
+        error_message := CONCAT(error_message, E'\n', '- ', line.expected_item);
+        error_message := CONCAT(error_message, E'\n', '+ ', line.result_item);
+      END IF;
+    END LOOP;
+
+    raise exception '%', error_message using errcode = 'triggered_action_exception';
+  END IF;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_assertEquals_golden_master(expected VARCHAR[], result VARCHAR[]) RETURNS VOID as $$
+DECLARE
+    golden TEXT;
+    line VARCHAR;
+BEGIN
+  perform test_assertEqualsArray(expected, result);
+EXCEPTION
+  WHEN triggered_action_exception THEN
+    golden := CONCAT(SQLERRM, E'\n\n', E'For update, copy:\n');
+    golden := CONCAT(golden, E'expected := ARRAY[');
+    FOREACH line IN ARRAY result
+    LOOP
+      golden := CONCAT(golden, E'\n', '''', line, ''',');
+    END LOOP;
+    golden := CONCAT(golden, E'\n', '];');
+
+    raise exception '%', golden using errcode = 'triggered_action_exception';
+END;
+$$ LANGUAGE plpgsql;
diff --git a/plpgsql/pgunit/asserts_tests.sql b/plpgsql/pgunit/asserts_tests.sql
new file mode 100644
index 00000000..05cd77f1
--- /dev/null
+++ b/plpgsql/pgunit/asserts_tests.sql
@@ -0,0 +1,95 @@
+CREATE OR REPLACE FUNCTION test_case_assertEquals_numeric_should_fail_if_not_equals() RETURNS VOID AS $$
+DECLARE
+  expected_message VARCHAR;
+  error_message VARCHAR;
+  is_equals BOOLEAN;
+BEGIN
+  BEGIN
+    perform test_assertEquals(7, 5);
+  EXCEPTION
+    WHEN triggered_action_exception THEN
+      expected_message := 'assertEquals failure: expect ''7'' instead of ''5''';
+      error_message := SQLERRM;
+      perform test_assertTrue(format('Expect message ''%s'' instead of ''%s'' ', expected_message, error_message), error_message = expected_message);
+  END;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_case_assertEquals_numeric_should_success_if_equals() RETURNS VOID AS $$
+BEGIN
+  perform test_assertEquals(7, 7);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_case_assertEquals_text_should_fail_if_not_equals() RETURNS VOID AS $$
+DECLARE
+  expected_message VARCHAR;
+  error_message VARCHAR;
+  is_equals BOOLEAN;
+BEGIN
+  BEGIN
+    perform test_assertEquals('hello'::VARCHAR, 'olleh');
+  EXCEPTION
+    WHEN triggered_action_exception THEN
+      expected_message := 'assertEquals failure: expect ''hello'' instead of ''olleh''';
+      error_message := SQLERRM;
+      perform test_assertTrue(format('Expect message ''%s'' instead of ''%s'' ', expected_message, error_message), error_message = expected_message);
+  END;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_case_assertEquals_text_should_success_if_equals() RETURNS VOID AS $$
+BEGIN
+  perform test_assertEquals('hello'::VARCHAR, 'hello');
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_case_assertEquals_should_display_custom_message_if_defined() RETURNS VOID AS $$
+DECLARE
+  expected_message VARCHAR;
+  error_message VARCHAR;
+  is_equals BOOLEAN;
+BEGIN
+  BEGIN
+    perform test_assertEquals('Test with custom message', 'hello'::VARCHAR, 'olleh');
+  EXCEPTION
+    WHEN triggered_action_exception THEN
+      expected_message := 'Test with custom message: expect ''hello'' instead of ''olleh''';
+      error_message := SQLERRM;
+      perform test_assertTrue(format('Expect message ''%s'' instead of ''%s'' ', expected_message, error_message), error_message = expected_message);
+  END;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_case_assertEqualsArray_should_success_if_equals() RETURNS VOID AS $$
+BEGIN
+  perform test_assertEqualsArray(ARRAY['1','2'], ARRAY['1','2']);
+  perform test_assertEqualsArray(ARRAY['a','b'], ARRAY['a','b']);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_case_assertEqualsArray_should_display_diff_if_failed() RETURNS VOID AS $$
