diff --git a/src/utils/event.ts b/src/utils/event.ts
index 3944fc1..63be785 100644
--- a/src/utils/event.ts
+++ b/src/utils/event.ts
@@ -5,7 +5,7 @@ import { CanonicalEvent, Event } from '../@types/event'
 import { EventKinds, EventTags } from '../constants/base'
 import { fromBuffer } from './transform'
 import { isGenericTagQuery } from './filter'
-import { Rune } from './runes'
+import { RuneLike } from './runes/rune-like'
 import { SubscriptionFilter } from '../@types/subscription'
 
 export const serializeEvent = (event: Partial<Event>): CanonicalEvent => [
@@ -128,7 +128,7 @@ export const isDelegatedEventValid = async (event: Event): Promise<boolean> => {
 
   let result: boolean
   try {
-    [result] = Rune.from(delegation[2]).test(runifiedEvent)
+    [result] = RuneLike.from(delegation[2]).test(runifiedEvent)
   } catch (error) {
     result = false
   }
diff --git a/src/utils/runes.ts b/src/utils/runes/alternative.ts
similarity index 62%
rename from src/utils/runes.ts
rename to src/utils/runes/alternative.ts
index e83a16a..c45aaa4 100644
--- a/src/utils/runes.ts
+++ b/src/utils/runes/alternative.ts
@@ -125,91 +125,4 @@ export class Alternative {
   }
 }
 
-export class Restriction {
-  public constructor(
-    private readonly alternatives: Alternative[]
-  ) {
-    if (!alternatives.length) {
-      throw new Error('Restriction must have some alternatives')
-    }
-  }
 
-  public test(values: Record<string, any>): string | undefined {
-    const reasons: string[] = []
-    for (const alternative of this.alternatives) {
-      const reason = alternative.test(values)
-      if (typeof reason === 'undefined') {
-        return
-      }
-      reasons.push(reason)
-    }
-
-    return reasons.join(' AND ')
-  }
-
-  public encode(): string {
-    return this.alternatives.map((alternative) => alternative.encode()).join('|')
-  }
-
-  public static decode(encodedStr: string): [Restriction, string] {
-    let encStr = encodedStr
-    let alternative: Alternative
-    const alternatives: Alternative[] = []
-    while (encStr.length) {
-      if (encStr.startsWith('&')) {
-        encStr = encStr.slice(1)
-        break
-      }
-
-      [alternative, encStr] = Alternative.decode(encStr)
-
-      alternatives.push(alternative)
-    }
-
-    return [new Restriction(alternatives), encStr]
-  }
-
-  public static from(encodedStr: string): Restriction {
-    const [restriction, remainder] = Restriction.decode(encodedStr.replace(/\s+/g, ''))
-
-    if (remainder.length) {
-      throw new Error(`Restriction had extra characters at end: ${remainder}`)
-    }
-
-    return restriction
-  }
-}
-
-export class Rune {
-  public constructor(
-    private readonly restrictions: Restriction[] = []
-  ) { }
-
-  public test(values: Record<string, string | string[]>): [boolean, string] {
-    for (const restriction of this.restrictions) {
-      const reasons = restriction.test(values)
-      if (typeof reasons !== 'undefined') {
-        return [false, reasons]
-      }
-    }
-
-    return [true, '']
-  }
-
-  public encode() {
-    return this.restrictions.map((restriction) => restriction.encode()).join('&')
-  }
-
-  public static from(encodedStr: string): Rune {
-    const restrictions: Restriction[] = []
-    let restriction: Restriction
-    let encStr = encodedStr.replace(/\s+/g, '')
-
-    while (encStr.length) {
-      [restriction, encStr] = Restriction.decode(encStr)
-      restrictions.push(restriction)
-    }
-
-    return new Rune(restrictions)
-  }
-}
diff --git a/src/utils/runes/restriction.ts b/src/utils/runes/restriction.ts
new file mode 100644
index 0000000..5174cad
--- /dev/null
+++ b/src/utils/runes/restriction.ts
@@ -0,0 +1,47 @@
+import { Alternative } from './alternative'
+
+
+export class Restriction {
+  public constructor(
+    private readonly alternatives: Alternative[]
+  ) {
+    if (!alternatives.length) {
+      throw new Error('Restriction must have some alternatives')
+    }
+  }
+
+  public test(values: Record<string, any>): string | undefined {
+    const reasons: string[] = []
+    for (const alternative of this.alternatives) {
+      const reason = alternative.test(values)
+      if (typeof reason === 'undefined') {
+        return
+      }
+      reasons.push(reason)
+    }
+
+    return reasons.join(' AND ')
+  }
+
+  public encode(): string {
+    return this.alternatives.map((alternative) => alternative.encode()).join('|')
+  }
+
+  public static decode(encodedStr: string): [Restriction, string] {
+    let encStr = encodedStr
+    let alternative: Alternative
+    const alternatives: Alternative[] = []
+    while (encStr.length) {
+      if (encStr.startsWith('&')) {
+        encStr = encStr.slice(1)
+        break
+      }
+
+      [alternative, encStr] = Alternative.decode(encStr)
+
+      alternatives.push(alternative)
+    }
+
+    return [new Restriction(alternatives), encStr]
+  }
+}
diff --git a/src/utils/runes/rune-like.ts b/src/utils/runes/rune-like.ts
new file mode 100644
index 0000000..0ba98ef
--- /dev/null
+++ b/src/utils/runes/rune-like.ts
@@ -0,0 +1,36 @@
+import { Restriction } from './restriction'
+
+
+export class RuneLike {
+  public constructor(
+    private readonly restrictions: Restriction[] = []
+  ) { }
+
+  public test(values: Record<string, unknown>): [boolean, string] {
+    for (const restriction of this.restrictions) {
+      const reasons = restriction.test(values)
+      if (typeof reasons !== 'undefined') {
+        return [false, reasons]
+      }
+    }
+
+    return [true, '']
+  }
+
+  public encode() {
+    return this.restrictions.map((restriction) => restriction.encode()).join('&')
+  }
+
+  public static from(encodedStr: string): RuneLike {
+    const restrictions: Restriction[] = []
+    let restriction: Restriction
+    let encStr = encodedStr.replace(/\s+/g, '')
+
+    while (encStr.length) {
+      [restriction, encStr] = Restriction.decode(encStr)
+      restrictions.push(restriction)
+    }
+
+    return new RuneLike(restrictions)
+  }
+}
diff --git a/test/unit/utils/runes.spec.ts b/test/unit/utils/runes/alternative.spec.ts
similarity index 99%
rename from test/unit/utils/runes.spec.ts
rename to test/unit/utils/runes/alternative.spec.ts
index 5f5f2a5..54c3b22 100644
--- a/test/unit/utils/runes.spec.ts
+++ b/test/unit/utils/runes/alternative.spec.ts
@@ -1,7 +1,7 @@
 import { expect } from 'chai'
 import sinon from 'sinon'
 
-import { Alternative } from '../../../src/utils/runes'
+import { Alternative } from '../../../../src/utils/runes/alternative'
 
 describe('Alternative', () => {
   describe('constructor', () => {
diff --git a/test/unit/utils/runes/restriction.spec.ts b/test/unit/utils/runes/restriction.spec.ts
new file mode 100644
index 0000000..5a6982e
--- /dev/null
+++ b/test/unit/utils/runes/restriction.spec.ts
@@ -0,0 +1,132 @@
+import { expect } from 'chai'
+import sinon from 'sinon'
+
+import { Alternative } from '../../../../src/utils/runes/alternative'
+import { Restriction } from '../../../../src/utils/runes/restriction'
+
+describe('Restriction', () => {
+  describe('constructor', () => {