+DECLARE
+  expected_message VARCHAR;
+  error_message VARCHAR;
+  is_equals BOOLEAN;
+BEGIN
+  BEGIN
+    perform test_assertEqualsArray(ARRAY['1','2','3','4'], ARRAY['1','2','4','4']);
+  EXCEPTION
+    WHEN triggered_action_exception THEN
+      expected_message := CONCAT(
+        'assertEqualsArray failure:', E'\n',
+        '= 1', E'\n',
+        '= 2', E'\n',
+        '- 3', E'\n',
+        '+ 4', E'\n',
+        '= 4'
+      );
+      error_message := SQLERRM;
+      perform test_assertTrue(format('Expect message ''%s'' instead of ''%s'' ', expected_message, error_message), error_message = expected_message);
+  END;
+END;
+$$ LANGUAGE plpgsql;
+
+SELECT * FROM test_run_all();
diff --git a/plpgsql/pgunit/docker-compose.yml b/plpgsql/pgunit/docker-compose.yml
new file mode 100644
index 00000000..60183e85
--- /dev/null
+++ b/plpgsql/pgunit/docker-compose.yml
@@ -0,0 +1,16 @@
+version: '3'
+
+services:
+  database:
+    build: .
+    ports:
+    - "5432:5432"
+    volumes:
+    - .:/app/:z
+
+  admin:
+    image: adminer
+    links:
+    - database
+    ports:
+    - "8081:8080"
diff --git a/plpgsql/pgunit/initializeDatabase.sh b/plpgsql/pgunit/initializeDatabase.sh
new file mode 100644
index 00000000..12b1d33d
--- /dev/null
+++ b/plpgsql/pgunit/initializeDatabase.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -ex
+
+echo "Create database"
+psql -d postgres -c 'DROP DATABASE IF EXISTS kata;'
+psql -d postgres -c 'CREATE DATABASE kata;'
+psql -d kata -c 'CREATE EXTENSION DBLINK;'
+
+echo "Initialize test framework"
+wget https://raw.githubusercontent.com/adrianandrei-ca/pgunit/bc69dfc526ec3db55ff72af5d78eab55661502af/PGUnit.sql \
+ && psql -d kata -f PGUnit.sql \
+ && rm PGUnit.sql
+
+echo "Initialize custom asserts"
+psql -d kata -f asserts.sql
+
+echo "Add current code"
+psql -d kata -f item.sql
+psql -d kata -f new_item.sql
+psql -d kata -f update_quality.sql
diff --git a/plpgsql/pgunit/initializeDocker.sh b/plpgsql/pgunit/initializeDocker.sh
new file mode 100644
index 00000000..e962623a
--- /dev/null
+++ b/plpgsql/pgunit/initializeDocker.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+wait_database()
+{
+    while :
+    do
+        (echo > /dev/tcp/127.0.0.1/5432) >/dev/null 2>&1
+        result=$?
+
+        if [[ $result -eq 0 ]]; then
+            break
+        fi
+        sleep 1
+    done
+    return $result
+}
+
+nohup docker-entrypoint.sh postgres  > /dev/null 2>&1 &
+wait_database
+
+set -ex
+
+./initializeDatabase.sh
+
+echo "Stop database"
+disown %1
diff --git a/plpgsql/pgunit/item.sql b/plpgsql/pgunit/item.sql
new file mode 100644
index 00000000..1b59331e
--- /dev/null
+++ b/plpgsql/pgunit/item.sql
@@ -0,0 +1,8 @@
+DROP TABLE IF EXISTS item;
+CREATE TABLE item
+  (
+    name    character varying(100) NOT NULL,
+    sell_in numeric(6) NOT NULL,
+    quality numeric(6) NOT NULL
+  );
+
diff --git a/plpgsql/pgunit/new_item.sql b/plpgsql/pgunit/new_item.sql
new file mode 100644
index 00000000..e78d712f
--- /dev/null
+++ b/plpgsql/pgunit/new_item.sql
@@ -0,0 +1,12 @@
+DROP PROCEDURE IF EXISTS new_item;
+CREATE PROCEDURE new_item(
+      name item.name%TYPE,
+      sell_in item.sell_in%TYPE,
+      quality item.quality%TYPE
+  )
+LANGUAGE plpgsql
+AS $$
+BEGIN
+  INSERT INTO item (name, sell_in, quality) VALUES (name, sell_in, quality);
+END;
+$$;
diff --git a/plpgsql/pgunit/readme.md b/plpgsql/pgunit/readme.md
new file mode 100644
index 00000000..6421ed1c
--- /dev/null
+++ b/plpgsql/pgunit/readme.md
@@ -0,0 +1,10 @@
+## Requirement
+Testing on postgres 12  
+Unit test framework used : pgunit (https://github.com/adrianandrei-ca/pgunit)  
+
+## Setup
+Run `docker-compose up -d` to start, and `docker-compose exec database bash` to enter in container.  
+You can run `cat update_quality.sql run_tests.sql | psql -d kata -f -`
+
+## Kata
+`update_quality.sql` contains code to refactor, and `run_tests.sql` contains test examples.
diff --git a/plpgsql/pgunit/run_tests.sql b/plpgsql/pgunit/run_tests.sql
new file mode 100644
index 00000000..3c4e3c68
--- /dev/null
+++ b/plpgsql/pgunit/run_tests.sql
@@ -0,0 +1,95 @@
+CREATE OR REPLACE FUNCTION test_case_update_quality() RETURNS void AS $$
+DECLARE
+  name_result item.name%TYPE;
+BEGIN
+  TRUNCATE TABLE item;
+  CALL new_item('foo', 0, 0);
+
+  CALL update_quality();
+
+  SELECT name FROM item INTO name_result;
+  perform test_assertEquals('name did change', 'fixme', name_result);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION format_day(day INTEGER) RETURNS TEXT[] AS $$
+DECLARE
+  result TEXT[];
+  item_result RECORD;
+BEGIN
+  result := ARRAY[CONCAT('-------- day ', day, ' --------')];
+  result := result || 'name, sellIn, quality'::TEXT;
+
+  FOR item_result IN (SELECT name, sell_in, quality FROM item ORDER BY name ASC, sell_in ASC, quality ASC)
+  LOOP
+    result := result || format('%s, %s, %s', item_result.name, item_result.sell_in, item_result.quality);
+  END LOOP;
+
+  RETURN result;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION test_case_update_quality_golden_master() RETURNS VOID AS $$
+DECLARE
+  sell_in_result item.sell_in%TYPE;
+  quality_result item.quality%TYPE;
+  days INTEGER;
+  result TEXT[];
+  expected TEXT[];
+  item_result RECORD;
+BEGIN
+  -- given
+  TRUNCATE TABLE item;
+  CALL new_item('+5 Dexterity Vest', 10, 20);
+  CALL new_item('Aged Brie', 2, 0);
+  CALL new_item('Elixir of the Mongoose', 5, 7);
+  CALL new_item('Sulfuras, Hand of Ragnaros', 0, 80);
+  CALL new_item('Sulfuras, Hand of Ragnaros', -1, 80);
+  CALL new_item('Backstage passes to a TAFKAL80ETC concert', 15, 20);
+  CALL new_item('Backstage passes to a TAFKAL80ETC concert', 10, 49);
+  CALL new_item('Backstage passes to a TAFKAL80ETC concert', 5, 49);
+  -- this conjured item does not work properly yet ;
+  CALL new_item('Conjured Mana Cake', 3, 6);
+  days := 1;
+
+  -- when
+  result := format_day(0);
+  FOR current_day IN 1 .. days
+  LOOP
+    CALL update_quality();
+
+    result := result || format_day(current_day);
+  END LOOP;
+
+  -- then
+  expected := ARRAY[ 
+    '-------- day 0 --------',
+    'name, sellIn, quality',
+    '+5 Dexterity Vest, 10, 20',
+    'Aged Brie, 2, 0',
+    'Backstage passes to a TAFKAL80ETC concert, 5, 49', 
+    'Backstage passes to a TAFKAL80ETC concert, 10, 49',
+    'Backstage passes to a TAFKAL80ETC concert, 15, 20',
+    'Conjured Mana Cake, 3, 6', 
+    'Elixir of the Mongoose, 5, 7', 
+    'Sulfuras, Hand of Ragnaros, -1, 80', 
+    'Sulfuras, Hand of Ragnaros, 0, 80',
+    '-------- day 1 --------',