+    it('throws if given alternatives list is empty', () => {
+      expect(() => new Restriction([])).to.throw(Error, 'Restriction must have some alternatives')
+    })
+  })
+
+  describe('test', () => {
+    it('returns undefined given 1 true alternative', () => {
+      const values = { a: 1 }
+      const alternatives: Alternative[] = [
+        { test: sinon.fake.returns(undefined) },
+      ] as any
+
+      expect(new Restriction(alternatives).test(values)).to.be.undefined
+
+      expect(alternatives[0].test).to.have.been.calledOnceWithExactly(values)
+    })
+
+    it('returns undefined given 2 true alternative', () => {
+      const values = { a: 1 }
+      const alternatives: Alternative[] = [
+        { test: sinon.fake.returns(undefined) },
+        { test: sinon.fake.returns(undefined) },
+      ] as any
+
+      expect(new Restriction(alternatives).test(values)).to.be.undefined
+
+      expect(alternatives[0].test).to.have.been.calledOnceWithExactly(values)
+      expect(alternatives[1].test).not.to.have.been.called
+    })
+
+    it('returns undefined given 1 true and 1 false alternative', () => {
+      const values = { a: 1 }
+      const alternatives: Alternative[] = [
+        { test: sinon.fake.returns(undefined) },
+        { test: sinon.fake.returns('reason') },
+      ] as any
+
+      expect(new Restriction(alternatives).test(values)).to.be.undefined
+
+      expect(alternatives[0].test).to.have.been.calledOnceWithExactly(values)
+      expect(alternatives[1].test).not.to.have.been.called
+    })
+
+    it('returns reason given 1 false alternative', () => {
+      const values = { a: 1 }
+      const alternatives: Alternative[] = [
+        { test: sinon.fake.returns('reason') },
+      ] as any
+
+      expect(new Restriction(alternatives).test(values)).to.equal('reason')
+
+      expect(alternatives[0].test).to.have.been.calledOnceWithExactly(values)
+    })
+
+    it('returns undefined given 1 false and 1 true alternative', () => {
+      const values = { a: 1 }
+      const alternatives: Alternative[] = [
+        { test: sinon.fake.returns('reason') },
+        { test: sinon.fake.returns(undefined) },
+      ] as any
+
+      expect(new Restriction(alternatives).test(values)).to.be.undefined
+
+      expect(alternatives[0].test).to.have.been.calledOnceWithExactly(values)
+      expect(alternatives[1].test).to.have.been.calledOnceWithExactly(values)
+    })
+
+    it('returns reasons given 2 false alternatives', () => {
+      const values = { a: 1 }
+      const alternatives: Alternative[] = [
+        { test: sinon.fake.returns('reason 1') },
+        { test: sinon.fake.returns('reason 2') },
+      ] as any
+
+      expect(new Restriction(alternatives).test(values)).to.equal('reason 1 AND reason 2')
+
+      expect(alternatives[0].test).to.have.been.calledOnceWithExactly(values)
+      expect(alternatives[1].test).to.have.been.calledOnceWithExactly(values)
+    })
+  })
+
+  describe('encode', () => {
+    it('returns encoded restriction with 1 alternative', () => {
+      const alternatives: Alternative[] = [
+        { encode: sinon.fake.returns('a=1') },
+      ] as any
+
+      expect(new Restriction(alternatives).encode()).to.equal('a=1')
+    })
+
+
+    it('returns encoded restrictions with 2 alternatives', () => {
+      const alternatives: Alternative[] = [
+        { encode: sinon.fake.returns('a=1') },
+        { encode: sinon.fake.returns('b=2') },
+      ] as any
+
+      expect(new Restriction(alternatives).encode()).to.equal('a=1|b=2')