+    'name, sellIn, quality',
+    '+5 Dexterity Vest, 9, 19', 
+    'Aged Brie, 1, 1',
+    'Backstage passes to a TAFKAL80ETC concert, 4, 50', 
+    'Backstage passes to a TAFKAL80ETC concert, 9, 50', 
+    'Backstage passes to a TAFKAL80ETC concert, 14, 21',
+    'Conjured Mana Cake, 2, 5', 
+    'Elixir of the Mongoose, 4, 6', 
+    'Sulfuras, Hand of Ragnaros, -1, 80', 
+    'Sulfuras, Hand of Ragnaros, 0, 80'
+  ];
+
+  perform test_assertEquals_golden_master(expected, result);
+END;
+$$ LANGUAGE plpgsql;
+
+
+SELECT * FROM test_run_all();
\ No newline at end of file
diff --git a/plpgsql/pgunit/update_quality.sql b/plpgsql/pgunit/update_quality.sql
new file mode 100644
index 00000000..e19d6863
--- /dev/null
+++ b/plpgsql/pgunit/update_quality.sql
@@ -0,0 +1,72 @@
+CREATE OR REPLACE PROCEDURE update_quality()
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  c_items CURSOR FOR
+    SELECT name, sell_in, quality FROM item FOR UPDATE;
+  l_item RECORD;
+  l_name item.name%TYPE;
+  l_sell_in item.sell_in%TYPE;
+  l_quality item.quality%TYPE;
+BEGIN
+  OPEN c_items;
+  LOOP
+    FETCH c_items INTO l_item;
+    EXIT WHEN NOT FOUND;
+
+    l_name    := l_item.name;
+    l_sell_in := l_item.sell_in;
+    l_quality := l_item.quality;
+
+    IF l_name <> 'Aged Brie' AND l_name <> 'Backstage passes to a TAFKAL80ETC concert' THEN
+      IF l_quality > 0 THEN
+        IF l_name <> 'Sulfuras, Hand of Ragnaros' THEN
+          l_quality := l_quality - 1;
+        END IF;
+      END IF;
+    ELSE
+      IF (l_quality < 50) THEN
+        l_quality := l_quality + 1;
+        IF l_name = 'Backstage passes to a TAFKAL80ETC concert' THEN
+          IF l_sell_in < 11 THEN
+            IF l_quality < 50 THEN
+              l_quality := l_quality + 1;
+            END IF;
+          END IF;
+          IF l_sell_in < 6 THEN
+            IF l_quality < 50 THEN
+              l_quality := l_quality + 1;
+            END IF;
+          END IF;
+        END IF;
+      END IF;
+    END IF;
+
+    IF l_name <> 'Sulfuras, Hand of Ragnaros' THEN
+      l_sell_in := l_sell_in - 1;
+    END IF;
+
+    IF l_sell_in < 0 THEN
+      IF l_name <> 'Aged Brie' THEN
+        IF l_name <> 'Backstage passes to a TAFKAL80ETC concert' THEN
+          IF l_quality > 0 THEN
+            IF l_name <> 'Sulfuras, Hand of Ragnaros' THEN
+              l_quality := l_quality - 1;
+            END IF;
+          END IF;
+        ELSE
+          l_quality := l_quality - l_quality;
+        END IF;
+      ELSE
+        IF l_quality < 50 THEN
+          l_quality := l_quality + 1;
+        END IF;
+      END IF;
+    END IF;
+
+    UPDATE item
+      SET name = l_name, sell_in = l_sell_in, quality = l_quality WHERE CURRENT OF c_items;
+  END LOOP;
+  CLOSE c_items;
+END;
+$$;