+    })
+  })
+
+  describe('decode', () => {
+    it('returns encoded restriction given 1 alternative', () => {
+      const [restriction, remainder] = Restriction.decode('a=1')
+
+      expect(restriction.encode()).to.equal('a=1')
+      expect(remainder).to.be.empty
+    })
+
+    it('returns encoded restriction given 2 alternatives', () => {
+      const [restriction, remainder] = Restriction.decode('a=1|b=2')
+
+      expect(restriction.encode()).to.equal('a=1|b=2')
+      expect(remainder).to.be.empty
+    })
+
+    it('returns encoded restriction given 2 alternatives and another restriction', () => {
+      const [restriction, remainder] = Restriction.decode('a=1|b=2&c=1')
+
+      expect(restriction.encode()).to.equal('a=1|b=2')
+      expect(remainder).to.equal('c=1')
+    })
+  })
+})
diff --git a/test/unit/utils/runes/rune-like.spec.ts b/test/unit/utils/runes/rune-like.spec.ts
new file mode 100644
index 0000000..2c1dc83
--- /dev/null
+++ b/test/unit/utils/runes/rune-like.spec.ts
@@ -0,0 +1,173 @@
+import { expect } from 'chai'
+import sinon from 'sinon'
+
+import { Alternative } from '../../../../src/utils/runes/alternative'
+import { Restriction } from '../../../../src/utils/runes/restriction'
+import { RuneLike } from '../../../../src/utils/runes/rune-like'
+
+describe('RuneLike', () => {
+  describe('test', () => {
+    it('returns true if 1 restriction is true', () => {
+      const values = { a: 1 }
+      const restrictions: Restriction[] = [
+        { test: sinon.fake.returns(undefined) } as any,
+      ]
+
+      expect(new RuneLike(restrictions).test(values)).to.deep.equal([true, ''])
+      expect(restrictions[0].test).to.have.been.calledOnceWithExactly(values)
+    })
+
+    it('returns false and reason if 1 restriction is false', () => {
+      const values = { a: 1 }
+      const restrictions: Restriction[] = [
+        { test: sinon.fake.returns('reason') } as any,
+      ]
+
+      expect(new RuneLike(restrictions).test(values)).to.deep.equal([false, 'reason'])
+      expect(restrictions[0].test).to.have.been.calledOnceWithExactly(values)
+    })
+
+    it('returns false if 1 restriction is true and 1 is false', () => {
+      const values = { a: 1 }
+      const restrictions: Restriction[] = [
+        { test: sinon.fake.returns(undefined) } as any,
+        { test: sinon.fake.returns('reason 2') } as any,
+      ]
+
+      expect(new RuneLike(restrictions).test(values)).to.deep.equal([false, 'reason 2'])
+      expect(restrictions[0].test).to.have.been.calledOnceWithExactly(values)
+      expect(restrictions[1].test).to.have.been.calledOnceWithExactly(values)
+    })
+
+    it('returns false if 1 restriction is false and 1 is true', () => {
+      const values = { a: 1 }
+      const restrictions: Restriction[] = [
+        { test: sinon.fake.returns('reason 1') } as any,
+        { test: sinon.fake.returns(undefined) } as any,
+      ]
+
+      expect(new RuneLike(restrictions).test(values)).to.deep.equal([false, 'reason 1'])
+      expect(restrictions[0].test).to.have.been.calledOnceWithExactly(values)
+      expect(restrictions[1].test).not.to.have.been.called
+    })
+
+    it('returns false if 2 restrictions are false', () => {
+      const values = { a: 1 }
+      const restrictions: Restriction[] = [
+        { test: sinon.fake.returns('reason 1') } as any,
+        { test: sinon.fake.returns('reason 2') } as any,
+      ]
+
+      expect(new RuneLike(restrictions).test(values)).to.deep.equal([false, 'reason 1'])
+      expect(restrictions[0].test).to.have.been.calledOnceWithExactly(values)
+      expect(restrictions[1].test).not.to.have.been.called
+    })
+  })
+
+  describe('encode', () => {
+    it('encodes 1 restriction', () => {
+      const restrictions: Restriction[] = [
+        { encode: sinon.fake.returns('a=1') },
+      ] as any
+
+      expect(new RuneLike(restrictions).encode()).to.equal('a=1')
+    })
+
+    it('encodes 2 restrictions', () => {
+      const restrictions: Restriction[] = [
+        { encode: sinon.fake.returns('a=1') },
+        { encode: sinon.fake.returns('b=2') },
+      ] as any
+
+      expect(new RuneLike(restrictions).encode()).to.equal('a=1&b=2')
+    })
+  })
+
+  describe('from', () => {
+    let restrictionDecodeStub: sinon.SinonStub
+    beforeEach(() => {
+      restrictionDecodeStub = sinon.stub(Restriction, 'decode')
+    })
+
+    afterEach(() => {
+      restrictionDecodeStub.restore()
+    })
+
+    it('returns rune-like given restrictions a=1', () => {
+      restrictionDecodeStub.withArgs('a=1').returns([
+        new Restriction([
+          new Alternative('a', '=', '1'),
+        ]),
+        '',
+      ])
+      const runeLike = RuneLike.from('a=1')
+
+      expect(runeLike).to.be.an.instanceOf(RuneLike)
+
+      expect(restrictionDecodeStub.firstCall).to.have.been.calledWithExactly('a=1')
+      expect(runeLike.encode()).to.equal('a=1')
+    })
+
+    it('returns rune-like given restrictions a=1|b=2', () => {
+      restrictionDecodeStub.withArgs('a=1|b=2').returns([
+        new Restriction([
+          new Alternative('a', '=', '1'),
+          new Alternative('b', '=', '2'),
+        ]),
+        '',
+      ])
+      const runeLike = RuneLike.from('a=1|b=2')
+
+      expect(runeLike).to.be.an.instanceOf(RuneLike)
+
+      expect(restrictionDecodeStub.firstCall).to.have.been.calledWithExactly('a=1|b=2')
+      expect(runeLike.encode()).to.equal('a=1|b=2')
+    })
+
+    it('returns rune-like given restrictions a=1|b=2&c=3', () => {
+      restrictionDecodeStub.withArgs('a=1|b=2&c=3').returns([
+        new Restriction([
+          new Alternative('a', '=', '1'),
+          new Alternative('b', '=', '2'),
+        ]),
+        '&c=3',
+      ])
+      restrictionDecodeStub.withArgs('&c=3').returns([
+        new Restriction([
+          new Alternative('c', '=', '3'),
+        ]),
+        '',
+      ])
+      const runeLike = RuneLike.from('a=1|b=2&c=3')
+
+      expect(runeLike).to.be.an.instanceOf(RuneLike)
+
+      expect(restrictionDecodeStub.firstCall).to.have.been.calledWithExactly('a=1|b=2&c=3')
+      expect(restrictionDecodeStub.secondCall).to.have.been.calledWithExactly('&c=3')
+      expect(runeLike.encode()).to.equal('a=1|b=2&c=3')
+    })
+
+    it('returns rune-like given restrictions with spaces a = 1 | b = 2 & c = 3', () => {
+      restrictionDecodeStub.withArgs('a=1|b=2&c=3').returns([
+        new Restriction([
+          new Alternative('a', '=', '1'),
+          new Alternative('b', '=', '2'),
+        ]),
+        '&c=3',
+      ])
+      restrictionDecodeStub.withArgs('&c=3').returns([
+        new Restriction([
+          new Alternative('c', '=', '3'),
+        ]),
+        '',
+      ])
+      const runeLike = RuneLike.from('a = 1 | b = 2 & c = 3')
+
+      expect(runeLike).to.be.an.instanceOf(RuneLike)
+
+      expect(restrictionDecodeStub.firstCall).to.have.been.calledWithExactly('a=1|b=2&c=3')
+      expect(restrictionDecodeStub.secondCall).to.have.been.calledWithExactly('&c=3')
+      expect(runeLike.encode()).to.equal('a=1|b=2&c=3')
+    })
+  })
+})